CN102045610A - Optical signal transmission method and device, and passive optical network - Google Patents
Optical signal transmission method and device, and passive optical network Download PDFInfo
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- CN102045610A CN102045610A CN2011100070867A CN201110007086A CN102045610A CN 102045610 A CN102045610 A CN 102045610A CN 2011100070867 A CN2011100070867 A CN 2011100070867A CN 201110007086 A CN201110007086 A CN 201110007086A CN 102045610 A CN102045610 A CN 102045610A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
- H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
- H04J14/0232—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON] for downstream transmission
- H04J14/0234—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON] for downstream transmission using multiple wavelengths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0247—Sharing one wavelength for at least a group of ONUs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/0252—Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J2014/0253—Allocation of downstream wavelengths for upstream transmission
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Abstract
The invention discloses an optical signal transmission method and device, and a passive optical network. The method comprises the following steps: an ONU (Optical Network Unit) receives a downlink frame from an OLT (Optical Line Terminal), wherein the downlink frame is used for indicating the state information of wavelength channels; the ONU determines an idle wavelength channel according to the downlink frame; and the ONU carries out wavelength registration with the OLT on the idle wavelength channel, and transmits optical signals after the wavelength registration is successful. The invention increases the resource utilization ratio of optical signal transmission and simplifies the registration process.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of optical signal transmission method, device and EPON.
Background technology
Wave division multiplexing passive optical network (Wavelength Division Multiplexing-Passive Optical Network, abbreviate WDM-PON as) be a kind of novel passive optical network system that is suggested recently based on the transmission of multi-wavelength single fiber, operation principle is, each terminal use takies a wavelength channel separately, and a plurality of wavelength channels transmit in same trunk fiber by the mode of wavelength division multiplexing.Be characterized in that each terminal use exclusively enjoys a wavelength bandwidth resource.This makes that not only the bandwidth that offers the individual consumer greatly improves, and has made full use of the wavelength bandwidth resource of optical fiber, has greatly expanded the total bandwidth of EPON.
Though WDM-PON has many advantages,, cost is higher to be a main difficulty of restriction WDM-PON development always.In order to reduce the network construction cost of WDM-PON, industry generally recommends to adopt " colourless " ONU scheme, promptly will allow all users' the ONU be unified, does not have difference mutually.Can significantly reduce networking and the maintenance cost of WDM-PON like this.At present, injection locking F-PLD, RSOA and tunable laser are topmost three kinds of non-colored light network element (Optical Network Unit abbreviates ONU as) implementations, and wherein tunable laser is that transmission performance is best, the simplest a kind of scheme of networking.Because tunable laser is with respect to injection locking formula FP laser (ILF-PLD), reflective semiconductor optical amplifier (RSOA), be that a kind of active wavelength is selected output device, therefore, need OLT to carry out unified wavelength initialization scheduling and allocation manager.For this reason, the someone proposes when the ONU initialization tunable laser unification to be arranged on a fixed wave length, registers by the mode of traditional TDM, after registration is finished, switches to different separately operation wavelengths again.Though the problem of wavelength conflict when utilizing this method can solve the ONU initialization,, ONU needs operation wavelength is reset to the unified wavelength of registering usefulness when dispatching from the factory or after the each outage of ONU, has increased wavelength tuning number of times and wavelength management difficulty.And registration has taken user's wavelength channel, and the serial logon mode also makes registration process consuming time very long.
The problem of and register flow path more complicated lower at optical transmission method resource utilization in the correlation technique does not propose effective solution at present as yet.
Summary of the invention
Main purpose of the present invention is to provide a kind of optical signal transmission method, device and EPON, to solve the problem of the lower and register flow path more complicated of optical signal transmission method resource utilization in the above-mentioned correlation technique at least.
According to an aspect of the present invention, provide a kind of optical signal transmission method.
Optical signal transmission method according to the present invention comprises: ONU receives the downlink frame from OLT, and wherein, downlink frame is used in reference to the state information of oscillography long-channel; ONU determines idle wavelength channel according to downlink frame; ONU carries out ONU registration with OLT on the wavelength channel of free time, and in the ONU laggard industry transmission of being engaged in of succeeding in registration.
Further, the downlink frame that ONU receives from OLT comprises: ONU receives downlink frame from OLT and comprises one of following: when distant-end node uses wavelength division multiplex device, ONU uses the registed authorization frame of wide range optical receiver reception from OLT, wherein, the registed authorization frame indicates the state of the wavelength channel at its place to be the free time; Distant-end node uses common optical splitter, ONU uses registed authorization frame or the traffic frame of adjustable receiver reception from OLT, wherein, the registed authorization frame indicates the state of wavelength channel at its place for idle, and the state of wavelength channel that traffic frame carries the wavelength channel state information and indicates its place is for occupying; When distant-end node uses common optical splitter, ONU uses tunable laser to send local oscillator light to coherent receiver, use registed authorization frame or the traffic frame of coherent receiver reception from OLT, wherein, the registed authorization frame indicates the state of the wavelength channel at its place to be the free time, traffic frame carries the state information of wavelength channel, and the state of wavelength channel of indicating its place is for occupying.
Further, ONU determines that according to downlink frame idle wavelength channel comprises: OLT determines that the wavelength channel at registed authorization frame place is for idle wavelength channel or according to the definite idle wavelength channel of the state information of traffic frame medium wavelength passage.
Further, ONU carries out ONU registration with OLT on the wavelength channel of free time, and comprises in the ONU laggard industry transmission of being engaged in of succeeding in registration: ONU determine its current wavelength for idle wavelength channel or the state information of the wavelength channel that carries in according to traffic frame it is adjusted into idle wavelength channel; ONU sends registration request frame after receiving the registed authorization frame of OLT transmission on the wavelength channel of free time; ONU sends affirmation feedback frame to OLT behind the accreditation verification frame that receives the OLT transmission, the industry of going forward side by side is engaged in transmitting.
Further, before the downlink frame of ONU reception from optical line terminal OLT, also comprise: OLT determines the state of all wavelengths passage, and generation wavelength management souvenir carries the state of all wavelengths passage, and regularly send the registed authorization frame to all idle wavelength channels, wherein state comprises: take or the free time; ONU carries out wavelength registration with OLT on the wavelength channel of free time, and in the described ONU laggard industry transmission of being engaged in of succeeding in registration; Also comprise: OLT with the status modifier of wavelength channel in the wavelength management table of above-mentioned free time for occupying.
Further, registration request frame uses burst form to send; Idle wavelength is carried out time period that registration request frame that ONU registration and a plurality of ONU send arrives OLT simultaneously by a plurality of ONU to be had when overlapping, and a plurality of ONU send registration request frame after waiting for random times once more.
Further, also comprise: OLT carries the data of the channel status of the current idler long-channel in the wavelength management table in the accreditation verification frame.
Further, also comprise: ONU judges respectively whether the sequence number and the sequence number of himself that carry in the accreditation verification frame be identical; If judged result then sends to OLT and confirms the feedback frame for being, otherwise, carry out wavelength according to the current idle channel data of carrying in the accreditation verification frame and switch.
According to a further aspect in the invention, provide a kind of ONU.
ONU according to the present invention comprises: receiver module, be used to receive downlink frame from optical line terminal OLT, and wherein, downlink frame is used in reference to the state information of oscillography long-channel; Determination module is used for determining that ONU determines idle wavelength channel according to downlink frame; First Registering modules is used for carrying out the ONU registration with OLT on the wavelength channel of free time; Second transport module is used for the laggard traveling optical signal transmission of succeeding in registration at ONU.
Further, receiver module is used for the downlink frame that receives from OLT by one of following: when distant-end node used wavelength division multiplex device, ONU used the wide range optical receiver to receive registed authorization frame from OLT, wherein, the registed authorization frame indicates the state of the wavelength channel at its place to be the free time:
When distant-end node uses common optical splitter, ONU uses registed authorization frame or the traffic frame of adjustable receiver reception from OLT, wherein, the registed authorization frame indicates the state of the wavelength channel at its place to be the free time, traffic frame carries the state information of wavelength channel, and the state of wavelength channel of indicating its place is for occupying; Or
When distant-end node uses common optical splitter, ONU sends local oscillator light by the tunable laser on it to coherent receiver, use registed authorization frame or the traffic frame of coherent receiver reception from OLT, wherein, the registed authorization frame indicates the state of the wavelength channel at its place to be the free time, traffic frame carries the state information of wavelength channel, and the state of wavelength channel of indicating its place is for occupying.
Further, determination module is used for determining that the wavelength channel at registed authorization frame place is for idle wavelength channel or according to the definite idle wavelength channel of the state information of traffic frame medium wavelength passage.
Further, Registering modules comprises: the wavelength determination module is used for determining that the state information of the wavelength channel that the current wavelength of the ONU at its place is carried for idle wavelength channel or according to traffic frame is adjusted into idle wavelength channel with it; The registration request frame sending module is used for sending registration request frame after receiving the registed authorization frame of OLT transmission on the wavelength channel of free time; Confirm sending module, be used for behind the accreditation verification frame that receives the OLT transmission, send to OLT and confirm the feedback frame.
In accordance with a further aspect of the present invention, also provide a kind of OLT.
OLT according to the present invention comprises: sending module, be used for sending downlink frame to optical network unit ONU, and wherein, downlink frame is used in reference to the state information of oscillography long-channel; Second Registering modules is used for carrying out the ONU registration with ONU on the wavelength channel of the free time that ONU determines; Second transport module is used for the laggard industry transmission of being engaged in of succeeding in registration at ONU.
According to another aspect of the invention, also provide a kind of EPON.
EPON according to the present invention comprises: above-mentioned ONU and above-mentioned OLT.
By the present invention, adopt the downlink frame of ONU reception from the state information that is used in reference to the oscillography long-channel of OLT, determine idle wavelength channel according to downlink frame, and on the wavelength channel of free time, register, solved the problem of the lower and register flow path more complicated of the resource utilization of optical signal transmission method in the correlation technique, and then reached and improve the resource utilization of optical signal transmission and simplified register flow path.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the optical signal transmission method of the embodiment of the invention;
Fig. 2 is that ONU registers and the Wavelength Assignment flow chart according to the preferred embodiment of the invention;
Fig. 3 is a WDM-PON system schematic of using tunable laser and wide range receiver according to the ONU of the embodiment of the invention;
Fig. 4 is according to the ONU of the embodiment of the invention and OLT log-on message reciprocal process schematic diagram one;
Fig. 5 is a WDM-PON system schematic of using tunable laser and adjustable receiver according to the ONU of the embodiment of the invention;
Fig. 6 is according to the ONU of the embodiment of the invention and OLT log-on message reciprocal process schematic diagram two;
Fig. 7 is a WDM-PON system schematic of using tunable laser and coherent receiver according to the ONU of the embodiment of the invention;
Fig. 8 is the structured flowchart according to the ONU of the embodiment of the invention;
Fig. 9 is the preferred construction block diagram according to the ONU of the embodiment of the invention;
Figure 10 is the structured flowchart according to the ONU of the embodiment of the invention; And
Figure 11 is the structured flowchart according to the EPON of the embodiment of the invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Present embodiment provides a kind of optical signal transmission method, and Fig. 1 is the flow chart according to the optical signal transmission method of the embodiment of the invention, and as shown in Figure 1, this method comprises:
Step S102:ONU receives the downlink frame from OLT, and wherein, downlink frame is used in reference to the state information of oscillography long-channel;
Step S104:ONU determines idle wavelength channel according to downlink frame;
Step S106:ONU carries out ONU registration with OLT on the wavelength channel of free time, and in the ONU laggard industry transmission of being engaged in of succeeding in registration.
Preferably, the downlink frame that ONU receives from OLT comprises: ONU receives downlink frame from OLT and comprises one of following: when distant-end node uses wavelength division multiplex device, ONU uses the registed authorization frame of wide range optical receiver reception from OLT, wherein, the registed authorization frame indicates the state of wavelength channel at its place for idle: when distant-end node uses common optical splitter, ONU uses registed authorization frame or the traffic frame of adjustable receiver reception from OLT, wherein, the registed authorization frame indicates the state of the wavelength channel at its place to be the free time, traffic frame carries the state information of wavelength channel, and the state of wavelength channel of indicating its place is for occupying; When distant-end node uses common optical splitter, ONU sends local oscillator light by the tunable laser on it to coherent receiver, use registed authorization frame or the traffic frame of coherent receiver reception from OLT, wherein, the registed authorization frame indicates the state of the wavelength channel at its place to be the free time, traffic frame carries the state information of wavelength channel, and the wavelength channel of indicating its place is for occupying.
Preferably, ONU determines that according to downlink frame idle wavelength channel comprises: OLT determines that the wavelength channel at registed authorization frame place is for idle wavelength channel or according to the definite idle wavelength channel of the state information of traffic frame medium wavelength passage.
Preferably, ONU carries out ONU registration with OLT on the wavelength channel of free time, and comprises in the ONU laggard industry transmission of being engaged in of succeeding in registration: ONU determine its current wavelength for idle wavelength channel or the state information of the wavelength channel that carries in according to traffic frame it is adjusted into idle wavelength channel; ONU sends registration request frame after receiving the registed authorization frame of OLT transmission on the wavelength channel of free time; ONU sends affirmation feedback frame to OLT behind the accreditation verification frame that receives the OLT transmission, the industry of going forward side by side is engaged in transmitting.
Preferably, before the downlink frame of ONU reception from optical line terminal OLT, also comprise: OLT determines the state of all wavelengths passage, and generation wavelength management souvenir carries the state of all wavelengths passage, and regularly send the registed authorization frame to all idle wavelength channels, wherein state comprises: take or the free time; On the wavelength channel of ONU, carry out ONU registration, and after ONU succeeds in registration laggard traveling optical signal transmission, also comprise with OLT in the free time: OLT with the status modifier of wavelength channel in the wavelength management table of free time for occupying.
Preferably, registration request frame uses burst form to send; Idle wavelength is carried out time period that registration request frame that ONU registration and a plurality of ONU send arrives OLT simultaneously by a plurality of ONU to be had when overlapping, and a plurality of ONU send registration request frame after waiting for random times once more.
Preferably, said method also comprises: OLT carries the data of the channel status of the current idler long-channel in the wavelength management table in the accreditation verification frame.
Preferably, said method also comprises: ONU judges respectively whether the sequence number and the sequence number of himself that carry in the accreditation verification frame be identical; If judged result is for being, then send and confirm the feedback frame to OLT, otherwise, carry out wavelength according to the data of the channel status of the current idle channel that carries in the accreditation verification frame and switch.
Embodiment one
Present embodiment provides a kind of WDM-PON ONU initialization and Wavelength allocation method that is applicable to tunable laser.Present embodiment combines the foregoing description and preferred implementation wherein, and this method comprises:
Step 1: optical network unit (Optical Network Unit abbreviates ONU as) powers on, and waits for receiving downstream signal.Optical line terminal (Optical Line Terminal abbreviates OLT as) OLT internal wavelength admin table comprises the occupied or idle information of wavelength channel, and each wavelength channel comprises a pair of corresponding uplink and downlink wavelength.OLT passes to ONU with the wavelength channel state information by downlink frame.ONU carries out necessary adjustment according to the wavelength channel state information to the operation wavelength of tunable laser, makes it be operated in the idler long-channel.
It is mutual that step 2:ONU and OLT carry out log-on message at the idler long-channel, finishes registration and Wavelength Assignment process.
After step 3:ONU registration was finished, OLT upgraded wavelength management table information, and ONU and OLT begin to send mutually the regular traffic frame, carry out regular traffic communication.
Preferably, in step 1, if distant-end node uses wavelength division multiplex device, ONU uses the wide range optical receiver, what then ONU received at the beginning is the registed authorization frame of this wavelength channel, if tunable laser then need not to adjust wavelength at this wavelength channel, otherwise ONU needs tunable laser is adjusted to corresponding wavelength channel.
Preferably, in step 1, if distant-end node uses common optical splitter, ONU uses adjustable receiver, and then the initial reception of ONU may be the registed authorization frame, and at this moment ONU need not regulate the operation wavelength of tunable laser.Also may be the regular traffic frame, comprise the wavelength channel state information in the regular traffic frame.ONU receives the wavelength adjusted in concert to idle wavelength channel according to wavelength channel information with tunable laser emission wavelength and adjustable receiver.
Preferably, in step 1, if distant-end node uses common optical splitter, ONU uses coherent receiver, and the tunable laser of ONU is only launched light to coherent receiver when then initial, and ONU itself does not export light.This process can add optical switch and realize by the output at tunable laser, also can realize by external modulator.What ONU initially received may be the registed authorization frame, and at this moment ONU need not regulate the operation wavelength of tunable laser.Also may be the regular traffic frame, comprise the wavelength channel state information in the regular traffic frame.ONU is adjusted to idle wavelength channel according to wavelength channel information with the tunable laser emission wavelength, but still only to coherent receiver emission light.
Preferably, because when the situation that the idler long-channel may exist a plurality of ONU to register simultaneously, so in the step 2, the protocol frame of sending out on the adjustable receiver must be a burst form.
Preferably, because when the situation that the idler long-channel may exist a plurality of ONU to register simultaneously, therefore in the step 2, after all ONU receive the registed authorization frame, all can send registration request frame to OLT, if a plurality of registration request frame arrive the time of OLT and clash, then claim frame is invalid, and ONU sends after the registration request frame through one period stand-by period, if do not receive the accreditation verification frame, then, send registration request frame once more through behind one section random delay.
Preferably, because when the situation that the idler long-channel may exist a plurality of ONU to register simultaneously, so in the step 2, after OLT receives registration request frame, read current idler long-channel data in the wavelength management table, and it is loaded in the accreditation verification frame.
Preferably, because when the situation that the idler long-channel may exist a plurality of ONU to register simultaneously, so step 2, the accreditation verification frame of only receiving mates with the SN of oneself, just can send and confirm the feedback frame to OLT, after the unmatched ONU of SN receives the accreditation verification frame in the accreditation verification frame,, will use wavelength to switch to other idle wavelength according to current idler long-channel information.
By the present invention, do not need tunable laser is initially set to unified wavelength, increased the flexibility of system.
Embodiment two
Present embodiment provides a kind of ONU registration and Wavelength allocation method, and Fig. 2 is that ONU registers and the Wavelength Assignment flow chart according to the preferred embodiment of the invention, and as shown in Figure 2, this method comprises:
Step S202:ONU powers on, and waits for receiving downstream signal.OLT internal wavelength admin table comprises the occupied or idle information of wavelength channel, and each wavelength channel comprises a pair of corresponding uplink and downlink wavelength.OLT is loaded into the downstream signal frame with the wavelength channel state information, and is issued to each wavelength channel.
Step S204: judge whether the initial wavelength of tunable laser is occupied.If judged result is for being, execution in step S206, otherwise, execution in step S208.
Step S206:ONU switches to the idler long-channel with tunable laser.
It is mutual that step S208:ON U and OLT carry out log-on message, finishes registration and Wavelength Assignment process.
Step S210:ONU uses the wavelength channel and the OLT that are assigned with to carry out normal service communication.
Embodiment three
Present embodiment provides a kind of ONU to use the optical signal transmission method of the WDM-PON of tunable laser and wide range receiver, Fig. 3 is a WDM-PON system schematic of using tunable laser and wide range receiver according to the ONU of the embodiment of the invention, as shown in Figure 3, the WDM-PON system adopts Wave division multiplexer/demultiplexer spare (Mux/Dmux) that the downstream wavelength of different passages is assigned to corresponding branch optical fiber respectively from trunk optical fiber at distant-end node (RN node), and perhaps the uplink optical signal with different branch optical fiber incidents converges to the trunk optical fiber transmission.Thereby realize wavelength route to uplink and downlink signals.
Fig. 4 is that as shown in Figure 4, this method comprises according to the ONU of the embodiment of the invention and OLT log-on message reciprocal process schematic diagram one:
Step S402:OLT regularly sends the registed authorization frame to the idler long-channel.
Step S404: unregistered ONU receives the registed authorization frame of a certain idler long-channel correspondence that OLT sends, if tunable laser has been operated in this wavelength channel, then need not to adjust wavelength, otherwise ONU needs tunable laser is adjusted to corresponding wavelength channel.
After step S406:ONU receives the registed authorization frame, send registration request frame, report oneself SN number to OLT.
After step S408:OLT receives registration request frame, send the accreditation verification frame to ONU, notice ONU sends the time started of upward signal.
After step S410:ONU receives the accreditation verification frame, send affirmation feedback frame to OLT.
After step S412:OLT received and confirms the feedback frame, change wavelength management table status was finished this ONU registration and Wavelength Assignment process, and ONU begins regular traffic with OLT and communicates by letter.
Need to prove,, have only the downlink optical signal of single wavelength passage, so ONU only need use common wide range receiver to receive downlink optical signal because the multi-wavelength downstream signal that issues of OLT when arriving the ONU side, has passed through filtering.And because under this system architecture, unregistered ONU can not receive the regular traffic frame of having registered ONU, does not have a plurality of ONU yet and registers by a wavelength channel simultaneously, the ONU registration process is simple relatively,
Embodiment four
The WDM-PON that present embodiment provides a kind of ONU to use tunable laser and adjustable receiver carries out the method for Wavelength Assignment, present embodiment is based on the ODN network WDM-PON networking mode of Splitter form, Fig. 5 be use tunable laser and adjustable receiver according to the ONU of the embodiment of the invention the WDM-PON system schematic as shown in Figure 5 because this ODN network can't be assigned to each ONU by wavelength with the multi-wavelength downstream signal of OLT emission.Therefore, need adopt the wavelength-tunable receiver, promptly have the optical receiver of wavelength filtering function in the ONU side.The characteristics of this networking mode are that ONU can receive the downstream signal that is handed down to other ONU in the same WDM-PON network, but can not receive more than one downstream signal simultaneously.Because ONU is operated in some wavelength channels at random, what therefore receive may be the registed authorization frame, also may be the regular traffic frame that is handed down to other ONU.And has a situation that a plurality of ONU compete same idler long-channel.
Fig. 6 is that as shown in Figure 6, this method comprises according to the ONU of the embodiment of the invention and OLT log-on message reciprocal process schematic diagram two:
Step 1:ONU powers on, and is operated in a certain wavelength channel at random, waits for receiving downstream signal.OLT regularly sends the registed authorization frame to the idler long-channel, occupied wavelength channel is sent the regular traffic frame, comprise the wavelength channel state information in the regular traffic frame, if what ONU received is the registed authorization frame, the wavelength channel that the current place of ONU then is described is the idler long-channel, ONU need not regulate the operation wavelength of tunable laser and adjustable receiver, if what ONU received is the regular traffic frame, the wavelength channel that the current place of ONU then is described is occupied, and ONU will receive the wavelength adjusted in concert to corresponding wavelength channel with tunable laser emission wavelength and adjustable receiver.
It is mutual that step 2:ONU and OLT carry out log-on message at the idler long-channel, finishes registration and Wavelength Assignment process.Because when the situation that the idler long-channel may exist a plurality of ONU to register simultaneously, in step 2, the log-in protocol frame of sending out on the adjustable receiver must be a burst form.In addition, because when the situation that the idler long-channel may exist a plurality of ONU to register simultaneously, therefore in the step 2, after all ONU receive the registed authorization frame, all can send registration request frame to OLT, if a plurality of registration request frame arrive the time of OLT and clash, then claim frame is invalid, and ONU sends after the registration request frame through one period stand-by period, if do not receive the accreditation verification frame, then, send registration request frame once more through behind one section random delay.After OLT successfully receives registration request frame, read current idler long-channel data in the wavelength management table, and it is loaded in the accreditation verification frame does not finish registration ONU to all of this wavelength channel and send.The accreditation verification frame of only receiving mates with the SN of oneself, just can send and confirm the feedback frame to OLT, after the unmatched ONU of SN receives the accreditation verification frame in the accreditation verification frame,, will use wavelength to switch to other idler long-channels according to current idler long-channel information.
Embodiment five
The WDM-PON that present embodiment provides a kind of ONU to use tunable laser and coherent receiver carries out the method for Wavelength Assignment, adopt to use the WDM-PON system of coherent receiver in the present embodiment, this system can realize that channel spacing is the ultra dense collection WDM-PON system of several GHz.Utilize coherent detection technology not only can make number of users that qualitative leap is arranged, and can also improve receiving sensitivity significantly, thus the coverage rate of increase user of access network.Fig. 7 is a WDM-PON system schematic of using tunable laser and coherent receiver according to the ONU of the embodiment of the invention, as shown in Figure 7, form by three parts based on the WDM-PON ONU inside that the coherent reception technology realizes, tunable laser, external modulator and coherent receiver, the light that upward signal is sent by tunable laser loads the back through external modulator and produces.Coherent receiver receives the downstream signal of a plurality of wavelength, and the unmodulated local oscillator light signal that itself and tunable laser are produced carries out difference frequency, by spectrum filter corresponding certain downstream signal is leached again, and this process is exactly the coherent detection process.From the principle of coherent detection as can be seen, the prerequisite of coherent receiver received signal must have local oscillator light, and this is the characteristics that coherent receiver is different from common receiver.
ONU registration process based on the WDM-PON system of coherent receiver and tunable laser in the present embodiment is similar to embodiment four, and difference is in the step 1, and the tunable laser of ONU is only to coherent receiver emission light when initial, and ONU itself does not export light.This process can add optical switch and realize by the output at tunable laser, also can realize by external modulator.What ONU initially received may be the registed authorization frame, and at this moment ONU need not regulate the operation wavelength of tunable laser.Also may be the regular traffic frame, comprise the wavelength channel state information in the regular traffic frame.ONU is adjusted to idle wavelength channel according to wavelength channel information with the tunable laser emission wavelength, but still only to coherent receiver emission light.Second and the 3rd of registration goes on foot identical with embodiment four.
Present embodiment provides a kind of ONU, and Fig. 8 is the structured flowchart according to the ONU of the embodiment of the invention, as shown in Figure 8, this ONU comprises: receiver module 82, determination module 84, the first Registering modules 86, first transport module 88 is elaborated to said structure below:
Receiver module 82 is used to receive the downlink frame from OLT, and wherein, downlink frame is used in reference to the state information of oscillography long-channel; Determination module 84 is connected to receiver module 82, and the downlink frame that is used for receiving according to receiver module 82 is determined idle wavelength channel; First Registering modules 86 is connected to determination module 84, is used for carrying out the ONU registration with OLT on the wavelength channel of the free time that determination module 84 is determined; First transport module 88 is connected to first Registering modules 86, is used for the laggard industry transmission of being engaged in of succeeding in registration at the ONU of Registering modules 86.
Preferably, receiver module 82 is used for the downlink frame that receives from OLT by one of following:
When distant-end node used wavelength division multiplex device, ONU used the registed authorization frame of wide range optical receiver reception from OLT, and wherein, the registed authorization frame indicates the state of the wavelength channel at its place to be the free time:
When distant-end node uses common optical splitter, ONU uses registed authorization frame or the traffic frame of adjustable receiver reception from OLT, wherein, the registed authorization frame indicates the state of the wavelength channel at its place to be the free time, traffic frame carries the state information of wavelength channel, and the state of wavelength channel of indicating its place is for occupying; Or
When distant-end node uses common optical splitter, ONU sends local oscillator light by the tunable laser on it to coherent receiver, use registed authorization frame or the traffic frame of coherent receiver reception from OLT, wherein, the registed authorization frame indicates the state of the wavelength channel at its place to be the free time, traffic frame carries the state information of wavelength channel, and the state of wavelength channel of indicating its place is for occupying.
Preferably, determination module 84 is used for determining that the wavelength channel at registed authorization frame place is for idle wavelength channel or according to the definite idle wavelength channel of the state information of traffic frame medium wavelength passage.
Fig. 9 is the preferred construction block diagram according to the ONU of the embodiment of the invention, as shown in Figure 9, below said structure is elaborated:
First Registering modules 86 comprises:
Wavelength determination module 862, the current wavelength that is used for the ONU at definite its place is adjusted into idle wavelength channel for idle wavelength channel or with it;
Registration request frame sending module 864 is used for sending registration request frame on the wavelength channel of free time;
Confirm sending module 866, be used for behind the accreditation verification frame that receives the OLT transmission, send to OLT and confirm the feedback frame.
Above-mentioned ONU also comprises:
Judge module 92 is used for judging respectively whether self the sequence number of sequence number that the accreditation verification frame carries and its place ONU is identical;
First processing module 94 is connected to judge module 92, and the judged result that is used for judge module 92 sends to OLT and to confirm the feedback frame when being; Second processing module 96, connection judgment module 92, the judged result that is used for judge module 92 are carried out wavelength according to the current idle channel data of carrying in the accreditation verification frame and are switched for not the time.
Present embodiment provides a kind of OLT, and Figure 10 is the structured flowchart according to the ONU of the embodiment of the invention, and as shown in figure 10, this OLT comprises: sending module 102, processing module 104 and second transport module 106 are elaborated to said structure below:
Sending module 102 is used for sending downlink frame to optical network unit ONU, and wherein, downlink frame is used in reference to the state information of oscillography long-channel;
Second Registering modules 104 is used for carrying out the ONU registration with ONU on the wavelength channel of the free time that ONU determines;
Present embodiment provides a kind of EPON, Figure 11 is the structured flowchart according to the EPON of the embodiment of the invention, as shown in figure 11, this EPON comprises ONU 2 and OLT 4, wherein the concrete structure of ONU 2 is shown in Fig. 8 or 9, the structure of OLT 4 does not repeat them here as shown in figure 10.
Pass through the foregoing description, a kind of optical signal transmission method, device and EPON are provided, this method is by the downlink frame of ONU reception from the state information that is used in reference to the oscillography long-channel of OLT, determine idle wavelength channel according to downlink frame, and on the wavelength channel of free time, register, solved the problem of the lower and register flow path more complicated of the resource utilization of optical signal transmission method in the correlation technique, and then reached and improve the resource utilization of optical signal transmission and simplified register flow path.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. an optical signal transmission method is characterized in that, comprising:
Optical network unit ONU receives the downlink frame from optical line terminal OLT, and wherein, described downlink frame is used in reference to the state information of oscillography long-channel;
Described ONU determines idle wavelength channel according to described downlink frame;
Described ONU carries out ONU registration with described OLT on the wavelength channel of described free time, and in the described ONU laggard industry transmission of being engaged in of succeeding in registration.
2. method according to claim 1 is characterized in that, the downlink frame that described ONU receives from OLT comprises:
Described ONU receives downlink frame from described OLT and comprises one of following:
When distant-end node used wavelength division multiplex device, described ONU used the registed authorization frame of wide range optical receiver reception from described OLT, and wherein, described registed authorization frame indicates the state of the wavelength channel at its place to be the free time:
When described distant-end node uses common optical splitter, described ONU uses registed authorization frame or the traffic frame of adjustable receiver reception from described OLT, wherein, described registed authorization frame indicates the state of the wavelength channel at its place to be the free time, described traffic frame carries the state information of described wavelength channel, and the state of wavelength channel of indicating its place is for occupying;
When described distant-end node uses described common optical splitter, described ONU sends local oscillator light by the tunable laser on it to coherent receiver, use registed authorization frame or the traffic frame of described coherent receiver reception from described OLT, wherein, described registed authorization frame indicates the state of the wavelength channel at its place to be the free time, described traffic frame carries the state information of wavelength channel, and the state of wavelength channel of indicating its place is for occupying.
3. method according to claim 2 is characterized in that,
Described ONU determines that according to described downlink frame idle wavelength channel comprises:
Described OLT determines that the wavelength channel at described registed authorization frame place is for idle wavelength channel or according to the definite idle wavelength channel of the state information of wavelength channel described in the described traffic frame.
4. method according to claim 1 is characterized in that, described ONU carries out ONU registration with described OLT on the wavelength channel of described free time, and comprises in the described ONU laggard industry transmission of being engaged in of succeeding in registration:
Described ONU determines that its current wavelength is the wavelength channel of described free time or according to the state information of the described wavelength channel that carries in the described traffic frame it is adjusted into the wavelength channel of described free time;
Described ONU sends registration request frame behind the registed authorization frame that receives described OLT transmission on the wavelength channel of described free time;
Described ONU sends affirmation feedback frame to described OLT behind the accreditation verification frame that receives described OLT transmission, the industry of going forward side by side is engaged in transmitting.
5. method according to claim 1 is characterized in that,
Before the downlink frame of described ONU reception, also comprise from optical line terminal OLT:
Described OLT determines the state of all wavelengths passage, and generates the state that the wavelength management souvenir carries described all wavelengths passage, and regularly sends the registed authorization frame to all idle wavelength channels, and wherein said state comprises: take or the free time;
On the wavelength channel of described ONU, carry out the ONU registration, and after described ONU succeeds in registration laggard traveling optical signal transmission, also comprise with described OLT in the described free time:
Described OLT with the status modifier of wavelength channel in described wavelength management table of described free time for occupying.
6. according to each described method of claim 1 to 5, it is characterized in that,
Described registration request frame uses burst form to send;
Described idle wavelength is carried out time period that described registration request frame that described ONU registration and described a plurality of ONU send arrives described OLT simultaneously by a plurality of ONU to be had when overlapping, sends described registration request frame once more after described a plurality of ONU wait for random times.
7. according to each described method in the claim 1 to 5, it is characterized in that, also comprise:
Described OLT carries the data of the channel status of the current idler long-channel in the wavelength management table in the accreditation verification frame.
8. method according to claim 7 is characterized in that, also comprises:
Described ONU judges respectively whether the sequence number and the sequence number of himself that carry in the described accreditation verification frame be identical;
If judged result is for being, then send and confirm the feedback frame to described OLT, otherwise, carry out wavelength according to the data of the channel status of the described current idle channel that carries in the described accreditation verification frame and switch.
9. an optical network unit ONU is characterized in that, comprising:
Receiver module is used to receive the downlink frame from optical line terminal OLT, and wherein, described downlink frame is used in reference to the state information of oscillography long-channel;
Determination module is used for determining idle wavelength channel according to described downlink frame;
First Registering modules is used for carrying out the ONU registration with described OLT on the wavelength channel of described free time;
First transport module is used for the laggard industry transmission of being engaged in of succeeding in registration at described ONU.
10. ONU according to claim 9 is characterized in that,
Described receiver module is used for the downlink frame that receives from described OLT by one of following:
When distant-end node used wavelength division multiplex device, described ONU used the registed authorization frame of wide range optical receiver reception from described OLT, and wherein, described registed authorization frame indicates the state of the wavelength channel at its place to be the free time:
When described distant-end node uses common optical splitter, described ONU uses registed authorization frame or the traffic frame of adjustable receiver reception from described OLT, wherein, described registed authorization frame indicates the state of the wavelength channel at its place to be the free time, described traffic frame carries the state information of described wavelength channel, and the state of wavelength channel of indicating its place is for occupying; Or
When described distant-end node uses described common optical splitter, described ONU sends local oscillator light by the tunable laser on it to coherent receiver, use described registed authorization frame or the described traffic frame of coherent receiver reception from described OLT, wherein, described registed authorization frame indicates the state of the wavelength channel at its place to be the free time, described traffic frame carries the state information of wavelength channel, and the state of wavelength channel of indicating its place is for occupying.
11. ONU according to claim 10 is characterized in that,
Described determination module is used for determining that the wavelength channel at described registed authorization frame place is for idle wavelength channel or according to the definite idle wavelength channel of the state information of wavelength channel described in the described traffic frame.
12. ONU according to claim 9 is characterized in that,
Described Registering modules comprises:
Wavelength determination module, the current wavelength that is used for determining the ONU at its place are that the state information of the wavelength channel of described free time or the described wavelength channel that carries according to described traffic frame is adjusted into the wavelength channel of described free time with it;
The registration request frame sending module is used for sending registration request frame behind the registed authorization frame that receives described OLT transmission on the wavelength channel of described free time;
Confirm sending module, be used for behind the accreditation verification frame that receives described OLT transmission, send to described OLT and confirm the feedback frame.
13. an optical line terminal OLT is characterized in that, comprising:
Sending module is used for sending downlink frame to optical network unit ONU, and wherein, described downlink frame is used in reference to the state information of oscillography long-channel;
Second Registering modules is used for carrying out the ONU registration with described ONU on the wavelength channel of the free time that described ONU determines;
Second transport module is used for the laggard industry transmission of being engaged in of succeeding in registration at described ONU.
14. an EPON is characterized in that, comprising:
According to each described optical network unit ONU in the claim 9 to 12 and optical line terminal OLT according to claim 13.
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| PCT/CN2012/070342 WO2012095024A1 (en) | 2011-01-13 | 2012-01-13 | Method and device for transmitting optical signal, and passive optical network |
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| WO2012095024A1 (en) | 2012-07-19 |
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