WO2012046281A1 - Station-side device - Google Patents

Station-side device Download PDF

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Publication number
WO2012046281A1
WO2012046281A1 PCT/JP2010/006035 JP2010006035W WO2012046281A1 WO 2012046281 A1 WO2012046281 A1 WO 2012046281A1 JP 2010006035 W JP2010006035 W JP 2010006035W WO 2012046281 A1 WO2012046281 A1 WO 2012046281A1
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WO
WIPO (PCT)
Prior art keywords
gain
frame
circuit
subscriber
control unit
Prior art date
Application number
PCT/JP2010/006035
Other languages
French (fr)
Japanese (ja)
Inventor
彰展 野原
隆志 西谷
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2012537495A priority Critical patent/JP5323267B2/en
Priority to PCT/JP2010/006035 priority patent/WO2012046281A1/en
Publication of WO2012046281A1 publication Critical patent/WO2012046281A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/693—Arrangements for optimizing the preamplifier in the receiver
    • H04B10/6931—Automatic gain control of the preamplifier

Definitions

  • the present invention relates to a station-side device that improves upstream transmission efficiency in a station-side device (OLT: Optical Line Terminal) that communicates with a plurality of subscriber-side devices (ONU: Optical Network Unit). .
  • OLT Optical Line Terminal
  • ONU Optical Network Unit
  • the FTTH service is a home data communication service using optical fibers.
  • a plurality of subscriber-side devices are connected to one station-side device by optical fibers and optical couplers, and data is transmitted and received between the station-side device and each subscriber-side device. ing.
  • the transmission direction for transmitting data from the station side device to the subscriber side device is defined as downlink, and the transmission direction for transmitting data from the subscriber side device to the station side device is defined as uplink.
  • downstream data transmission is a continuous transmission system
  • upstream data transmission is a burst transmission system.
  • the burst transmission method is a transmission method in which signals on a physical medium are sent as one unit (burst).
  • data from a plurality of subscriber side devices is time-division multiplexed and transmitted to the station side device. Therefore, increasing uplink transmission efficiency is important in realizing high-speed communication.
  • JP 2008-199233 A Japanese Patent Application Laid-Open No. 2007-116587
  • the AGC period is shortened by measuring the RTT to the station side apparatus and the subscriber side apparatus and the light intensity input to the station side apparatus.
  • the AGC period cannot be deleted.
  • Patent Document 2 reduces SyncTime by connecting a plurality of data frames when a plurality of LLIDs are provided in one subscriber side device. Therefore, there has been a problem that it is not possible to apply uplink data transmission efficiency when one subscriber-side device has one LLID.
  • the present invention has been made to solve the above-described problems, and provides a station-side apparatus that can reduce SyncTime by deleting an AGC period and can improve uplink bandwidth utilization efficiency.
  • the purpose is that.
  • the station-side device includes an AGC circuit that performs GAIN adjustment on data received from each subscriber-side device, a GAIN holding unit that holds a GAIN amount used in GAIN adjustment by the AGC circuit, and each subscription
  • the GAIN circuit that performs GAIN adjustment using the GAIN amount held in the GAIN holding unit for the data received from the subscriber side device, and the AGC circuit as the transmission path of the data received from each subscriber side device
  • a selector for selecting a transmission path that passes through the GAIN circuit.
  • FIG. 1 is a block diagram showing a configuration of a PON system according to Embodiment 1.
  • FIG. 2 is a block diagram illustrating a configuration of each unit in the PON system according to the first embodiment.
  • FIG. 3 is a sequence diagram showing an operation of the PON system according to the first embodiment.
  • 6 is a diagram illustrating a configuration of a Register frame in which phase information is embedded in Embodiment 1.
  • FIG. 3 is a diagram illustrating a configuration of an uplink burst frame in Embodiment 1.
  • FIG. FIG. 6 is a block diagram illustrating a configuration of each unit in a PON system according to Embodiment 2.
  • FIG. 10 is a sequence diagram showing an operation of the PON system according to the second embodiment. It is a figure which shows the structure of the Gate frame which embedded the phase information in Embodiment 2.
  • FIG. FIG. 10 is a block diagram illustrating another configuration of each unit in the PON system according to the second embodiment.
  • FIG. 1 is a diagram showing a PON system according to Embodiment 1 of the present invention
  • FIG. 2 is a block diagram showing the configuration of each part.
  • the PON system includes a station-side device (OLT) 1 installed on the station side and subscriber-side devices (ONU) 2-1 to 2 installed on a plurality of premises. -N (hereinafter referred to as subscriber-side device 2).
  • the station-side device 1 and the plurality of subscriber-side devices 2 are connected via an optical fiber 3, an optical splitter 4, and optical fibers 5-1 to 5-n (hereinafter referred to as optical fiber 5).
  • the station side device 1 is connected to the host device 6 and transmits and receives the upper and lower data.
  • the subscriber side device 2 is connected to the lower level device 7 and transmits and receives upper and lower data. Note that the transmission direction from the higher level device 6 to the lower level device 7 is defined as downlink, and the transmission direction from the lower level device 7 to the higher level device 6 is defined as uplink.
  • the station apparatus 1 includes a WDM (Wavelength Division Multiplexing) coupler 101, an optical receiving unit 102, a bandwidth allocation control unit 103, a power supply control unit 104, a phase control unit 105, a frame separation unit 106, a frame control unit 107, and a downlink buffer unit 108.
  • the frame multiplexer 109 and the optical transmitter 110 are provided.
  • the WDM coupler 101 transmits uplink data from each subscriber side device 2 to the optical receiving unit 102 via the optical splitter 4, and downlink data from the optical transmission unit 110 via the optical splitter 4 to each subscriber side device. 2 is transmitted.
  • the optical receiver 102 receives uplink data from each subscriber side device 2 via the WDM coupler 101.
  • the optical receiving unit 102 includes an O / E (Optical / Electrical) converter 111, selectors 112 and 113, an intensity adjusting unit 114, and a phase adjusting unit 115.
  • O / E Optical / Electrical
  • the O / E converter 111 converts the uplink data (burst optical signal) received from each subscriber apparatus 2 via the WDM coupler 101 into an electric signal. Data converted into an electrical signal by the O / E converter 111 is transmitted to the selector 112.
  • the selectors 112 and 113 switch the transmission paths in the intensity adjusting unit 114 and the phase adjusting unit 115 based on the communication cycle with each subscriber apparatus 2 notified from the band allocation control unit 103.
  • the selectors 112 and 113 change the first transmission path (AGC circuit 116 and CDR circuit 119 described later) in FIG. (Transmission path that passes through) is selected, and in the case of a period other than the initial period, the second transmission path (transmission path that passes through the GAIN circuit 118) is selected.
  • the intensity adjustment unit 114 performs GAIN adjustment on data received from the O / E converter 111 via the selector 112.
  • the intensity adjusting unit 114 includes an AGC circuit 116, a GAIN holding unit 117, and a GAIN circuit 118.
  • the AGC circuit 116 performs GAIN adjustment on the data received from the O / E converter 111 via the selector 112.
  • the data subjected to GAIN adjustment by the AGC circuit 116 is transmitted to the phase adjustment unit 115. Further, the GAIN information indicating the GAIN amount used for the data of each subscriber side device 2 is transmitted to the GAIN holding unit 117 by the AGC circuit 116.
  • the GAIN holding unit 117 holds GAIN information for each subscriber side device 2 received from the AGC circuit 116.
  • the GAIN information held in the GAIN holding unit 117 is extracted by the GAIN circuit 118.
  • the GAIN circuit 118 extracts the corresponding GAIN amount from the GAIN holding unit 117 based on the data transmission start time and duration of each subscriber side device 2 notified from the band allocation control unit 103, and uses this GAIN amount.
  • GAIN adjustment is performed on the data received from the O / E converter 111 via the selector 112.
  • the data subjected to the GAIN adjustment by the GAIN circuit 118 is transmitted to the frame separation unit 106 via the selector 113.
  • the phase adjustment unit 115 adjusts the phase of the data received from the intensity adjustment unit 114.
  • the phase adjustment unit 115 includes a CDR circuit 119.
  • the CDR circuit 119 performs phase adjustment on the data received from the intensity adjustment unit 114.
  • the data whose phase is adjusted by the CDR circuit 119 is transmitted to the frame separation unit 106 via the selector 113.
  • the CDR circuit 119 transmits phase information indicating the phase adjustment amount used for the data of each subscriber side device to the phase control unit 105.
  • the bandwidth allocation control unit 103 determines the data transmission start time and duration of each subscriber side device 2 in the next cycle, and notifies each block (GAIN holding unit 117 and frame control unit 107). In addition, the bandwidth allocation control unit 103 notifies the Discovery Window information to each block (the selectors 112 and 113 and the power control unit 104).
  • This Discovery Window information is information (information necessary to establish a PON link) exchanged in Discovery Window (period in which the unregistered subscriber side device 2 makes a registration request to the station side device 1).
  • This Discovery Window information includes information indicating whether the communication cycle with the subscriber apparatus 2 is the first discovery cycle.
  • the discovery period is a generation period of Discovery Window.
  • the power supply control unit 104 uses unused blocks (AGC circuits 116, 116) on the transmission path not selected by the selectors 112 and 113.
  • the power of the CDR circuit 119 or the GAIN circuit 118) is turned off.
  • the phase control unit 105 holds the phase information for each subscriber side device 2 received from the CDR circuit 119.
  • the phase information held in the phase control unit 105 is extracted by the frame control unit 107.
  • the frame separation unit 106 separates the data received from the selector 113 into a User frame (received data) and a control frame (Register Request frame, Register Ack frame or Report frame).
  • the User frame separated by the frame separation unit 106 is transmitted to the host device 6, and the control frame is transmitted to the frame control unit 107.
  • the frame control unit 107 When the frame control unit 107 recognizes the control frame from the frame separation unit 106, the frame control unit 107 controls the control frame (Discovery Gate frame, Register frame, or Gate frame) based on information from the band allocation control unit 103 and the phase control unit 105. Alternatively, a phase information notification frame including phase information is generated. The phase information notification frame is configured to be embedded in an empty area of the Register frame. The control frame generated by the frame control unit 107 is transmitted to the frame multiplexing unit 109.
  • the control frame Discovery Gate frame, Register frame, or Gate frame
  • the downlink buffer unit 108 temporarily accumulates downlink data received from the host device 6.
  • the downlink data (User frame) stored in the downlink buffer unit 108 is read by the frame multiplexing unit 109.
  • the frame multiplexing unit 109 multiplexes the User frame (received data) read from the downlink buffer unit 108 and the control frame (Discovery Gate frame, Register frame, or Gate frame) from the frame control unit 107.
  • the frame multiplexed by the frame multiplexing unit 109 is transmitted to the optical transmission unit 110.
  • the optical transmission unit 110 converts a frame (electric signal) from the frame multiplexing unit 109 into an optical signal.
  • the frame (downlink data) converted into an optical signal by the optical transmission unit 110 is transmitted to the WDM coupler 101.
  • the subscriber-side device 2 includes a WDM coupler 201, an optical receiving unit 202, a frame separation unit 203, a frame control unit 204, an uplink buffer unit 205, a frame multiplexing unit 206, a phase control unit 207, and an optical transmission unit 208. Yes.
  • the WDM coupler 201 transmits downlink data from the station side device 1 to the optical receiving unit 202 via the optical splitter 4, and transmits uplink data from the optical transmission unit 208 to the station side device 1 via the optical splitter 4. Is.
  • the optical receiving unit 202 receives downlink data (optical signal) from the station side device 1 via the WDM coupler 201 and converts it into an electrical signal.
  • the data converted into an electrical signal by the optical receiver 202 is transmitted to the frame separator 203.
  • the frame separation unit 203 separates the data received from the optical reception unit 202 into a User frame (reception data) and a control frame (Discovery Gate frame, Register frame or Gate frame).
  • the User frame separated by the frame separation unit 203 is transmitted to the lower apparatus 7, and the control frame is transmitted to the frame control unit 204.
  • the frame control unit 204 processes the control frame (all frames other than the User frame) from the frame separation unit 203.
  • the frame control unit 204 extracts a phase information notification frame from the Register frame and transmits the phase information to the phase control unit 207.
  • the upstream buffer unit 205 temporarily stores upstream data received from the lower device 7.
  • the uplink data (User frame) stored in the uplink buffer unit 205 is read by the frame multiplexing unit 206.
  • the frame multiplexing unit 206 multiplexes the User frame (received data) read from the uplink buffer unit 205 and the control frame (Register Request frame, Register Ack frame or Report frame) from the frame control unit 204.
  • the frame multiplexed by the frame multiplexing unit 206 is transmitted to the optical transmission unit 208.
  • the phase control unit 207 performs phase adjustment on the frame transmitted to the optical transmission unit 208 using the phase information from the frame control unit 204.
  • the optical transmission unit 208 converts the frame (electric signal) multiplexed by the frame multiplexing unit 206 and adjusted in phase by the phase control unit 207 into an optical signal.
  • the frame (uplink data) converted into an optical signal by the optical transmission unit 208 is transmitted to the WDM coupler 201.
  • FIG. 3 is a sequence diagram showing the operation of the PON system according to Embodiment 1 of the present invention.
  • MPCP Multi-Point Control Protocol
  • the station side device 1 transmits the Discovery Gate frame 11 to the unregistered subscriber side device 2 (step ST31).
  • the Discovery Gate frame 11 is a frame for notifying the registration request period from the station side device 1 to the unregistered subscriber side device 2.
  • the frame control unit 107 generates the Discovery Gate frame 11 for the unregistered subscriber side device 2.
  • the frame multiplexing unit 109 multiplexes the Discovery Gate frame 11 from the frame control unit 107 and the User frame from the downlink buffer unit 108.
  • the optical transmission unit 110 converts the frame multiplexed by the frame multiplexing unit 109 into an optical signal, and transmits the optical signal to the unregistered subscriber side device 2 via the WDM coupler 101 and the optical splitter 4.
  • the Subscriber side device 2 transmits a Register Request frame 12 to the station side device 1 (step ST32).
  • the Register Request frame 12 is a frame in which the subscriber side apparatus 2 makes a registration request.
  • the optical receiving unit 202 receives downlink data from the station side device 1 via the WDM coupler 201 and converts it into an electrical signal.
  • the frame separation unit 203 separates the data converted into the electrical signal by the optical reception unit 202 into the User frame and the Discovery Gate frame 11.
  • the frame control unit 204 recognizes the Discovery Gate frame 11 separated by the frame separation unit 203, and then generates a Register Request frame 12.
  • the frame multiplexing unit 206 multiplexes the Register Request frame 12 from the frame control unit 204 and the User frame from the uplink buffer unit 205.
  • the optical transmission unit 208 converts the frame multiplexed by the frame multiplexing unit 206 into an optical signal, and transmits the optical signal to the station side device 1 via the WDM coupler 201 and the optical splitter 4.
  • the station apparatus 1 performs GAIN adjustment and phase adjustment, and acquires GAIN information and phase information (step ST33).
  • the O / E converter 111 receives the uplink data from the subscriber side device 2 via the WDM coupler 101 and converts it into an electrical signal.
  • the selectors 112 and 113 determine that it is the first discovery cycle based on the Discovery Window information from the bandwidth allocation control unit 103, and switch to the first transmission path.
  • the power control unit 104 turns off the power of the unused block (GAIN circuit 118) based on the Discovery Window information from the band allocation control unit 103 to save energy.
  • the AGC circuit 116 performs GAIN adjustment on the data from the O / E converter 111.
  • the GAIN information by the AGC circuit 116 is held in the GAIN holding unit 117.
  • the CDR circuit 119 performs phase adjustment on the data that has been GAIN adjusted by the AGC circuit 116.
  • the phase information by the CDR circuit 119 is held in the phase control unit 105.
  • the frame separation unit 106 separates the data received from the CDR circuit 119 via the selector 113 into the User frame and the Register Request frame 12.
  • the User frame separated by the frame separation unit 106 is transmitted to the host device 6, and the Register Request frame 12 is transmitted to the frame control unit 107.
  • the station side apparatus 1 transmits the Register frame 13 and the Gate frame 14 to the subscriber side apparatus 2 (steps ST34 and 35).
  • the Register frame 13 is a frame in which an LLID for assigning an ID to the subscriber side device 2 is stored.
  • the Gate frame 14 is a frame for notifying the subscriber side device 2 of the data transmission start time and duration.
  • the bandwidth allocation control unit 103 determines the data transmission start time and duration of each subscriber side device 2 in the next cycle, and notifies the GAIN holding unit 117 and the frame control unit 107 of the data transmission start time and duration. .
  • the Discovery Window information in the next cycle is notified to the selectors 112 and 113 and the power supply control unit 104.
  • the frame control unit 107 recognizes the Register Request frame 12 and then generates the Register frame 13. Further, the Gate frame 14 is generated based on the data transmission start time and duration of each subscriber-side device 2 in the next period notified from the bandwidth allocation control unit 103. At this time, the frame control unit 107 also generates a phase information notification frame in which the phase information extracted from the phase control unit 105 is embedded in an empty area of the Register frame 13. For example, as shown in FIG. 4, a phase information notification frame is generated by embedding 1 byte in the pad / reserved band of the register frame 13.
  • the frame multiplexing unit 109 multiplexes the Register frame 13 and the Gate frame 14 in which the position information notification frame is embedded from the frame control unit 107 and the User frame from the downlink buffer unit 108.
  • the optical transmission unit 110 converts the frame multiplexed by the frame multiplexing unit 109 into an optical signal, and transmits the optical signal to the corresponding subscriber side device 2 via the WDM coupler 101 and the optical splitter 4.
  • the Register Ack frame 15 is a frame in which the subscriber side device 2 notifies the station side device 1 of the completion of registration.
  • the optical receiving unit 202 receives downlink data from the station side device 1 via the WDM coupler 201 and converts it into an electrical signal.
  • the frame separation unit 203 separates the data converted into the electrical signal by the optical reception unit 202 into the Register frame 13 and the Gate frame 14 in which the User frame and the position information notification frame are embedded.
  • the frame control unit 204 recognizes the Gate frame 14 separated by the frame separation unit 203 and then generates a Register Ack frame 15.
  • the frame control unit 204 extracts a phase information notification frame from the Register frame 13 and transmits the phase information to the phase control unit 207.
  • the frame multiplexing unit 206 multiplexes the Register Ack frame 15 from the frame control unit 204 and the User frame from the uplink buffer unit 205.
  • the phase control unit 207 performs phase adjustment on the frame transmitted to the optical transmission unit 208 using the phase information from the frame control unit 204.
  • the optical transmission unit 208 converts the frame multiplexed by the frame multiplexing unit 206 and phase-adjusted by the phase control unit 207 into an optical signal, and transmits the optical signal to the station-side apparatus 1 via the WDM coupler 201 and the optical splitter 4. To do.
  • the station side apparatus 1 performs GAIN adjustment (step ST38).
  • the O / E converter 111 receives the uplink data from the subscriber side device 2 via the WDM coupler 101 and converts it into an electrical signal.
  • the selectors 112 and 113 determine that it is not the first discovery cycle based on the Discovery Window information from the bandwidth allocation control unit 103, and switch to the second transmission path.
  • the power supply control unit 104 turns off the power of unused blocks (AGC circuit 116 and CDR circuit 119) based on the Discovery Window information from the band allocation control unit 103 to save energy.
  • the GAIN circuit 118 extracts the corresponding GAIN amount from the GAIN holding unit 117 based on the data transmission start time and duration of each subscriber side device 2 notified from the band allocation control unit 103, and this GAIN The GAIN adjustment is performed on the data from the O / E converter 111 using the amount.
  • the frame separation unit 106 separates the data received from the GAIN circuit 118 via the selector 113 into the User frame and the Register Ack frame 15. The User frame separated by the frame separation unit 106 is transmitted to the host device 6, and the Register Ack frame 15 is transmitted to the frame control unit 107.
  • the frame control unit 107 recognizes the Register Ack frame 15, generates a Gate frame, and then becomes a Gate-Report sequence. In the light intensity adjustment and the phase adjustment in the Gate-Report sequence, the GAIN amount and the phase adjustment amount extracted in the first discovery cycle are reflected.
  • a phase adjustment (CDR) ) Period 22 data transmission (Data) period 23, and laser falling (Loff: Laser Off) period 24.
  • the AGC period 21 and the CDR period 22 are a synchronization period (SyncTime) 25, and data cannot be transmitted within the SyncTime 25.
  • the light intensity adjustment by the AGC circuit and the phase adjustment by the CDR circuit need to be performed every cycle, and the SyncTime 25 needs to be provided every cycle. Efficiency will be low.
  • the light intensity adjustment by the AGC circuit 116 and the phase adjustment by the CDR circuit 119 are performed only in the first discovery cycle, and thereafter extraction is performed. The GAIN amount and phase adjustment amount are reflected. For this reason, the SyncTime 25 after the first discovery cycle can be deleted, and the data transmission amount can be increased, so that the utilization efficiency of the upstream band can be improved.
  • the phase information notification frame is embedded in the free area of the Register frame 13.
  • the present invention is not limited to this, and the phase information notification frame is embedded in the free area of the Gate frame 14.
  • the phase information notification frame may be configured as a frame of another format.
  • the light intensity adjustment by the AGC circuit 116 and the phase adjustment by the CDR circuit 119 are performed only in the first discovery cycle.
  • the present invention is not limited to this.
  • the discovery cycle The light intensity adjustment by the AGC circuit 116 and the phase adjustment by the CDR circuit 119 may be performed at predetermined intervals such as every time. Thereby, more stable synchronization can be realized.
  • Embodiment 2 FIG. In the first embodiment, the GAIN amount and the phase control amount extracted in the first discovery cycle are used to perform the subsequent GAIN adjustment and phase adjustment. In the second embodiment, the GAIN amount and the phase control amount are used. A method for updating the period is described.
  • FIG. 6 is a block diagram showing the configuration of each part in the PON system according to the second embodiment.
  • the GAIN holding unit 117 is deleted from the intensity adjusting unit 114 in the first embodiment shown in FIG. 2, and the light intensity monitor 120 and the GAIN control unit (GAIN holding unit) 121 are deleted. Is added.
  • Other configurations are the same, and the same reference numerals are given and description thereof is omitted.
  • the light intensity monitor 120 calculates the GAIN amount required for the GAIN adjustment based on data received from the O / E converter 111 via the selector 112.
  • the light intensity monitor 120 transmits GAIN information indicating the GAIN amount calculated based on the data of each subscriber side device 2 to the GAIN control unit 121.
  • the data input to the light intensity monitor 120 is transmitted to the GAIN circuit 118 as it is.
  • the GAIN control unit 121 holds GAIN information for each subscriber-side device 2 received from the AGC circuit 116 or the light intensity monitor 120.
  • the GAIN information held in the GAIN control unit 121 is extracted by the GAIN circuit 118.
  • the selectors 112 and 113 select the first transmission path (transmission path that passes through the AGC circuit 116 and the CDR circuit 119) in FIG. 6 when the communication period with the subscriber side apparatus 2 is the first discovery period.
  • a second transmission path (a path that passes through the light intensity monitor 120 and the GAIN circuit 118, passes through the CDR circuit 119 and terminates, and a path that does not pass through the CDR circuit 119) Select the transmission route that branches to.
  • the GAIN circuit 118 uses the GAIN amount of the previous cycle extracted from the GAIN control unit 121 for the current cycle data received from the O / E converter 111 via the selector 112 and the light intensity monitor 120 to perform the GAIN. Make adjustments.
  • the data subjected to GAIN adjustment by the GAIN circuit 118 is branched into two, one being transmitted to the CDR circuit 119 and the other being transmitted to the frame separation unit 106 via the selector 113.
  • the CDR circuit 119 performs phase adjustment on the data received from the AGC circuit 116 or the GAIN circuit 118. Note that the data from the AGC circuit 116 is transmitted to the frame separation unit 106 via the selector 113 after phase adjustment. On the other hand, the data from the GAIN circuit 118 is terminated after the phase adjustment.
  • FIG. 7 is a sequence diagram showing the operation of the PON system according to Embodiment 2 of the present invention.
  • a case where an MPCP Discovery sequence is used as a method for performing phase synchronization will be described.
  • the operations of steps ST71 and 72 of the PON system according to Embodiment 2 shown in FIG. 7 are the same as the operations of Steps ST31 and 32 of the PON system according to Embodiment 1 shown in FIG. Omitted.
  • step ST73 the station apparatus 1 performs GAIN adjustment and phase adjustment, and acquires GAIN information and phase information.
  • the O / E converter 111 receives the uplink data from the subscriber side apparatus 2 via the WDM coupler 101 and converts it into an electrical signal.
  • the selectors 112 and 113 determine that it is the first discovery cycle based on the Discovery Window information from the bandwidth allocation control unit 103, and select the first transmission path.
  • the power supply control unit 104 turns off power to unused blocks (the GAIN circuit 118 and the light intensity monitor 120) on the basis of the Discovery Window information from the band allocation control unit 103 to save energy.
  • the AGC circuit 116 performs GAIN adjustment on the data from the O / E converter 111.
  • the GAIN information by the AGC circuit 116 is held in the GAIN control unit 121.
  • the CDR circuit 119 performs phase adjustment on the data that has been GAIN adjusted by the AGC circuit 116.
  • the phase information by the CDR circuit 119 is held in the phase control unit 105.
  • the frame separation unit 106 separates the data received from the CDR circuit 119 via the selector 113 into the User frame and the Register Request frame 12.
  • the User frame separated by the frame separation unit 106 is transmitted to the host device 6, and the Register Request frame 12 is transmitted to the frame control unit 107.
  • the station side apparatus 1 transmits the Register frame 13 and the Gate frame 14 to the subscriber side apparatus 2 (steps ST74 and 75).
  • the bandwidth allocation control unit 103 determines the data transmission start time and duration of each subscriber side apparatus 2 in the next period, and notifies the GAIN control unit 121 and the frame control unit 107 of the data transmission start time and duration. .
  • the Discovery Window information in the next cycle is notified to the selectors 112 and 113 and the power supply control unit 104.
  • the frame control unit 107 recognizes the Register Request frame 12 and then generates the Register frame 13. Further, the Gate frame 14 is generated based on the data transmission start time and duration of each subscriber-side device 2 in the next period notified from the bandwidth allocation control unit 103. At this time, the frame control unit 107 also generates a phase information notification frame in which the phase information extracted from the phase control unit 105 is embedded in an empty area of the Gate frame 14. For example, as shown in FIG. 8, the phase information notification frame is generated by embedding 1 byte in the Pad / Reserved band of the Gate frame 14.
  • the frame multiplexing unit 109 multiplexes the Gate frame 14 embedded with the Register frame 13 and the position information notification frame from the frame control unit 107 and the User frame from the downlink buffer unit 108.
  • the optical transmission unit 110 converts the frame multiplexed by the frame multiplexing unit 109 into an optical signal, and transmits the optical signal to the corresponding subscriber side device 2 via the WDM coupler 101 and the optical splitter 4.
  • the subscriber side device 2 performs phase adjustment and transmits a Register Ack frame 15 to the station side device 1 (steps ST76 and 77).
  • the optical receiving unit 202 receives downlink data from the station side device 1 via the WDM coupler 201 and converts it into an electrical signal.
  • the frame separation unit 203 separates the data converted into the electric signal by the optical reception unit 202 into the User frame, the Register frame 13 and the Gate frame 14 in which the position information notification frame is embedded.
  • the frame control unit 204 recognizes the Gate frame 14 separated by the frame separation unit 203 and then generates a Register Ack frame 15.
  • the frame control unit 204 extracts the phase information notification frame from the Gate frame 14 and transmits the phase information to the phase control unit 207.
  • the frame multiplexing unit 206 multiplexes the Register Ack frame 15 from the frame control unit 204 and the User frame from the uplink buffer unit 205.
  • the phase control unit 207 performs phase adjustment on the frame transmitted to the optical transmission unit 208 using the phase information from the frame control unit 204.
  • the optical transmission unit 208 converts the frame multiplexed by the frame multiplexing unit 206 and phase-adjusted by the phase control unit 207 into an optical signal, and transmits the optical signal to the station-side apparatus 1 via the WDM coupler 201 and the optical splitter 4. To do.
  • the station apparatus 1 performs GAIN adjustment and updates the GAIN amount and the phase adjustment amount (step ST78).
  • the O / E converter 111 receives the uplink data from the subscriber side apparatus 2 via the WDM coupler 101 and converts it into an electrical signal.
  • the selectors 112 and 113 determine that it is not the first discovery cycle based on the Discovery Window information from the bandwidth allocation control unit 103, and switch to the second transmission path.
  • the power control unit 104 turns off the power of the unused block (AGC circuit 116) based on the Discovery Window information from the band allocation control unit 103 to save energy.
  • the light intensity monitor 120 calculates the GAIN amount required for the GAIN adjustment based on the data received from the O / E converter 111 via the selector 112 and notifies the GAIN control unit 121 of the GAIN information.
  • the data input to the light intensity monitor 120 is transmitted to the GAIN circuit 118 as it is.
  • the GAIN circuit 118 extracts the GAIN amount of the corresponding previous period from the GAIN control unit 121 based on the data transmission start time and duration of each subscriber side device 2 notified from the band allocation control unit 103. Using this GAIN amount, GAIN adjustment is performed on the data of the current cycle received from the O / E converter 111 via the light intensity monitor 120.
  • the data subjected to GAIN adjustment by the GAIN circuit 118 is branched into two, one being transmitted to the CDR circuit 119 and the other being transmitted to the frame separation unit 106 via the selector 113.
  • the GAIN control unit 121 updates the GAIN information by overwriting the GAIN information of the current cycle from the light intensity monitor 120 with the GAIN information of the previous cycle held.
  • the CDR circuit 119 extracts the phase adjustment amount based on the data received from the GAIN circuit 118, notifies the phase information to the phase control unit 105, and terminates.
  • the phase control unit 105 updates the phase information by overwriting the phase information of the current cycle from the CDR circuit 119 over the held previous phase information.
  • the frame separation unit 106 separates the data received from the GAIN circuit 118 via the selector 113 into the User frame and the Register Ack frame 15.
  • the User frame separated by the frame separation unit 106 is transmitted to the host device 6, and the Register Ack frame 15 is transmitted to the frame control unit 107.
  • the frame control unit 107 recognizes the Register Ack frame 15 and then generates the Gate frame 14, and thereafter becomes a Gate-Report sequence.
  • the Gate-Report sequence in the light intensity adjustment, the GAIN amount in the current cycle calculated by the light intensity monitor 120 is reflected in the GAIN circuit 118 in the next cycle, so that the GAIN amount is updated every cycle.
  • the phase adjustment amount is updated every cycle by transmitting the phase adjustment amount extracted by the CDR circuit 119 to the ONU 5 every cycle.
  • the data from each subscriber side device 2 passes through the light intensity monitor 120 and GAIN.
  • the data is branched into two at the front stage of the light intensity monitor 120, and one data is input to the GAIN circuit 118.
  • the GAIN adjustment using the GAIN amount may be performed, and the other data may be input to the light intensity monitor 120 to calculate the GAIN amount for the current cycle.
  • the GAIN amount is updated every cycle.
  • the present invention is not limited to this, and the GAIN amount is updated only when a predetermined event occurs. It may be configured. For example, when the GAIN control unit 121 compares the difference between the GAIN amount held in the previous cycle and the GAIN amount in the current cycle calculated by the light intensity monitor 120 with a predetermined threshold, and the difference is equal to or greater than the threshold.
  • the GAIN readjustment by the AGC circuit 116 may be performed.
  • the MPCP sequence has been described as the phase synchronization method.
  • the present invention is not limited to this, and may be applied to the OAM defined in the PON system. Alternatively, it may be applied to a unique sequence that is not defined in the PON system.
  • Embodiment 1 and 2 demonstrated using the PON system, it is not restricted to this, It can apply similarly to another general optical communication system.
  • any combination of the embodiments, any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .
  • the station side apparatus can reduce the SyncTime by deleting the AGC period, can improve the uplink bandwidth utilization efficiency, and communicates with a plurality of subscriber side apparatuses. Suitable for use in devices.

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Abstract

Provided are: an AGC circuit (116) that performs gain adjustments with respect to data received from subscriber-side devices (2); a gain maintenance unit (117) that maintains gain levels used in the gain adjustments by the AGC circuit (116); a gain circuit (118) that performs gain adjustments with respect to data received from the subscriber-side devices (2) by using the gain levels maintained by the gain maintenance unit (117); and selectors (112, 113) that select, as a transmission path for data received from the subscriber-side devices (2), a transmission path that passes through the AGC circuit (116) or a transmission path that passes through the gain circuit (118).

Description

局側装置Station side equipment
　この発明は、複数の加入者側装置（ＯＮＵ：Ｏｐｔｉｃａｌ　Ｎｅｔｗｏｒｋ　Ｕｎｉｔ）との間で通信を行う局側装置（ＯＬＴ：Ｏｐｔｉｃａｌ　Ｌｉｎｅ　Ｔｅｒｍｉｎａｌ）において、上り伝送効率向上を図った局側装置に関するものである。 The present invention relates to a station-side device that improves upstream transmission efficiency in a station-side device (OLT: Optical Line Terminal) that communicates with a plurality of subscriber-side devices (ONU: Optical Network Unit). .
　近年、インターネットの普及により、一本の光ファイバを複数の加入者宅に引き込むＰＯＮ（Ｐａｓｓｉｖｅ　Ｏｐｔｉｃａｌ　Ｎｅｔｗｏｒｋ）技術が発展してきている。中でも主流であるＦＴＴＨ（Ｆｉｂｅｒ　Ｔｏ　Ｔｈｅ　Ｈｏｍｅ）サービスの利用者が増加している。
　ＦＴＴＨサービスとは、光ファイバによる家庭向けのデータ通信サービスである。構成としては、１つの局側装置に対して複数の加入者側装置が光ファイバおよび光カプラにより接続されたものであり、局側装置と各加入者側装置との間でデータの送受信を行っている。
　なお、局側装置から加入者側装置へデータを伝送する伝送方向を下り、加入者側装置から局側装置へデータを伝送する伝送方向を上りと定義する。 In recent years, with the spread of the Internet, a PON (Passive Optical Network) technology for drawing a single optical fiber into a plurality of subscriber homes has been developed. In particular, the number of users of the mainstream FTTH (Fiber To The Home) service is increasing.
The FTTH service is a home data communication service using optical fibers. As a configuration, a plurality of subscriber-side devices are connected to one station-side device by optical fibers and optical couplers, and data is transmitted and received between the station-side device and each subscriber-side device. ing.
The transmission direction for transmitting data from the station side device to the subscriber side device is defined as downlink, and the transmission direction for transmitting data from the subscriber side device to the station side device is defined as uplink.
　現状のＰＯＮシステムでは、下りのデータ伝送は連続伝送方式であるのに対して、上りのデータ伝送はバースト伝送方式である。バースト伝送方式とは、物理媒体上での信号が１つの固まり（バースト）として送られる伝送方式である。
　この上りのデータ伝送では、複数の加入者側装置からのデータを時分割多重して局側装置に伝送している。そのため、上りの伝送効率を上げることが高速通信化を実現する上で重要となる。 In the current PON system, downstream data transmission is a continuous transmission system, whereas upstream data transmission is a burst transmission system. The burst transmission method is a transmission method in which signals on a physical medium are sent as one unit (burst).
In this uplink data transmission, data from a plurality of subscriber side devices is time-division multiplexed and transmitted to the station side device. Therefore, increasing uplink transmission efficiency is important in realizing high-speed communication.
　一方、上りのデータ伝送では、加入者側装置毎に通信距離が異なるため、光強度と位相の異なるバーストが送られてくる。そのため、先頭でビット同期を取り直すため、光強度調整（ＡＧＣ：Ａｕｔｏｍａｔｉｃ　Ｇａｉｎ　Ｃｏｎｔｒｏｌ）期間および位相調整（ＣＤＲ：Ｃｌｏｃｋ　ａｎｄ　Ｄａｔａ　Ｒｅｃｏｖｅｒｙ）期間である同期期間（ＳｙｎｃＴｉｍｅ）を設ける必要がある。 On the other hand, in uplink data transmission, since the communication distance is different for each subscriber-side device, bursts having different light intensity and phase are transmitted. Therefore, in order to reestablish bit synchronization at the head, it is necessary to provide a synchronization period (SyncTime) that is a light intensity adjustment (AGC: Automatic Gain Control) period and a phase adjustment (CDR: Clock and Data Recovery) period.
　そこで、特許文献１では、局側装置と加入者側装置までの往復時間であるＲＴＴ（Ｒｏｕｎｄ　Ｔｒｉｐ　Ｔｉｍｅ）および局側装置に入力する光強度を計測し、ＡＧＣ回路に計測値に応じた初期ＧＡＩＮをプリセットすることで、ＡＧＣ期間を短縮している。これにより、ＳｙｎｃＴｉｍｅを従来よりも短縮することができ、上り帯域の有効利用を図ることができる。 Therefore, in Patent Document 1, RTT (Round Trip Time) which is the round trip time between the station side device and the subscriber side device and the light intensity input to the station side device are measured, and the initial GAIN corresponding to the measured value is measured in the AGC circuit. The AGC period is shortened by presetting. Thereby, SyncTime can be shortened compared with the past, and an effective utilization of an upstream band can be aimed at.
　また、特許文献２では、１つの加入者側装置に複数の論理リンク情報（ＬＬＩＤ：Ｌｏｇｉｃａｌ　Ｌｉｎｋ．ＩＤ）を設けた場合に、加入者側装置が複数のデータフレームを連結して送信している。これにより、ＳｙｎｃＴｉｍｅを削減することができ、上り帯域の有効利用を図ることができる。 Further, in Patent Document 2, when a plurality of logical link information (LLID: Logical Link. ID) is provided in one subscriber side device, the subscriber side device concatenates and transmits a plurality of data frames. . As a result, SyncTime can be reduced, and the upstream bandwidth can be effectively used.
特開２００８－１９９２３３号公報JP 2008-199233 A 特開２００７－１１６５８７号公報Japanese Patent Application Laid-Open No. 2007-116587
　上記のように、従来のＰＯＮシステムを適応した光通信システムでは、加入者側装置毎に光強度と位相が異なるバーストが送られてくるため、ＡＧＣ期間およびＣＤＲ期間であるＳｙｎｃＴｉｍｅが必要となる。しかしながら、このＳｙｎｃＴｉｍｅの期間にはデータを送信することができず、伝送効率を下げる働きをしてしまうため、上り帯域の有効利用が図れないという課題があった。 As described above, in an optical communication system adapted to the conventional PON system, since bursts having different optical intensity and phase are transmitted for each subscriber-side apparatus, SyncTime that is an AGC period and a CDR period is required. However, since data cannot be transmitted during this SyncTime period and the transmission efficiency is lowered, there is a problem that effective use of the upstream band cannot be achieved.
　また、特許文献１の技術では、局側装置と加入者側装置までのＲＴＴと局側装置に入力する光強度を計測することで、ＡＧＣ期間を短縮している。しかしながら、ＡＧＣ期間を削除することはできていないという課題があった。 In the technique of Patent Document 1, the AGC period is shortened by measuring the RTT to the station side apparatus and the subscriber side apparatus and the light intensity input to the station side apparatus. However, there is a problem that the AGC period cannot be deleted.
　また、特許文献２の技術は、１つの加入者側装置に複数のＬＬＩＤを設けた場合に、複数のデータフレームを連結することで、ＳｙｎｃＴｉｍｅを削減している。したがって、１つの加入者側装置に１つのＬＬＩＤを持たせた場合における上りデータ伝送効率化については適用することができないという課題があった。 Also, the technique of Patent Document 2 reduces SyncTime by connecting a plurality of data frames when a plurality of LLIDs are provided in one subscriber side device. Therefore, there has been a problem that it is not possible to apply uplink data transmission efficiency when one subscriber-side device has one LLID.
　この発明は、上記のような課題を解決するためになされたもので、ＡＧＣ期間を削除することでＳｙｎｃＴｉｍｅを削減することができ、上り帯域利用効率を向上させることができる局側装置を提供することを目的としている。 The present invention has been made to solve the above-described problems, and provides a station-side apparatus that can reduce SyncTime by deleting an AGC period and can improve uplink bandwidth utilization efficiency. The purpose is that.
　この発明に係る局側装置は、各加入者側装置から受信したデータに対してＧＡＩＮ調整を行うＡＧＣ回路と、ＡＧＣ回路によるＧＡＩＮ調整で用いられたＧＡＩＮ量を保持するＧＡＩＮ保持部と、各加入者側装置から受信したデータに対して、ＧＡＩＮ保持部に保持されているＧＡＩＮ量を用いてＧＡＩＮ調整を行うＧＡＩＮ回路と、各加入者側装置から受信したデータの送信経路として、ＡＧＣ回路を通過する送信経路またはＧＡＩＮ回路を通過する送信経路を選択するセレクタとを備えたものである。 The station-side device according to the present invention includes an AGC circuit that performs GAIN adjustment on data received from each subscriber-side device, a GAIN holding unit that holds a GAIN amount used in GAIN adjustment by the AGC circuit, and each subscription The GAIN circuit that performs GAIN adjustment using the GAIN amount held in the GAIN holding unit for the data received from the subscriber side device, and the AGC circuit as the transmission path of the data received from each subscriber side device And a selector for selecting a transmission path that passes through the GAIN circuit.
　この発明によれば、上記のように構成したので、ＡＧＣ期間を削除することでＳｙｎｃＴｉｍｅを削減することができ、上り帯域利用効率を向上させることができる。 According to this invention, since it is configured as described above, it is possible to reduce the SyncTime by deleting the AGC period, and it is possible to improve the uplink bandwidth utilization efficiency.
実施の形態１に係るＰＯＮシステムの構成を示すブロック図である。1 is a block diagram showing a configuration of a PON system according to Embodiment 1. FIG. 実施の形態１に係るＰＯＮシステム内の各部の構成を示すブロック図である。FIG. 2 is a block diagram illustrating a configuration of each unit in the PON system according to the first embodiment. 実施の形態１に係るＰＯＮシステムの動作を示すシーケンス図である。FIG. 3 is a sequence diagram showing an operation of the PON system according to the first embodiment. 実施の形態１における位相情報を埋め込んだＲｅｇｉｓｔｅｒフレームの構成を示す図である。6 is a diagram illustrating a configuration of a Register frame in which phase information is embedded in Embodiment 1. FIG. 実施の形態１における上りバーストフレームの構成を示す図である。3 is a diagram illustrating a configuration of an uplink burst frame in Embodiment 1. FIG. 実施の形態２に係るＰＯＮシステム内の各部の構成を示すブロック図である。FIG. 6 is a block diagram illustrating a configuration of each unit in a PON system according to Embodiment 2. 実施の形態２に係るＰＯＮシステムの動作を示すシーケンス図である。FIG. 10 is a sequence diagram showing an operation of the PON system according to the second embodiment. 実施の形態２における位相情報を埋め込んだＧａｔｅフレームの構成を示す図である。It is a figure which shows the structure of the Gate frame which embedded the phase information in Embodiment 2. FIG. 実施の形態２に係るＰＯＮシステム内の各部の別の構成を示すブロック図である。FIG. 10 is a block diagram illustrating another configuration of each unit in the PON system according to the second embodiment.
　以下、この発明の実施の形態について図面を参照しながら詳細に説明する。
実施の形態１．
　図１はこの発明の実施の形態１に係るＰＯＮシステムを示す図であり、図２は各部の構成を示すブロック図である。
　ＰＯＮシステムは、図１，２に示すように、局舎側に設置される局側装置（ＯＬＴ）１と、複数の宅内側にそれぞれ設置される加入者側装置（ＯＮＵ）２－１～２－ｎ（以下、加入者側装置２と示す）とを備えている。
　この局側装置１と複数の加入者側装置２は、光ファイバ３、光スプリッタ４および光ファイバ５－１～５－ｎ（以下、光ファイバ５と示す）を介して接続され、上下データの送受信を行う。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a diagram showing a PON system according to Embodiment 1 of the present invention, and FIG. 2 is a block diagram showing the configuration of each part.
As shown in FIGS. 1 and 2, the PON system includes a station-side device (OLT) 1 installed on the station side and subscriber-side devices (ONU) 2-1 to 2 installed on a plurality of premises. -N (hereinafter referred to as subscriber-side device 2).
The station-side device 1 and the plurality of subscriber-side devices 2 are connected via an optical fiber 3, an optical splitter 4, and optical fibers 5-1 to 5-n (hereinafter referred to as optical fiber 5). Send and receive.
　また、図２に示すように、局側装置１は上位装置６と接続され、上下データの送受信を行う。また、加入者側装置２は下位装置７と接続され、上下データの送受信を行う。
　なお、上位装置６から下位装置７への伝送方向を下り、下位装置７から上位装置６への伝送方向を上りと定義する。 Further, as shown in FIG. 2, the station side device 1 is connected to the host device 6 and transmits and receives the upper and lower data. Further, the subscriber side device 2 is connected to the lower level device 7 and transmits and receives upper and lower data.
Note that the transmission direction from the higher level device 6 to the lower level device 7 is defined as downlink, and the transmission direction from the lower level device 7 to the higher level device 6 is defined as uplink.
　局側装置１は、ＷＤＭ（Ｗａｖｅｌｅｎｇｔｈ　Ｄｉｖｉｓｉｏｎ　Ｍｕｌｔｉｐｌｅｘｉｎｇ）カプラ１０１、光受信部１０２、帯域割当制御部１０３、電源制御部１０４、位相制御部１０５、フレーム分離部１０６、フレーム制御部１０７、下りバッファ部１０８、フレーム多重部１０９および光送信部１１０を備えている。 The station apparatus 1 includes a WDM (Wavelength Division Multiplexing) coupler 101, an optical receiving unit 102, a bandwidth allocation control unit 103, a power supply control unit 104, a phase control unit 105, a frame separation unit 106, a frame control unit 107, and a downlink buffer unit 108. The frame multiplexer 109 and the optical transmitter 110 are provided.
　ＷＤＭカプラ１０１は、光スプリッタ４を介して各加入者側装置２からの上りデータを光受信部１０２に送信し、光送信部１１０からの下りデータを光スプリッタ４を介して各加入者側装置２に送信するものである。 The WDM coupler 101 transmits uplink data from each subscriber side device 2 to the optical receiving unit 102 via the optical splitter 4, and downlink data from the optical transmission unit 110 via the optical splitter 4 to each subscriber side device. 2 is transmitted.
　光受信部１０２は、ＷＤＭカプラ１０１を介して各加入者側装置２からの上りデータを受信するものである。この光受信部１０２は、Ｏ／Ｅ（Ｏｐｔｉｃａｌ／Ｅｌｅｃｔｒｉｃａｌ）変換器１１１、セレクタ１１２，１１３、強度調整部１１４および位相調整部１１５を備えている。 The optical receiver 102 receives uplink data from each subscriber side device 2 via the WDM coupler 101. The optical receiving unit 102 includes an O / E (Optical / Electrical) converter 111, selectors 112 and 113, an intensity adjusting unit 114, and a phase adjusting unit 115.
　Ｏ／Ｅ変換器１１１は、ＷＤＭカプラ１０１を介して各加入者側装置２から受信した上りデータ（バースト光信号）を電気信号に変換するものである。Ｏ／Ｅ変換器１１１により電気信号に変換されたデータはセレクタ１１２に送信される。 The O / E converter 111 converts the uplink data (burst optical signal) received from each subscriber apparatus 2 via the WDM coupler 101 into an electric signal. Data converted into an electrical signal by the O / E converter 111 is transmitted to the selector 112.
　セレクタ１１２，１１３は、帯域割当制御部１０３から通知された各加入者側装置２との通信周期に基づいて、強度調整部１１４内および位相調整部１１５内の送信経路を切り替えるものである。ここで、セレクタ１１２，１１３は、加入者側装置２との通信周期が初回周期（最初のｄｉｓｃｏｖｅｒｙ周期）の場合には、図２の第１送信経路（後述するＡＧＣ回路１１６およびＣＤＲ回路１１９を通過する送信経路）を選択し、初回周期以外の周期の場合には、第２送信経路（ＧＡＩＮ回路１１８を通過する送信経路）を選択する。 The selectors 112 and 113 switch the transmission paths in the intensity adjusting unit 114 and the phase adjusting unit 115 based on the communication cycle with each subscriber apparatus 2 notified from the band allocation control unit 103. Here, when the communication cycle with the subscriber side apparatus 2 is the initial cycle (first discovery cycle), the selectors 112 and 113 change the first transmission path (AGC circuit 116 and CDR circuit 119 described later) in FIG. (Transmission path that passes through) is selected, and in the case of a period other than the initial period, the second transmission path (transmission path that passes through the GAIN circuit 118) is selected.
　強度調整部１１４は、セレクタ１１２を介してＯ／Ｅ変換器１１１から受信したデータに対してＧＡＩＮ調整を行うものである。この強度調整部１１４は、ＡＧＣ回路１１６、ＧＡＩＮ保持部１１７およびＧＡＩＮ回路１１８を備えている。 The intensity adjustment unit 114 performs GAIN adjustment on data received from the O / E converter 111 via the selector 112. The intensity adjusting unit 114 includes an AGC circuit 116, a GAIN holding unit 117, and a GAIN circuit 118.
　ＡＧＣ回路１１６は、セレクタ１１２を介してＯ／Ｅ変換器１１１から受信したデータに対してＧＡＩＮ調整を行うものである。このＡＧＣ回路１１６によりＧＡＩＮ調整されたデータは位相調整部１１５に送信される。また、ＡＧＣ回路１１６により、各加入者側装置２のデータに対して用いられたＧＡＩＮ量を示すＧＡＩＮ情報は、ＧＡＩＮ保持部１１７に送信される。 The AGC circuit 116 performs GAIN adjustment on the data received from the O / E converter 111 via the selector 112. The data subjected to GAIN adjustment by the AGC circuit 116 is transmitted to the phase adjustment unit 115. Further, the GAIN information indicating the GAIN amount used for the data of each subscriber side device 2 is transmitted to the GAIN holding unit 117 by the AGC circuit 116.
　ＧＡＩＮ保持部１１７は、ＡＧＣ回路１１６から受信した加入者側装置２毎のＧＡＩＮ情報を保持するものである。このＧＡＩＮ保持部１１７に保持されているＧＡＩＮ情報はＧＡＩＮ回路１１８により抽出される。 The GAIN holding unit 117 holds GAIN information for each subscriber side device 2 received from the AGC circuit 116. The GAIN information held in the GAIN holding unit 117 is extracted by the GAIN circuit 118.
　ＧＡＩＮ回路１１８は、帯域割当制御部１０３から通知された各加入者側装置２のデータ送信開始時間および継続時間に基づいて、ＧＡＩＮ保持部１１７から該当するＧＡＩＮ量を抽出し、このＧＡＩＮ量を用いて、セレクタ１１２を介してＯ／Ｅ変換器１１１から受信したデータに対してＧＡＩＮ調整を行うものである。このＧＡＩＮ回路１１８によりＧＡＩＮ調整されたデータはセレクタ１１３を介してフレーム分離部１０６に送信される。 The GAIN circuit 118 extracts the corresponding GAIN amount from the GAIN holding unit 117 based on the data transmission start time and duration of each subscriber side device 2 notified from the band allocation control unit 103, and uses this GAIN amount. Thus, GAIN adjustment is performed on the data received from the O / E converter 111 via the selector 112. The data subjected to the GAIN adjustment by the GAIN circuit 118 is transmitted to the frame separation unit 106 via the selector 113.
　位相調整部１１５は、強度調整部１１４から受信したデータに対して位相調整を行うものである。この位相調整部１１５は、ＣＤＲ回路１１９を備えている。
　ＣＤＲ回路１１９は、強度調整部１１４から受信したデータに対して位相調整を行うものである。このＣＤＲ回路１１９により位相調整されたデータはセレクタ１１３を介してフレーム分離部１０６に送信される。また、ＣＤＲ回路１１９により、各加入者側装置のデータに対して用いられた位相調整量を示す位相情報は、位相制御部１０５に送信される。 The phase adjustment unit 115 adjusts the phase of the data received from the intensity adjustment unit 114. The phase adjustment unit 115 includes a CDR circuit 119.
The CDR circuit 119 performs phase adjustment on the data received from the intensity adjustment unit 114. The data whose phase is adjusted by the CDR circuit 119 is transmitted to the frame separation unit 106 via the selector 113. Also, the CDR circuit 119 transmits phase information indicating the phase adjustment amount used for the data of each subscriber side device to the phase control unit 105.
　帯域割当制御部１０３は、次の周期での各加入者側装置２のデータ送信開始時間および継続時間を決定し、各ブロック（ＧＡＩＮ保持部１１７およびフレーム制御部１０７）に通知するものである。また、帯域割当制御部１０３は、Ｄｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報を各ブロック（セレクタ１１２，１１３および電源制御部１０４）に通知する。 The bandwidth allocation control unit 103 determines the data transmission start time and duration of each subscriber side device 2 in the next cycle, and notifies each block (GAIN holding unit 117 and frame control unit 107). In addition, the bandwidth allocation control unit 103 notifies the Discovery Window information to each block (the selectors 112 and 113 and the power control unit 104).
　このＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報とは、Ｄｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ（未登録の加入者側装置２が局側装置１に登録要請を行う期間）でやり取りする情報（ＰＯＮリンクを確立するのに必要となる情報）である。このＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報には、加入者側装置２との通信周期が最初のｄｉｓｃｏｖｅｒｙ周期であるかを示す情報が含まれている。なお、ｄｉｓｃｏｖｅｒｙ周期とは、Ｄｉｓｃｅｖｅｒｙ　Ｗｉｎｄｏｗの生成周期である。 This Discovery Window information is information (information necessary to establish a PON link) exchanged in Discovery Window (period in which the unregistered subscriber side device 2 makes a registration request to the station side device 1). This Discovery Window information includes information indicating whether the communication cycle with the subscriber apparatus 2 is the first discovery cycle. The discovery period is a generation period of Discovery Window.
　電源制御部１０４は、帯域割当制御部１０３から通知された各加入者側装置２との通信周期に基づいて、セレクタ１１２，１１３により選択されていない送信経路上の未使用ブロック（ＡＧＣ回路１１６、ＣＤＲ回路１１９またはＧＡＩＮ回路１１８）の電源をＯＦＦにするものである。 Based on the communication cycle with each subscriber side device 2 notified from the bandwidth allocation control unit 103, the power supply control unit 104 uses unused blocks (AGC circuits 116, 116) on the transmission path not selected by the selectors 112 and 113. The power of the CDR circuit 119 or the GAIN circuit 118) is turned off.
　位相制御部１０５は、ＣＤＲ回路１１９から受信した加入者側装置２毎の位相情報を保持するものである。この位相制御部１０５に保持されている位相情報はフレーム制御部１０７により抽出される。
　フレーム分離部１０６は、セレクタ１１３から受信したデータをＵｓｅｒフレーム（受信データ）と制御フレーム（Ｒｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム、Ｒｅｇｉｓｔｅｒ　ＡｃｋフレームまたはＲｅｐｏｒｔフレーム）とに分離するものである。このフレーム分離部１０６により分離されたＵｓｅｒフレームは上位装置６に送信され、制御フレームはフレーム制御部１０７に送信される。 The phase control unit 105 holds the phase information for each subscriber side device 2 received from the CDR circuit 119. The phase information held in the phase control unit 105 is extracted by the frame control unit 107.
The frame separation unit 106 separates the data received from the selector 113 into a User frame (received data) and a control frame (Register Request frame, Register Ack frame or Report frame). The User frame separated by the frame separation unit 106 is transmitted to the host device 6, and the control frame is transmitted to the frame control unit 107.
　フレーム制御部１０７は、フレーム分離部１０６からの制御フレームを認識した場合に、帯域割当制御部１０３や位相制御部１０５からの情報に基づいて、制御フレーム（Ｄｉｓｃｏｖｅｒｙ　Ｇａｔｅフレーム、ＲｅｇｉｓｔｅｒフレームまたはＧａｔｅフレーム）や、位相情報が含まれた位相情報通知フレームを生成するものである。なお、位相情報通知フレームはＲｅｇｉｓｔｅｒフレームの空き領域に埋め込まれて構成される。このフレーム制御部１０７により生成された制御フレームはフレーム多重部１０９に送信される。 When the frame control unit 107 recognizes the control frame from the frame separation unit 106, the frame control unit 107 controls the control frame (Discovery Gate frame, Register frame, or Gate frame) based on information from the band allocation control unit 103 and the phase control unit 105. Alternatively, a phase information notification frame including phase information is generated. The phase information notification frame is configured to be embedded in an empty area of the Register frame. The control frame generated by the frame control unit 107 is transmitted to the frame multiplexing unit 109.
　下りバッファ部１０８は、上位装置６から受信した下りデータを一時的に蓄積するものである。この下りバッファ部１０８に蓄積された下りデータ（Ｕｓｅｒフレーム）はフレーム多重部１０９により読み出される。 The downlink buffer unit 108 temporarily accumulates downlink data received from the host device 6. The downlink data (User frame) stored in the downlink buffer unit 108 is read by the frame multiplexing unit 109.
　フレーム多重部１０９は、下りバッファ部１０８から読み出したＵｓｅｒフレーム（受信データ）とフレーム制御部１０７からの制御フレーム（Ｄｉｓｃｏｖｅｒｙ　Ｇａｔｅフレーム、ＲｅｇｉｓｔｅｒフレームまたはＧａｔｅフレーム）とを多重するものである。このフレーム多重部１０９により多重されたフレームは光送信部１１０に送信される。 The frame multiplexing unit 109 multiplexes the User frame (received data) read from the downlink buffer unit 108 and the control frame (Discovery Gate frame, Register frame, or Gate frame) from the frame control unit 107. The frame multiplexed by the frame multiplexing unit 109 is transmitted to the optical transmission unit 110.
　光送信部１１０は、フレーム多重部１０９からのフレーム（電気信号）を光信号に変換するものである。この光送信部１１０により光信号に変換されたフレーム（下りデータ）はＷＤＭカプラ１０１に送信される。 The optical transmission unit 110 converts a frame (electric signal) from the frame multiplexing unit 109 into an optical signal. The frame (downlink data) converted into an optical signal by the optical transmission unit 110 is transmitted to the WDM coupler 101.
　また、加入者側装置２は、ＷＤＭカプラ２０１、光受信部２０２、フレーム分離部２０３、フレーム制御部２０４、上りバッファ部２０５、フレーム多重部２０６、位相制御部２０７および光送信部２０８を備えている。 The subscriber-side device 2 includes a WDM coupler 201, an optical receiving unit 202, a frame separation unit 203, a frame control unit 204, an uplink buffer unit 205, a frame multiplexing unit 206, a phase control unit 207, and an optical transmission unit 208. Yes.
　ＷＤＭカプラ２０１は、光スプリッタ４を介して局側装置１からの下りデータを光受信部２０２に送信し、光送信部２０８からの上りデータを光スプリッタ４を介して局側装置１に送信するものである。 The WDM coupler 201 transmits downlink data from the station side device 1 to the optical receiving unit 202 via the optical splitter 4, and transmits uplink data from the optical transmission unit 208 to the station side device 1 via the optical splitter 4. Is.
　光受信部２０２は、ＷＤＭカプラ２０１を介して局側装置１からの下りデータ（光信号）を受信し、電気信号に変換するものである。この光受信部２０２により電気信号に変換されたデータはフレーム分離部２０３に送信される。 The optical receiving unit 202 receives downlink data (optical signal) from the station side device 1 via the WDM coupler 201 and converts it into an electrical signal. The data converted into an electrical signal by the optical receiver 202 is transmitted to the frame separator 203.
　フレーム分離部２０３は、光受信部２０２から受信したデータをＵｓｅｒフレーム（受信データ）と制御フレーム（Ｄｉｓｃｏｖｅｒｙ　Ｇａｔｅフレーム、ＲｅｇｉｓｔｅｒフレームまたはＧａｔｅフレーム）とに分離するものである。このフレーム分離部２０３により分離されたＵｓｅｒフレームは下位装置７に送信され、制御フレームはフレーム制御部２０４に送信される。 The frame separation unit 203 separates the data received from the optical reception unit 202 into a User frame (reception data) and a control frame (Discovery Gate frame, Register frame or Gate frame). The User frame separated by the frame separation unit 203 is transmitted to the lower apparatus 7, and the control frame is transmitted to the frame control unit 204.
　フレーム制御部２０４は、フレーム分離部２０３からの制御フレーム（Ｕｓｅｒフレーム以外の全フレーム）を処理するものである。このフレーム制御部２０４は、Ｒｅｇｉｓｔｅｒフレームから位相情報通知フレームを抽出し、位相情報を位相制御部２０７へ送信する。 The frame control unit 204 processes the control frame (all frames other than the User frame) from the frame separation unit 203. The frame control unit 204 extracts a phase information notification frame from the Register frame and transmits the phase information to the phase control unit 207.
　上りバッファ部２０５は、下位装置７から受信した上りデータを一時的に蓄積するものである。この上りバッファ部２０５に蓄積された上りデータ（Ｕｓｅｒフレーム）はフレーム多重部２０６により読み出される。 The upstream buffer unit 205 temporarily stores upstream data received from the lower device 7. The uplink data (User frame) stored in the uplink buffer unit 205 is read by the frame multiplexing unit 206.
　フレーム多重部２０６は、上りバッファ部２０５から読み出したＵｓｅｒフレーム（受信データ）とフレーム制御部２０４からの制御フレーム（Ｒｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム、Ｒｅｇｉｓｔｅｒ　ＡｃｋフレームまたはＲｅｐｏｒｔフレーム）とを多重するものである。このフレーム多重部２０６により多重されたフレームは光送信部２０８に送信される。 The frame multiplexing unit 206 multiplexes the User frame (received data) read from the uplink buffer unit 205 and the control frame (Register Request frame, Register Ack frame or Report frame) from the frame control unit 204. The frame multiplexed by the frame multiplexing unit 206 is transmitted to the optical transmission unit 208.
　位相制御部２０７は、フレーム制御部２０４からの位相情報を用いて、光送信部２０８に送信されたフレームに対して位相調整を行うものである。
　光送信部２０８は、フレーム多重部２０６により多重され、位相制御部２０７により位相が調整されたフレーム（電気信号）を光信号に変換するものである。この光送信部２０８により光信号に変換されたフレーム（上りデータ）はＷＤＭカプラ２０１に送信される。 The phase control unit 207 performs phase adjustment on the frame transmitted to the optical transmission unit 208 using the phase information from the frame control unit 204.
The optical transmission unit 208 converts the frame (electric signal) multiplexed by the frame multiplexing unit 206 and adjusted in phase by the phase control unit 207 into an optical signal. The frame (uplink data) converted into an optical signal by the optical transmission unit 208 is transmitted to the WDM coupler 201.
　次に、上記のように構成されたＰＯＮシステムの動作について説明する。
　図３はこの発明の実施の形態１に係るＰＯＮシステムの動作を示すシーケンス図である。なお、実施の形態１に係るＰＯＮシステムでは、位相同期を行う方法として、ＭＰＣＰ（Ｍｕｌｔｉ－Ｐｏｉｎｔ　Ｃｏｎｔｒｏｌ　Ｐｒｏｔｏｃｏｌ）のＤｉｓｃｏｖｅｒｙシーケンスを利用した場合について述べる。 Next, the operation of the PON system configured as described above will be described.
FIG. 3 is a sequence diagram showing the operation of the PON system according to Embodiment 1 of the present invention. In the PON system according to the first embodiment, a case where a discovery sequence of MPCP (Multi-Point Control Protocol) is used as a method for performing phase synchronization will be described.
　ＰＯＮシステムの動作では、図３に示すように、まず、局側装置１はＤｉｓｃｏｖｅｒｙ　Ｇａｔｅフレーム１１を未登録の加入者側装置２に送信する（ステップＳＴ３１）。Ｄｉｓｃｏｖｅｒｙ　Ｇａｔｅフレーム１１とは、局側装置１から未登録の加入者側装置２に対して登録要請する期間を通知するフレームである。
　このステップＳＴ３１では、まず、フレーム制御部１０７は、未登録の加入者側装置２に対するＤｉｓｃｏｖｅｒｙ　Ｇａｔｅフレーム１１を生成する。次に、フレーム多重部１０９は、フレーム制御部１０７からのＤｉｓｃｏｖｅｒｙ　Ｇａｔｅフレーム１１と下りバッファ部１０８からのＵｓｅｒフレームとを多重する。次に、光送信部１１０は、フレーム多重部１０９により多重されたフレームを光信号に変換し、ＷＤＭカプラ１０１および光スプリッタ４を介して未登録の加入者側装置２に送信する。 In the operation of the PON system, as shown in FIG. 3, first, the station side device 1 transmits the Discovery Gate frame 11 to the unregistered subscriber side device 2 (step ST31). The Discovery Gate frame 11 is a frame for notifying the registration request period from the station side device 1 to the unregistered subscriber side device 2.
In this step ST31, first, the frame control unit 107 generates the Discovery Gate frame 11 for the unregistered subscriber side device 2. Next, the frame multiplexing unit 109 multiplexes the Discovery Gate frame 11 from the frame control unit 107 and the User frame from the downlink buffer unit 108. Next, the optical transmission unit 110 converts the frame multiplexed by the frame multiplexing unit 109 into an optical signal, and transmits the optical signal to the unregistered subscriber side device 2 via the WDM coupler 101 and the optical splitter 4.
　次いで、加入者側装置２はＲｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム１２を局側装置１に送信する（ステップＳＴ３２）。Ｒｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム１２とは、加入者側装置２が登録要請を行うフレームである。
　このステップＳＴ３２では、まず、光受信部２０２は、ＷＤＭカプラ２０１を介して局側装置１から下りデータを受信し、電気信号に変換する。次に、フレーム分離部２０３は、光受信部２０２により電気信号に変換されたデータをＵｓｅｒフレームとＤｉｓｃｏｖｅｒｙ　Ｇａｔｅフレーム１１とに分離する。次に、フレーム制御部２０４は、フレーム分離部２０３により分離されたＤｉｓｃｏｖｅｒｙ　Ｇａｔｅフレーム１１を認識した後、Ｒｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム１２を生成する。次に、フレーム多重部２０６は、フレーム制御部２０４からのＲｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム１２と上りバッファ部２０５からのＵｓｅｒフレームとを多重する。次に、光送信部２０８は、フレーム多重部２０６により多重されたフレームを光信号に変換し、ＷＤＭカプラ２０１および光スプリッタ４を介して局側装置１に送信する。 Next, the subscriber side device 2 transmits a Register Request frame 12 to the station side device 1 (step ST32). The Register Request frame 12 is a frame in which the subscriber side apparatus 2 makes a registration request.
In step ST32, first, the optical receiving unit 202 receives downlink data from the station side device 1 via the WDM coupler 201 and converts it into an electrical signal. Next, the frame separation unit 203 separates the data converted into the electrical signal by the optical reception unit 202 into the User frame and the Discovery Gate frame 11. Next, the frame control unit 204 recognizes the Discovery Gate frame 11 separated by the frame separation unit 203, and then generates a Register Request frame 12. Next, the frame multiplexing unit 206 multiplexes the Register Request frame 12 from the frame control unit 204 and the User frame from the uplink buffer unit 205. Next, the optical transmission unit 208 converts the frame multiplexed by the frame multiplexing unit 206 into an optical signal, and transmits the optical signal to the station side device 1 via the WDM coupler 201 and the optical splitter 4.
　次いで、局側装置１は、ＧＡＩＮ調整および位相調整を行い、ＧＡＩＮ情報および位相情報を取得する（ステップＳＴ３３）。
　このステップＳＴ３３では、まず、Ｏ／Ｅ変換器１１１は、ＷＤＭカプラ１０１を介して加入者側装置２からの上りデータを受信し、電気信号に変換する。次に、セレクタ１１２，１１３は、帯域割当制御部１０３からのＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報に基づいて最初のｄｉｓｃｏｖｅｒｙ周期であると判断し、第１送信経路に切り替える。また、電源制御部１０４は、帯域割当制御部１０３からのＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報に基づいて、未使用ブロック（ＧＡＩＮ回路１１８）の電源をＯＦＦにして、省エネを図る。 Next, the station apparatus 1 performs GAIN adjustment and phase adjustment, and acquires GAIN information and phase information (step ST33).
In this step ST33, first, the O / E converter 111 receives the uplink data from the subscriber side device 2 via the WDM coupler 101 and converts it into an electrical signal. Next, the selectors 112 and 113 determine that it is the first discovery cycle based on the Discovery Window information from the bandwidth allocation control unit 103, and switch to the first transmission path. In addition, the power control unit 104 turns off the power of the unused block (GAIN circuit 118) based on the Discovery Window information from the band allocation control unit 103 to save energy.
　次に、ＡＧＣ回路１１６は、Ｏ／Ｅ変換器１１１からのデータに対してＧＡＩＮ調整を行う。このＡＧＣ回路１１６によるＧＡＩＮ情報はＧＡＩＮ保持部１１７に保持される。次に、ＣＤＲ回路１１９は、ＡＧＣ回路１１６によりＧＡＩＮ調整されたデータに対して位相調整を行う。このＣＤＲ回路１１９による位相情報は位相制御部１０５に保持される。
　次に、フレーム分離部１０６は、セレクタ１１３を介してＣＤＲ回路１１９から受信したデータをＵｓｅｒフレームとＲｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム１２とに分離する。このフレーム分離部１０６により分離されたＵｓｅｒフレームは上位装置６に送信され、Ｒｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム１２はフレーム制御部１０７に送信される。 Next, the AGC circuit 116 performs GAIN adjustment on the data from the O / E converter 111. The GAIN information by the AGC circuit 116 is held in the GAIN holding unit 117. Next, the CDR circuit 119 performs phase adjustment on the data that has been GAIN adjusted by the AGC circuit 116. The phase information by the CDR circuit 119 is held in the phase control unit 105.
Next, the frame separation unit 106 separates the data received from the CDR circuit 119 via the selector 113 into the User frame and the Register Request frame 12. The User frame separated by the frame separation unit 106 is transmitted to the host device 6, and the Register Request frame 12 is transmitted to the frame control unit 107.
　次いで、局側装置１はＲｅｇｉｓｔｅｒフレーム１３およびＧａｔｅフレーム１４を加入者側装置２に送信する（ステップＳＴ３４，３５）。Ｒｅｇｉｓｔｅｒフレーム１３とは、加入者側装置２にＩＤを割当てるＬＬＩＤを格納したフレームである。また、Ｇａｔｅフレーム１４とは、データ送信開始時間および継続時間を加入者側装置２に通知するフレームである。
　このステップＳＴ３４，３５では、まず、帯域割当制御部１０３は、次周期での各加入者側装置２のデータ送信開始時間および継続時間を決定し、ＧＡＩＮ保持部１１７およびフレーム制御部１０７に通知する。さらに、次周期でのＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報をセレクタ１１２，１１３および電源制御部１０４に通知する。 Next, the station side apparatus 1 transmits the Register frame 13 and the Gate frame 14 to the subscriber side apparatus 2 (steps ST34 and 35). The Register frame 13 is a frame in which an LLID for assigning an ID to the subscriber side device 2 is stored. The Gate frame 14 is a frame for notifying the subscriber side device 2 of the data transmission start time and duration.
In Steps ST34 and ST35, first, the bandwidth allocation control unit 103 determines the data transmission start time and duration of each subscriber side device 2 in the next cycle, and notifies the GAIN holding unit 117 and the frame control unit 107 of the data transmission start time and duration. . Furthermore, the Discovery Window information in the next cycle is notified to the selectors 112 and 113 and the power supply control unit 104.
　次に、フレーム制御部１０７は、Ｒｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム１２を認識した後、Ｒｅｇｉｓｔｅｒフレーム１３を生成する。また、帯域割当制御部１０３から通知された次周期での各加入者側装置２のデータ送信開始時間および継続時間に基づいて、Ｇａｔｅフレーム１４を生成する。この際、フレーム制御部１０７は、位相制御部１０５から抽出した位相情報をＲｅｇｉｓｔｅｒフレーム１３の空き領域に埋めこんだ位相情報通知フレームも生成する。例えば図４に示すように、Ｒｅｇｉｓｔｅｒフレーム１３のＰａｄ／Ｒｅｓｅｒｖｅｄの帯域に１ｂｙｔｅ分埋め込むことで位相情報通知フレームを生成する。 Next, the frame control unit 107 recognizes the Register Request frame 12 and then generates the Register frame 13. Further, the Gate frame 14 is generated based on the data transmission start time and duration of each subscriber-side device 2 in the next period notified from the bandwidth allocation control unit 103. At this time, the frame control unit 107 also generates a phase information notification frame in which the phase information extracted from the phase control unit 105 is embedded in an empty area of the Register frame 13. For example, as shown in FIG. 4, a phase information notification frame is generated by embedding 1 byte in the pad / reserved band of the register frame 13.
　次に、フレーム多重部１０９は、フレーム制御部１０７からの、位置情報通知フレームが埋め込まれたＲｅｇｉｓｔｅｒフレーム１３およびＧａｔｅフレーム１４と、下りバッファ部１０８からのＵｓｅｒフレームとを多重する。次に、光送信部１１０は、フレーム多重部１０９により多重されたフレームを光信号に変換し、ＷＤＭカプラ１０１および光スプリッタ４を介して対応する加入者側装置２に送信する。 Next, the frame multiplexing unit 109 multiplexes the Register frame 13 and the Gate frame 14 in which the position information notification frame is embedded from the frame control unit 107 and the User frame from the downlink buffer unit 108. Next, the optical transmission unit 110 converts the frame multiplexed by the frame multiplexing unit 109 into an optical signal, and transmits the optical signal to the corresponding subscriber side device 2 via the WDM coupler 101 and the optical splitter 4.
　次いで、加入者側装置２は、位相調整を行い、Ｒｅｇｉｓｔｅｒ　Ａｃｋフレーム１５を局側装置１に送信する（ステップＳＴ３６，３７）。Ｒｅｇｉｓｔｅｒ　Ａｃｋフレーム１５とは、加入者側装置２が登録完了を局側装置１に通知するフレームである。
　このステップＳＴ３６，３７では、まず、光受信部２０２は、ＷＤＭカプラ２０１を介して局側装置１からの下りデータを受信し、電気信号に変換する。次に、フレーム分離部２０３は、光受信部２０２により電気信号に変換されたデータをＵｓｅｒフレームと位置情報通知フレームが埋め込まれたＲｅｇｉｓｔｅｒフレーム１３とＧａｔｅフレーム１４とに分離する。次に、フレーム制御部２０４は、フレーム分離部２０３により分離されたＧａｔｅフレーム１４を認識した後、Ｒｅｇｉｓｔｅｒ　Ａｃｋフレーム１５を生成する。また、フレーム制御部２０４は、Ｒｅｇｉｓｔｅｒフレーム１３から位相情報通知フレームを抽出して、位相情報を位相制御部２０７に送信する。次に、フレーム多重部２０６は、フレーム制御部２０４からのＲｅｇｉｓｔｅｒ　Ａｃｋフレーム１５と上りバッファ部２０５からのＵｓｅｒフレームとを多重する。 Next, the subscriber side apparatus 2 performs phase adjustment, and transmits the Register Ack frame 15 to the station side apparatus 1 (steps ST36 and 37). The Register Ack frame 15 is a frame in which the subscriber side device 2 notifies the station side device 1 of the completion of registration.
In steps ST36 and 37, first, the optical receiving unit 202 receives downlink data from the station side device 1 via the WDM coupler 201 and converts it into an electrical signal. Next, the frame separation unit 203 separates the data converted into the electrical signal by the optical reception unit 202 into the Register frame 13 and the Gate frame 14 in which the User frame and the position information notification frame are embedded. Next, the frame control unit 204 recognizes the Gate frame 14 separated by the frame separation unit 203 and then generates a Register Ack frame 15. In addition, the frame control unit 204 extracts a phase information notification frame from the Register frame 13 and transmits the phase information to the phase control unit 207. Next, the frame multiplexing unit 206 multiplexes the Register Ack frame 15 from the frame control unit 204 and the User frame from the uplink buffer unit 205.
　次に、位相制御部２０７は、フレーム制御部２０４からの位相情報を用いて、光送信部２０８に送信されたフレームに対して位相調整を行う。次に、光送信部２０８は、フレーム多重部２０６により多重され、位相制御部２０７により位相調整されたフレームを光信号に変換し、ＷＤＭカプラ２０１および光スプリッタ４を介して局側装置１に送信する。 Next, the phase control unit 207 performs phase adjustment on the frame transmitted to the optical transmission unit 208 using the phase information from the frame control unit 204. Next, the optical transmission unit 208 converts the frame multiplexed by the frame multiplexing unit 206 and phase-adjusted by the phase control unit 207 into an optical signal, and transmits the optical signal to the station-side apparatus 1 via the WDM coupler 201 and the optical splitter 4. To do.
　次いで、局側装置１はＧＡＩＮ調整を行う（ステップＳＴ３８）。
　このステップＳＴ３８では、まず、Ｏ／Ｅ変換器１１１は、ＷＤＭカプラ１０１を介して加入者側装置２からの上りデータを受信し、電気信号に変換する。次に、セレクタ１１２，１１３は、帯域割当制御部１０３からのＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報に基づいて最初のｄｉｓｃｏｖｅｒｙ周期ではないと判断し、第２送信経路に切り替える。また、電源制御部１０４は、帯域割当制御部１０３からのＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報に基づいて、未使用ブロック（ＡＧＣ回路１１６およびＣＤＲ回路１１９）の電源をＯＦＦにして、省エネを図る。 Next, the station side apparatus 1 performs GAIN adjustment (step ST38).
In this step ST38, first, the O / E converter 111 receives the uplink data from the subscriber side device 2 via the WDM coupler 101 and converts it into an electrical signal. Next, the selectors 112 and 113 determine that it is not the first discovery cycle based on the Discovery Window information from the bandwidth allocation control unit 103, and switch to the second transmission path. Further, the power supply control unit 104 turns off the power of unused blocks (AGC circuit 116 and CDR circuit 119) based on the Discovery Window information from the band allocation control unit 103 to save energy.
　次に、ＧＡＩＮ回路１１８は、帯域割当制御部１０３から通知された各加入者側装置２のデータ送信開始時間および継続時間に基づいて、ＧＡＩＮ保持部１１７から該当するＧＡＩＮ量を抽出し、このＧＡＩＮ量を用いて、Ｏ／Ｅ変換器１１１からのデータに対してＧＡＩＮ調整を行う。次に、フレーム分離部１０６は、セレクタ１１３を介してＧＡＩＮ回路１１８から受信したデータをＵｓｅｒフレームとＲｅｇｉｓｔｅｒ　Ａｃｋフレーム１５とに分離する。このフレーム分離部１０６により分離されたＵｓｅｒフレームは上位装置６に送信され、Ｒｅｇｉｓｔｅｒ　Ａｃｋフレーム１５はフレーム制御部１０７に送信される。 Next, the GAIN circuit 118 extracts the corresponding GAIN amount from the GAIN holding unit 117 based on the data transmission start time and duration of each subscriber side device 2 notified from the band allocation control unit 103, and this GAIN The GAIN adjustment is performed on the data from the O / E converter 111 using the amount. Next, the frame separation unit 106 separates the data received from the GAIN circuit 118 via the selector 113 into the User frame and the Register Ack frame 15. The User frame separated by the frame separation unit 106 is transmitted to the host device 6, and the Register Ack frame 15 is transmitted to the frame control unit 107.
　その後、フレーム制御部１０７は、Ｒｅｇｉｓｔｅｒ　Ａｃｋフレーム１５を認識した後、Ｇａｔｅフレームを生成し、以後Ｇａｔｅ－Ｒｅｐｏｒｔシーケンスとなる。
　Ｇａｔｅ－Ｒｅｐｏｒｔシーケンスにおける光強度調整および位相調整では、最初のｄｉｓｃｏｖｅｒｙ周期で抽出したＧＡＩＮ量および位相調整量を反映させていく。 After that, the frame control unit 107 recognizes the Register Ack frame 15, generates a Gate frame, and then becomes a Gate-Report sequence.
In the light intensity adjustment and the phase adjustment in the Gate-Report sequence, the GAIN amount and the phase adjustment amount extracted in the first discovery cycle are reflected.
　ここで、従来の上りバーストフレームの構成を大きく分類すると、図５（ａ）に示すように、レーザ立ち上げ（Ｌｏｎ：Ｌａｓｅｒ　Ｏｎ）期間２０、光強度調整（ＡＧＣ）期間２１、位相調整（ＣＤＲ）期間２２、データ送信（Ｄａｔａ）期間２３、レーザ立ち下げ（Ｌｏｆｆ：Ｌａｓｅｒ　Ｏｆｆ）期間２４となる。ＡＧＣ期間２１およびＣＤＲ期間２２は同期期間（ＳｙｎｃＴｉｍｅ）２５であり、このＳｙｎｃＴｉｍｅ２５内ではデータを送信することはできない。 Here, when the configuration of the conventional uplink burst frame is roughly classified, as shown in FIG. 5A, a laser start (Lon: Laser On) period 20, a light intensity adjustment (AGC) period 21, and a phase adjustment (CDR) ) Period 22, data transmission (Data) period 23, and laser falling (Loff: Laser Off) period 24. The AGC period 21 and the CDR period 22 are a synchronization period (SyncTime) 25, and data cannot be transmitted within the SyncTime 25.
　従来のＰＯＮシステムでは、図５（ａ）に示すように、ＡＧＣ回路による光強度調整およびＣＤＲ回路による位相調整を毎周期行う必要があり、ＳｙｎｃＴｉｍｅ２５を毎周期設ける必要があるため、上り帯域の利用効率が低くなってしまう。それに対して、実施の形態１に係るＰＯＮシステムでは、図５（ｂ）に示すように、最初のｄｉｓｃｏｖｅｒｙ周期にのみＡＧＣ回路１１６による光強度調整およびＣＤＲ回路１１９による位相調整を行い、以後、抽出したＧＡＩＮ量および位相調整量を反映させている。そのため、最初のｄｉｓｃｏｖｅｒｙ周期以後のＳｙｎｃＴｉｍｅ２５を削除することができ、データ送信量を増加させることができるため、上り帯域の利用効率を向上させることができる。 In the conventional PON system, as shown in FIG. 5 (a), the light intensity adjustment by the AGC circuit and the phase adjustment by the CDR circuit need to be performed every cycle, and the SyncTime 25 needs to be provided every cycle. Efficiency will be low. On the other hand, in the PON system according to the first embodiment, as shown in FIG. 5B, the light intensity adjustment by the AGC circuit 116 and the phase adjustment by the CDR circuit 119 are performed only in the first discovery cycle, and thereafter extraction is performed. The GAIN amount and phase adjustment amount are reflected. For this reason, the SyncTime 25 after the first discovery cycle can be deleted, and the data transmission amount can be increased, so that the utilization efficiency of the upstream band can be improved.
　以上のように、この実施の形態１によれば、最初のｄｉｓｃｏｖｅｒｙ周期にのみＡＧＣ回路１１６による光強度調整およびＣＤＲ回路１１９による位相調整を行い、以後、抽出したＧＡＩＮ量および位相調整量を反映させるように構成したので、ＳｙｎｃＴｉｍｅを削除することができる。そのため、データ送信量を増加させることができ、上り帯域の利用効率を向上させることが可能となる。具体的には、加入者側装置２を１２８台接続した場合において、従来では、ＳｙｎｃＴｉｍｅ＝１．２μｓで上り帯域の利用効率が６５．８７％であったのに対して、ＳｙｎｃＴｉｍｅ＝０μｓにすることで、上り帯域の利用効率を７９．２４％まで向上させることが可能である。
　また、強度調整部１１４および位相調整部１１５の未使用ブロックの電源をＯＦＦにする電源制御部１０４を設けたので、省電力化を図ることもできる。 As described above, according to the first embodiment, light intensity adjustment by the AGC circuit 116 and phase adjustment by the CDR circuit 119 are performed only in the first discovery cycle, and the extracted GAIN amount and phase adjustment amount are reflected thereafter. Since it comprised so, SyncTime can be deleted. As a result, the amount of data transmission can be increased, and the utilization efficiency of the upstream band can be improved. Specifically, when 128 subscriber-side devices 2 are connected, conventionally, SyncTime = 1.2 μs and the upstream bandwidth utilization efficiency was 65.87%, whereas SyncTime = 0 μs. As a result, the utilization efficiency of the upstream band can be improved to 79.24%.
In addition, since the power control unit 104 that turns off the power of the unused blocks of the intensity adjustment unit 114 and the phase adjustment unit 115 is provided, power saving can be achieved.
　なお、実施の形態１に係るＰＯＮシステムでは、位相情報通知フレームをＲｅｇｉｓｔｅｒフレーム１３の空き領域に埋め込むようにして構成したが、これに限るものではなく、Ｇａｔｅフレーム１４の空き領域に埋め込むようにして構成してもよいし、位相情報通知フレームを別フォーマットのフレームとして構成してもよい。 In the PON system according to the first embodiment, the phase information notification frame is embedded in the free area of the Register frame 13. However, the present invention is not limited to this, and the phase information notification frame is embedded in the free area of the Gate frame 14. The phase information notification frame may be configured as a frame of another format.
　また、実施の形態１に係るＰＯＮシステムでは、最初のｄｉｓｃｏｖｅｒｙ周期にのみＡＧＣ回路１１６による光強度調整およびＣＤＲ回路１１９による位相調整を行うように構成したが、これに限るものではなく、例えばｄｉｓｃｏｖｅｒｙ周期毎など所定の周期毎にＡＧＣ回路１１６による光強度調整およびＣＤＲ回路１１９による位相調整を行うように構成してもよい。これにより、より安定した同期を実現することができる。 In the PON system according to the first embodiment, the light intensity adjustment by the AGC circuit 116 and the phase adjustment by the CDR circuit 119 are performed only in the first discovery cycle. However, the present invention is not limited to this. For example, the discovery cycle The light intensity adjustment by the AGC circuit 116 and the phase adjustment by the CDR circuit 119 may be performed at predetermined intervals such as every time. Thereby, more stable synchronization can be realized.
実施の形態２．
　実施の形態１では、最初のｄｉｓｃｏｖｅｒｙ周期で抽出したＧＡＩＮ量および位相制御量を用いて、以後のＧＡＩＮ調整および位相調整を行うように構成したが、実施の形態２は、ＧＡＩＮ量および位相制御量を毎周期更新する手法について述べる。 Embodiment 2. FIG.
In the first embodiment, the GAIN amount and the phase control amount extracted in the first discovery cycle are used to perform the subsequent GAIN adjustment and phase adjustment. In the second embodiment, the GAIN amount and the phase control amount are used. A method for updating the period is described.
　図６は実施の形態２に係るＰＯＮシステム内の各部の構成を示すブロック図である。
　図６に示す実施の形態２に係るＰＯＮシステムは、図２に示す実施の形態１における強度調整部１１４からＧＡＩＮ保持部１１７を削除し、光強度モニタ１２０およびＧＡＩＮ制御部（ＧＡＩＮ保持部）１２１を追加したものである。その他の構成は同様であり、同一の符号を付してその説明を省略する。 FIG. 6 is a block diagram showing the configuration of each part in the PON system according to the second embodiment.
In the PON system according to the second embodiment shown in FIG. 6, the GAIN holding unit 117 is deleted from the intensity adjusting unit 114 in the first embodiment shown in FIG. 2, and the light intensity monitor 120 and the GAIN control unit (GAIN holding unit) 121 are deleted. Is added. Other configurations are the same, and the same reference numerals are given and description thereof is omitted.
　光強度モニタ１２０は、セレクタ１１２を介してＯ／Ｅ変換器１１１から受信したデータに基づいて、ＧＡＩＮ調整に要するＧＡＩＮ量を算出するものである。この光強度モニタ１２０により、各加入者側装置２のデータに基づき算出されたＧＡＩＮ量を示すＧＡＩＮ情報は、ＧＡＩＮ制御部１２１に送信される。また、光強度モニタ１２０に入力されたデータはＧＡＩＮ回路１１８にそのまま送信される。 The light intensity monitor 120 calculates the GAIN amount required for the GAIN adjustment based on data received from the O / E converter 111 via the selector 112. The light intensity monitor 120 transmits GAIN information indicating the GAIN amount calculated based on the data of each subscriber side device 2 to the GAIN control unit 121. The data input to the light intensity monitor 120 is transmitted to the GAIN circuit 118 as it is.
　ＧＡＩＮ制御部１２１は、ＡＧＣ回路１１６または光強度モニタ１２０から受信した加入者側装置２毎のＧＡＩＮ情報を保持するものである。このＧＡＩＮ制御部１２１に保持されているＧＡＩＮ情報はＧＡＩＮ回路１１８により抽出される。 The GAIN control unit 121 holds GAIN information for each subscriber-side device 2 received from the AGC circuit 116 or the light intensity monitor 120. The GAIN information held in the GAIN control unit 121 is extracted by the GAIN circuit 118.
　なお、セレクタ１１２，１１３は、加入者側装置２との通信周期が最初のｄｉｓｃｏｖｅｒｙ周期の場合には、図６の第１送信経路（ＡＧＣ回路１１６およびＣＤＲ回路１１９を通過する送信経路）を選択し、最初のｄｉｓｃｏｖｅｒｙ周期以外の周期の場合には、第２送信経路（光強度モニタ１２０およびＧＡＩＮ回路１１８を通過し、ＣＤＲ回路１１９を通過して終端する経路とＣＤＲ回路１１９を通過しない経路とに分岐する送信経路）を選択する。 The selectors 112 and 113 select the first transmission path (transmission path that passes through the AGC circuit 116 and the CDR circuit 119) in FIG. 6 when the communication period with the subscriber side apparatus 2 is the first discovery period. In the case of a period other than the first discovery period, a second transmission path (a path that passes through the light intensity monitor 120 and the GAIN circuit 118, passes through the CDR circuit 119 and terminates, and a path that does not pass through the CDR circuit 119) Select the transmission route that branches to.
　また、ＧＡＩＮ回路１１８は、セレクタ１１２および光強度モニタ１２０を介してＯ／Ｅ変換器１１１から受信した今周期のデータに対して、ＧＡＩＮ制御部１２１から抽出した前周期のＧＡＩＮ量を用いてＧＡＩＮ調整を行う。このＧＡＩＮ回路１１８によりＧＡＩＮ調整されたデータは２つに分岐され、一方はＣＤＲ回路１１９に送信され、他方はセレクタ１１３を介してフレーム分離部１０６に送信される。
　また、ＣＤＲ回路１１９は、ＡＧＣ回路１１６またはＧＡＩＮ回路１１８から受信したデータに対して位相調整を行う。なお、ＡＧＣ回路１１６からのデータは、位相調整後、セレクタ１１３を介してフレーム分離部１０６に送信される。一方、ＧＡＩＮ回路１１８からのデータは、位相調整後、終端する。 In addition, the GAIN circuit 118 uses the GAIN amount of the previous cycle extracted from the GAIN control unit 121 for the current cycle data received from the O / E converter 111 via the selector 112 and the light intensity monitor 120 to perform the GAIN. Make adjustments. The data subjected to GAIN adjustment by the GAIN circuit 118 is branched into two, one being transmitted to the CDR circuit 119 and the other being transmitted to the frame separation unit 106 via the selector 113.
The CDR circuit 119 performs phase adjustment on the data received from the AGC circuit 116 or the GAIN circuit 118. Note that the data from the AGC circuit 116 is transmitted to the frame separation unit 106 via the selector 113 after phase adjustment. On the other hand, the data from the GAIN circuit 118 is terminated after the phase adjustment.
　次に、上記のように構成されたＰＯＮシステムの動作について説明する。
　図７はこの発明の実施の形態２に係るＰＯＮシステムの動作を示すシーケンス図である。なお、実施の形態２に係るＰＯＮシステムでは、位相同期を行う方法として、ＭＰＣＰのＤｉｓｃｏｖｅｒｙシーケンスを利用した場合について述べる。
　また、図７に示す実施の形態２に係るＰＯＮシステムのステップＳＴ７１，７２の動作は、図３に示す実施の形態１に係るＰＯＮシステムのステップＳＴ３１，３２の動作と同様であり、その説明を省略する。 Next, the operation of the PON system configured as described above will be described.
FIG. 7 is a sequence diagram showing the operation of the PON system according to Embodiment 2 of the present invention. In the PON system according to the second embodiment, a case where an MPCP Discovery sequence is used as a method for performing phase synchronization will be described.
Also, the operations of steps ST71 and 72 of the PON system according to Embodiment 2 shown in FIG. 7 are the same as the operations of Steps ST31 and 32 of the PON system according to Embodiment 1 shown in FIG. Omitted.
　ＰＯＮシステムの動作では、図７に示すように、ステップＳＴ７３において、局側装置１は、ＧＡＩＮ調整および位相調整を行い、ＧＡＩＮ情報および位相情報を取得する。
　このステップＳＴ７３では、まず、Ｏ／Ｅ変換器１１１は、ＷＤＭカプラ１０１を介して加入者側装置２からの上りデータを受信し、電気信号に変換する。次に、セレクタ１１２，１１３は、帯域割当制御部１０３からのＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報に基づいて最初のｄｉｓｃｏｖｅｒｙ周期であると判断し、第１送信経路を選択する。また、電源制御部１０４は、帯域割当制御部１０３からのＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報に基づいて、未使用ブロック（ＧＡＩＮ回路１１８および光強度モニタ１２０）の電源をＯＦＦにして、省エネを図る。 In the operation of the PON system, as shown in FIG. 7, in step ST73, the station apparatus 1 performs GAIN adjustment and phase adjustment, and acquires GAIN information and phase information.
In this step ST73, first, the O / E converter 111 receives the uplink data from the subscriber side apparatus 2 via the WDM coupler 101 and converts it into an electrical signal. Next, the selectors 112 and 113 determine that it is the first discovery cycle based on the Discovery Window information from the bandwidth allocation control unit 103, and select the first transmission path. Further, the power supply control unit 104 turns off power to unused blocks (the GAIN circuit 118 and the light intensity monitor 120) on the basis of the Discovery Window information from the band allocation control unit 103 to save energy.
　次に、ＡＧＣ回路１１６は、Ｏ／Ｅ変換器１１１からのデータに対してＧＡＩＮ調整を行う。このＡＧＣ回路１１６によるＧＡＩＮ情報はＧＡＩＮ制御部１２１に保持される。次に、ＣＤＲ回路１１９は、ＡＧＣ回路１１６によりＧＡＩＮ調整されたデータに対して位相調整を行う。このＣＤＲ回路１１９による位相情報は位相制御部１０５に保持される。
　次に、フレーム分離部１０６は、セレクタ１１３を介してＣＤＲ回路１１９から受信したデータをＵｓｅｒフレームとＲｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム１２とに分離する。このフレーム分離部１０６により分離されたＵｓｅｒフレームは上位装置６に送信され、Ｒｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム１２はフレーム制御部１０７に送信される。 Next, the AGC circuit 116 performs GAIN adjustment on the data from the O / E converter 111. The GAIN information by the AGC circuit 116 is held in the GAIN control unit 121. Next, the CDR circuit 119 performs phase adjustment on the data that has been GAIN adjusted by the AGC circuit 116. The phase information by the CDR circuit 119 is held in the phase control unit 105.
Next, the frame separation unit 106 separates the data received from the CDR circuit 119 via the selector 113 into the User frame and the Register Request frame 12. The User frame separated by the frame separation unit 106 is transmitted to the host device 6, and the Register Request frame 12 is transmitted to the frame control unit 107.
　次いで、局側装置１はＲｅｇｉｓｔｅｒフレーム１３およびＧａｔｅフレーム１４を加入者側装置２に送信する（ステップＳＴ７４，７５）。
　このステップＳＴ７４，７５では、まず、帯域割当制御部１０３は、次周期での各加入者側装置２のデータ送信開始時間および継続時間を決定し、ＧＡＩＮ制御部１２１およびフレーム制御部１０７に通知する。さらに、次周期でのＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報をセレクタ１１２，１１３および電源制御部１０４に通知する。 Next, the station side apparatus 1 transmits the Register frame 13 and the Gate frame 14 to the subscriber side apparatus 2 (steps ST74 and 75).
In Steps ST74 and 75, first, the bandwidth allocation control unit 103 determines the data transmission start time and duration of each subscriber side apparatus 2 in the next period, and notifies the GAIN control unit 121 and the frame control unit 107 of the data transmission start time and duration. . Furthermore, the Discovery Window information in the next cycle is notified to the selectors 112 and 113 and the power supply control unit 104.
　次に、フレーム制御部１０７は、Ｒｅｇｉｓｔｅｒ　Ｒｅｑｕｅｓｔフレーム１２を認識した後、Ｒｅｇｉｓｔｅｒフレーム１３を生成する。また、帯域割当制御部１０３から通知された次周期での各加入者側装置２のデータ送信開始時間および継続時間に基づいて、Ｇａｔｅフレーム１４を生成する。この際、フレーム制御部１０７は、位相制御部１０５から抽出した位相情報を、Ｇａｔｅフレーム１４の空き領域に埋めこんだ位相情報通知フレームも生成する。例えば図８に示すように、Ｇａｔｅフレーム１４のＰａｄ／Ｒｅｓｅｒｖｅｄの帯域に１ｂｙｔｅ分埋め込むことで位相情報通知フレームを生成する。 Next, the frame control unit 107 recognizes the Register Request frame 12 and then generates the Register frame 13. Further, the Gate frame 14 is generated based on the data transmission start time and duration of each subscriber-side device 2 in the next period notified from the bandwidth allocation control unit 103. At this time, the frame control unit 107 also generates a phase information notification frame in which the phase information extracted from the phase control unit 105 is embedded in an empty area of the Gate frame 14. For example, as shown in FIG. 8, the phase information notification frame is generated by embedding 1 byte in the Pad / Reserved band of the Gate frame 14.
　次に、フレーム多重部１０９は、フレーム制御部１０７からの、Ｒｅｇｉｓｔｅｒフレーム１３および位置情報通知フレームが埋め込まれたＧａｔｅフレーム１４と、下りバッファ部１０８からのＵｓｅｒフレームとを多重する。次に、光送信部１１０は、フレーム多重部１０９により多重されたフレームを光信号に変換し、ＷＤＭカプラ１０１および光スプリッタ４を介して対応する加入者側装置２に送信する。 Next, the frame multiplexing unit 109 multiplexes the Gate frame 14 embedded with the Register frame 13 and the position information notification frame from the frame control unit 107 and the User frame from the downlink buffer unit 108. Next, the optical transmission unit 110 converts the frame multiplexed by the frame multiplexing unit 109 into an optical signal, and transmits the optical signal to the corresponding subscriber side device 2 via the WDM coupler 101 and the optical splitter 4.
　次いで、加入者側装置２は、位相調整を行い、Ｒｅｇｉｓｔｅｒ　Ａｃｋフレーム１５を局側装置１に送信する（ステップＳＴ７６，７７）。
　このステップＳＴ７６，７７では、まず、光受信部２０２は、ＷＤＭカプラ２０１を介して局側装置１からの下りデータを受信し、電気信号に変換する。次に、フレーム分離部２０３は、光受信部２０２により電気信号に変換されたデータをＵｓｅｒフレームとＲｅｇｉｓｔｅｒフレーム１３と位置情報通知フレームが埋め込まれたＧａｔｅフレーム１４とに分離する。次に、フレーム制御部２０４は、フレーム分離部２０３により分離されたＧａｔｅフレーム１４を認識した後、Ｒｅｇｉｓｔｅｒ　Ａｃｋフレーム１５を生成する。また、フレーム制御部２０４は、Ｇａｔｅフレーム１４から位相情報通知フレームを抽出して、位相情報を位相制御部２０７に送信する。次に、フレーム多重部２０６は、フレーム制御部２０４からのＲｅｇｉｓｔｅｒ　Ａｃｋフレーム１５と上りバッファ部２０５からのＵｓｅｒフレームとを多重する。 Next, the subscriber side device 2 performs phase adjustment and transmits a Register Ack frame 15 to the station side device 1 (steps ST76 and 77).
In steps ST76 and 77, first, the optical receiving unit 202 receives downlink data from the station side device 1 via the WDM coupler 201 and converts it into an electrical signal. Next, the frame separation unit 203 separates the data converted into the electric signal by the optical reception unit 202 into the User frame, the Register frame 13 and the Gate frame 14 in which the position information notification frame is embedded. Next, the frame control unit 204 recognizes the Gate frame 14 separated by the frame separation unit 203 and then generates a Register Ack frame 15. Further, the frame control unit 204 extracts the phase information notification frame from the Gate frame 14 and transmits the phase information to the phase control unit 207. Next, the frame multiplexing unit 206 multiplexes the Register Ack frame 15 from the frame control unit 204 and the User frame from the uplink buffer unit 205.
　次に、位相制御部２０７は、フレーム制御部２０４からの位相情報を用いて、光送信部２０８に送信されたフレームに対して位相調整を行う。次に、光送信部２０８は、フレーム多重部２０６により多重され、位相制御部２０７により位相調整されたフレームを光信号に変換し、ＷＤＭカプラ２０１および光スプリッタ４を介して局側装置１に送信する。 Next, the phase control unit 207 performs phase adjustment on the frame transmitted to the optical transmission unit 208 using the phase information from the frame control unit 204. Next, the optical transmission unit 208 converts the frame multiplexed by the frame multiplexing unit 206 and phase-adjusted by the phase control unit 207 into an optical signal, and transmits the optical signal to the station-side apparatus 1 via the WDM coupler 201 and the optical splitter 4. To do.
　次いで、局側装置１は、ＧＡＩＮ調整を行い、ＧＡＩＮ量および位相調整量の更新を行う（ステップＳＴ７８）。
　このステップＳＴ７８では、まず、Ｏ／Ｅ変換器１１１は、ＷＤＭカプラ１０１を介して加入者側装置２からの上りデータを受信し、電気信号に変換する。次に、セレクタ１１２，１１３は、帯域割当制御部１０３からのＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報に基づいて最初のｄｉｓｃｏｖｅｒｙ周期ではないと判断し、第２送信経路に切り替える。また、電源制御部１０４は、帯域割当制御部１０３からのＤｉｓｃｏｖｅｒｙ　Ｗｉｎｄｏｗ情報に基づいて未使用ブロック（ＡＧＣ回路１１６）の電源をＯＦＦにして、省エネを図る。 Next, the station apparatus 1 performs GAIN adjustment and updates the GAIN amount and the phase adjustment amount (step ST78).
In this step ST78, first, the O / E converter 111 receives the uplink data from the subscriber side apparatus 2 via the WDM coupler 101 and converts it into an electrical signal. Next, the selectors 112 and 113 determine that it is not the first discovery cycle based on the Discovery Window information from the bandwidth allocation control unit 103, and switch to the second transmission path. Further, the power control unit 104 turns off the power of the unused block (AGC circuit 116) based on the Discovery Window information from the band allocation control unit 103 to save energy.
　次に、光強度モニタ１２０は、セレクタ１１２を介してＯ／Ｅ変換器１１１から受信したデータに基づいて、ＧＡＩＮ調整に要するＧＡＩＮ量を算出し、ＧＡＩＮ情報をＧＡＩＮ制御部１２１に通知する。また、光強度モニタ１２０に入力したデータはＧＡＩＮ回路１１８にそのまま送信される。
　次に、ＧＡＩＮ回路１１８は、帯域割当制御部１０３から通知された各加入者側装置２のデータ送信開始時間および継続時間に基づいて、ＧＡＩＮ制御部１２１から該当する前周期のＧＡＩＮ量を抽出し、このＧＡＩＮ量を用いて、光強度モニタ１２０を介してＯ／Ｅ変換器１１１から受信した今周期のデータに対してＧＡＩＮ調整を行う。このＧＡＩＮ回路１１８によりＧＡＩＮ調整されたデータは２つに分岐され、一方はＣＤＲ回路１１９に送信され、他方はセレクタ１１３を介してフレーム分離部１０６に送信される。
　次に、ＧＡＩＮ制御部１２１は、光強度モニタ１２０からの今周期のＧＡＩＮ情報を、保持している前周期のＧＡＩＮ情報に上書きすることによって、ＧＡＩＮ情報の更新を行う。 Next, the light intensity monitor 120 calculates the GAIN amount required for the GAIN adjustment based on the data received from the O / E converter 111 via the selector 112 and notifies the GAIN control unit 121 of the GAIN information. The data input to the light intensity monitor 120 is transmitted to the GAIN circuit 118 as it is.
Next, the GAIN circuit 118 extracts the GAIN amount of the corresponding previous period from the GAIN control unit 121 based on the data transmission start time and duration of each subscriber side device 2 notified from the band allocation control unit 103. Using this GAIN amount, GAIN adjustment is performed on the data of the current cycle received from the O / E converter 111 via the light intensity monitor 120. The data subjected to GAIN adjustment by the GAIN circuit 118 is branched into two, one being transmitted to the CDR circuit 119 and the other being transmitted to the frame separation unit 106 via the selector 113.
Next, the GAIN control unit 121 updates the GAIN information by overwriting the GAIN information of the current cycle from the light intensity monitor 120 with the GAIN information of the previous cycle held.
　次に、ＣＤＲ回路１１９は、ＧＡＩＮ回路１１８から受信したデータに基づいて、位相調整量を抽出し、位相情報を位相制御部１０５に通知して終端する。次に、位相制御部１０５は、ＣＤＲ回路１１９からの今周期の位相情報を、保持している前周期の位相情報に上書きすることにより、位相情報の更新を行う。 Next, the CDR circuit 119 extracts the phase adjustment amount based on the data received from the GAIN circuit 118, notifies the phase information to the phase control unit 105, and terminates. Next, the phase control unit 105 updates the phase information by overwriting the phase information of the current cycle from the CDR circuit 119 over the held previous phase information.
　次に、フレーム分離部１０６は、セレクタ１１３を介してＧＡＩＮ回路１１８から受信したデータをＵｓｅｒフレームとＲｅｇｉｓｔｅｒ　Ａｃｋフレーム１５とに分離する。このフレーム分離部１０６により分離されたＵｓｅｒフレームは上位装置６に送信され、Ｒｅｇｉｓｔｅｒ　Ａｃｋフレーム１５はフレーム制御部１０７に送信される。 Next, the frame separation unit 106 separates the data received from the GAIN circuit 118 via the selector 113 into the User frame and the Register Ack frame 15. The User frame separated by the frame separation unit 106 is transmitted to the host device 6, and the Register Ack frame 15 is transmitted to the frame control unit 107.
　その後、フレーム制御部１０７は、Ｒｅｇｉｓｔｅｒ　Ａｃｋフレーム１５を認識した後、Ｇａｔｅフレーム１４を生成し、以後Ｇａｔｅ－Ｒｅｐｏｒｔシーケンスとなる。
　Ｇａｔｅ－Ｒｅｐｏｒｔシーケンスにおいて、光強度調整では、光強度モニタ１２０により算出した今周期でのＧＡＩＮ量を、次周期のＧＡＩＮ回路１１８に反映させることでＧＡＩＮ量の更新を毎周期行う。また、位相調整では、ＣＤＲ回路１１９により抽出した位相調整量を毎周期ＯＮＵ５に送信することで位相調整量の更新を毎周期行う。 After that, the frame control unit 107 recognizes the Register Ack frame 15 and then generates the Gate frame 14, and thereafter becomes a Gate-Report sequence.
In the Gate-Report sequence, in the light intensity adjustment, the GAIN amount in the current cycle calculated by the light intensity monitor 120 is reflected in the GAIN circuit 118 in the next cycle, so that the GAIN amount is updated every cycle. In the phase adjustment, the phase adjustment amount is updated every cycle by transmitting the phase adjustment amount extracted by the CDR circuit 119 to the ONU 5 every cycle.
　以上のように、実施の形態２によれば、ＧＡＩＮ量および位相調整量を毎周期更新するように構成したので、実施の形態１における効果に加えて、安定した同期を実現することができる。 As described above, according to the second embodiment, since the GAIN amount and the phase adjustment amount are updated every cycle, in addition to the effects in the first embodiment, stable synchronization can be realized.
　なお、図６に示す実施の形態２に係るＰＯＮシステムでは、セレクタ１１２，１１３が第２送信経路に切り替えた場合に、各加入者側装置２からのデータが光強度モニタ１２０を通過してＧＡＩＮ回路１１８に送信される場合について示したが、例えば図９に示すように、光強度モニタ１２０の前段でデータを２つに分岐させて、一方のデータをＧＡＩＮ回路１１８に入力させて、前周期のＧＡＩＮ量を用いたＧＡＩＮ調整を行わせ、他方のデータを光強度モニタ１２０に入力させて、今周期のＧＡＩＮ量の算出を行わせるように構成してもよい。 In the PON system according to the second embodiment shown in FIG. 6, when the selectors 112 and 113 are switched to the second transmission path, the data from each subscriber side device 2 passes through the light intensity monitor 120 and GAIN. As shown in FIG. 9, for example, as shown in FIG. 9, the data is branched into two at the front stage of the light intensity monitor 120, and one data is input to the GAIN circuit 118. The GAIN adjustment using the GAIN amount may be performed, and the other data may be input to the light intensity monitor 120 to calculate the GAIN amount for the current cycle.
　また、実施の形態２に係るＰＯＮシステムでは、ＧＡＩＮ量の更新を毎周期行うように構成したが、これに限るものではなく、ＧＡＩＮ量の更新は所定の事象が発生した場合にのみ行うように構成してもよい。例えば、ＧＡＩＮ制御部１２１にて、保持している前周期のＧＡＩＮ量と光強度モニタ１２０により算出された今周期のＧＡＩＮ量との差を所定の閾値と比較し、差が閾値以上である場合に、ＡＧＣ回路１１６によるＧＡＩＮ再調整を行うように構成してもよい。 In the PON system according to the second embodiment, the GAIN amount is updated every cycle. However, the present invention is not limited to this, and the GAIN amount is updated only when a predetermined event occurs. It may be configured. For example, when the GAIN control unit 121 compares the difference between the GAIN amount held in the previous cycle and the GAIN amount in the current cycle calculated by the light intensity monitor 120 with a predetermined threshold, and the difference is equal to or greater than the threshold. In addition, the GAIN readjustment by the AGC circuit 116 may be performed.
　また、実施の形態１，２に係るＰＯＮシステムでは、位相同期の方法としてＭＰＣＰシーケンスを用いて説明を行ったが、これに限るものではなく、ＰＯＮシステムで規定されているＯＡＭに適用させてもよいし、ＰＯＮシステムでは規定されていない独自のシーケンスに適用させてもよい。 In the PON system according to the first and second embodiments, the MPCP sequence has been described as the phase synchronization method. However, the present invention is not limited to this, and may be applied to the OAM defined in the PON system. Alternatively, it may be applied to a unique sequence that is not defined in the PON system.
　また、実施の形態１，２では、ＰＯＮシステムを用いて説明を行ったが、これに限るものではなく、その他の一般的な光通信システムにも同様に適用可能である。
　なお、本願発明はその発明の範囲内において、各実施の形態の自由な組み合わせ、あるいは各実施の形態の任意の構成要素の変形、もしくは各実施の形態において任意の構成要素の省略が可能である。 Moreover, although Embodiment 1 and 2 demonstrated using the PON system, it is not restricted to this, It can apply similarly to another general optical communication system.
In the present invention, within the scope of the invention, any combination of the embodiments, any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .
　この発明に係る局側装置は、ＡＧＣ期間を削除することでＳｙｎｃＴｉｍｅを削減することができ、上り帯域利用効率を向上させることができ、複数の加入者側装置との間で通信を行う局側装置などに用いるのに適している。 The station side apparatus according to the present invention can reduce the SyncTime by deleting the AGC period, can improve the uplink bandwidth utilization efficiency, and communicates with a plurality of subscriber side apparatuses. Suitable for use in devices.

Claims (5)

  1. 　複数の加入者側装置との間で通信を行う局側装置において、
    　前記各加入者側装置から受信したデータに対してＧＡＩＮ調整を行うＡＧＣ（Ａｕｔｏｍａｔｉｃ　Ｇａｉｎ　Ｃｏｎｔｒｏｌ）回路と、
    　前記ＡＧＣ回路によるＧＡＩＮ調整で用いられたＧＡＩＮ量を保持するＧＡＩＮ保持部と、
    　前記各加入者側装置から受信したデータに対して、前記ＧＡＩＮ保持部に保持されているＧＡＩＮ量を用いてＧＡＩＮ調整を行うＧＡＩＮ回路と、
    　前記各加入者側装置から受信したデータの送信経路として、前記ＡＧＣ回路を通過する送信経路または前記ＧＡＩＮ回路を通過する送信経路を選択するセレクタと
    を備えたことを特徴とする局側装置。     In a station side device that communicates with a plurality of subscriber side devices,
    An AGC (Automatic Gain Control) circuit that performs GAIN adjustment on data received from each of the subscriber side devices;
    A GAIN holding unit for holding the GAIN amount used in the GAIN adjustment by the AGC circuit;
    A GAIN circuit that performs GAIN adjustment on the data received from each of the subscriber side devices using the GAIN amount held in the GAIN holding unit;
    A station-side apparatus comprising: a selector that selects a transmission path that passes through the AGC circuit or a transmission path that passes through the GAIN circuit as a transmission path of data received from each subscriber-side apparatus.
  2. 　前記セレクタにより選択されていない送信経路上の未使用ブロックの電源をＯＦＦにする電源制御部をさらに備えた
    ことを特徴とする請求項１記載の局側装置。     The station-side apparatus according to claim 1, further comprising a power control unit that turns off power to an unused block on a transmission path that is not selected by the selector.
  3. 　前記セレクタは、前記加入者側装置との通信周期が最初のｄｉｓｃｏｖｅｒｙ周期の場合には、前記ＡＧＣ回路を通過する送信経路を選択し、当該最初のｄｉｓｃｏｖｅｒｙ周期以外の周期の場合には、前記ＧＡＩＮ回路を通過する送信経路を選択する
    ことを特徴とする請求項１記載の局側装置。     The selector selects a transmission path that passes through the AGC circuit when the communication cycle with the subscriber-side device is the first discovery cycle, and the GAIN when the cycle is other than the first discovery cycle. 2. The station side apparatus according to claim 1, wherein a transmission path passing through the circuit is selected.
  4. 　前記セレクタは、所定の周期ごとに前記ＡＧＣ回路を通過する送信経路を選択する
    ことを特徴とする請求項１記載の局側装置。     The station-side apparatus according to claim 1, wherein the selector selects a transmission path that passes through the AGC circuit every predetermined period.
  5. 　前記各加入者側装置から受信したデータに基づいて、ＧＡＩＮ調整に要するＧＡＩＮ量を算出する光強度モニタをさらに備え、
    　前記ＧＡＩＮ保持部は、前記ＡＧＣ回路により用いられたＧＡＩＮ量または前記光強度モニタにより算出されたＧＡＩＮ量を保持し、
    　前記ＧＡＩＮ回路は、前記各加入者側装置から受信した今周期のデータに対して、前記ＧＡＩＮ保持部に保持されている前周期のＧＡＩＮ量を用いてＧＡＩＮ調整を行い、
    　前記セレクタは、前記加入者側装置との通信周期が最初のｄｉｓｃｏｖｅｒｙ周期の場合には、前記ＡＧＣ回路を通過する送信経路を選択し、当該最初のｄｉｓｃｏｖｅｒｙ周期以外の周期の場合には、前記光強度モニタおよびＧＡＩＮ回路を通過する送信経路を選択する
    ことを特徴とする請求項１記載の局側装置。     A light intensity monitor that calculates a GAIN amount required for GAIN adjustment based on data received from each of the subscriber side devices;
    The GAIN holding unit holds the GAIN amount used by the AGC circuit or the GAIN amount calculated by the light intensity monitor,
    The GAIN circuit performs GAIN adjustment using the GAIN amount of the previous cycle held in the GAIN holding unit for the current cycle data received from each of the subscriber side devices,
    The selector selects a transmission path that passes through the AGC circuit when the communication period with the subscriber-side device is the first discovery period, and when the communication period with the subscriber-side apparatus is a period other than the first discovery period, 2. The station side apparatus according to claim 1, wherein a transmission path passing through the intensity monitor and the GAIN circuit is selected.
PCT/JP2010/006035 2010-10-08 2010-10-08 Station-side device WO2012046281A1 (en)

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