WO2017002322A1 - 通信装置、通信方法、及び、通信システム - Google Patents
通信装置、通信方法、及び、通信システム Download PDFInfo
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- WO2017002322A1 WO2017002322A1 PCT/JP2016/002960 JP2016002960W WO2017002322A1 WO 2017002322 A1 WO2017002322 A1 WO 2017002322A1 JP 2016002960 W JP2016002960 W JP 2016002960W WO 2017002322 A1 WO2017002322 A1 WO 2017002322A1
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- signal
- wavelength
- optical
- multiplexed
- communication
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
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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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0084—Quality of service aspects
Definitions
- the present invention relates to a technique for measuring an optical signal-to-noise ratio in an optical communication network capable of transmitting and receiving wavelength multiplexed signals.
- wavelength division multiplexing system an optical signal transmitted / received according to such a method
- wavelength multiplexed signal an optical signal transmitted / received according to such a method
- OSNR Optical Signal to Noise Ratio
- Patent Document 1 discloses a technique for verifying the transmission quality of a new route set in an optical transmission network.
- the technique disclosed in Patent Document 1 extracts a transmission parameter indicating the transmission characteristic of the new route based on the result of transmitting and receiving a test signal using the new route, and verifies the transmission quality based on the transmission parameter. To do.
- Patent Document 2 discloses a technique for measuring the OSNR of a channel to be measured by lowering the bit rate of the optical signal of the channel to be measured, which is an OSNR measurement target, in an optical transmission network. Such a technique narrows the spectral width of the optical signal by lowering the bit rate of the optical signal of the channel under measurement, and measures the noise component of the channel under measurement in a state where the influence of the adjacent channel is reduced.
- Patent Document 3 discloses a technique for measuring (estimating) OSNR without using a power monitor that measures the signal strength of each channel in an optical repeater constituting an optical transmission network.
- the technique disclosed in Patent Document 3 calculates the gain tilt of each channel in the optical repeater from the total optical power in the optical repeater, and obtains the OSNR of each channel in the optical repeater using the gain tilt.
- the technique disclosed in Patent Document 3 is a technique for estimating the OSNR on the assumption that the gain tilt of each optical repeater is equal, and is not a technique that can directly solve the above problem. Moreover, since the technique disclosed in Patent Document 3 does not sufficiently consider the characteristics of individual repeaters (for example, individual differences for each production lot, aging deterioration, etc.), the technique alone is in operation. It is difficult to accurately calculate the OSNR of the optical transmission line. That is, when these related technologies are used, when measuring OSNR in an optical communication system in operation, there are cases where effects such as communication interruption and reduction in communication speed (communication band) may occur.
- an object of the present invention is to provide a communication device and the like capable of measuring an optical signal-to-noise ratio while reducing an influence on a communication environment in an optical communication system capable of transmitting and receiving wavelength division multiplexed signals. I will.
- a communication apparatus receives one or more optical signals and generates an optical multiplexing unit that generates an optical signal obtained by combining the optical signals, and the optical multiplexing
- a first converted signal generating means for generating a converted signal which is an optical signal obtained by selecting a signal of the first wavelength from the wavelength multiplexed signal generated in the means and converting it to a signal of the second wavelength;
- the first wavelength multiplex signal and the converted signal are received, and at least one of the signal included in the wavelength multiplex signal and the converted signal is selected and output for each wavelength of the signal included therein.
- Signal selection means receives one or more optical signals and generates an optical multiplexing unit that generates an optical signal obtained by combining the optical signals, and the optical multiplexing
- a communication apparatus receives a wavelength multiplexed signal obtained by combining one or more optical signals from an optical communication path, and a signal related to a third wavelength signal among the wavelength multiplexed signals.
- a measurement means capable of measuring at least one of a level and a noise level; and a first signal for generating a restoration signal which is an optical signal obtained by selecting a signal of the fourth wavelength from the wavelength multiplexed signal and converting the signal to the third wavelength.
- the communication method receives one or more optical signals, generates a wavelength multiplexed signal that is an optical signal obtained by combining the signals, and generates a first wavelength from the generated wavelength multiplexed signal.
- a converted signal that is an optical signal converted to a signal of the second wavelength is selected, and the wavelength multiplexed signal is generated for each wavelength of the generated wavelength multiplexed signal and the converted signal. At least one of the signal included in the signal and the converted signal is output.
- a communication method receives a wavelength multiplexed signal obtained by combining one or more optical signals from an optical communication path, and a signal related to a third wavelength signal among the wavelength multiplexed signals. Measuring at least one of a level and a noise level, selecting a signal of a fourth wavelength from the wavelength-multiplexed signal, generating a restoration signal that is an optical signal converted to the third wavelength, and generating the wavelength-multiplexed signal And at least one of the optical signal included in the wavelength multiplexed signal and the restoration signal for each wavelength of the optical signal included in the converted signal, and the selected optical signal is converted into the optical signal. Demultiplexing based on the wavelength of the included signal.
- this object can be achieved by a communication device having the above configuration or a communication system realized using a communication method.
- an optical signal-to-noise ratio can be measured while reducing the influence on the communication environment in an optical communication system capable of transmitting and receiving wavelength multiplexed signals.
- FIG. 1 is a block diagram illustrating a functional configuration of components constituting a communication system in the first embodiment of the present invention.
- FIG. 2 is an explanatory diagram schematically showing a wavelength multiplexed signal transmitted / received via an optical communication line (transmission path) in the first embodiment of the present invention.
- FIG. 3 is an explanatory diagram schematically showing a noise level when a signal having a wavelength that is an OSNR measurement target is cut off (quenched) in relation to each embodiment of the present invention.
- FIG. 4 is an explanatory diagram schematically showing a wavelength multiplexed signal when a signal having a wavelength to be measured for OSNR is converted into a signal having a detour wavelength in relation to the first embodiment of the present invention. .
- FIG. 1 is a block diagram illustrating a functional configuration of components constituting a communication system in the first embodiment of the present invention.
- FIG. 2 is an explanatory diagram schematically showing a wavelength multiplexed signal transmitted / received via an optical communication line (
- FIG. 5 is an explanatory diagram schematically showing a wavelength multiplexed signal when a signal having a bypass wavelength is converted into a signal having a wavelength to be measured by OSNR, in relation to the first embodiment of the present invention.
- FIG. 6 is an explanatory diagram schematically showing a wavelength multiplexed signal when a signal of a specific wavelength is not mounted in relation to the second embodiment of the present invention.
- FIG. 7 is a block diagram illustrating the functional configuration of the components constituting the communication system in the second embodiment of the present invention.
- FIG. 8 is an explanatory diagram schematically showing a wavelength multiplexed signal when a signal is inserted into the wavelength to be measured for OSNR in the second embodiment of the present invention.
- FIG. 8 is an explanatory diagram schematically showing a wavelength multiplexed signal when a signal of another wavelength is temporarily inserted as a signal of a wavelength to be measured for OSNR in a modification of the second embodiment of the present invention.
- FIG. 10 is a block diagram illustrating a functional configuration of a communication apparatus according to the third embodiment of the invention.
- FIG. 11 is a block diagram illustrating a functional configuration of a communication apparatus according to the fourth embodiment of the present invention.
- FIG. 12 is a block diagram illustrating a functional configuration of a communication device according to a modification of the fourth embodiment of the present invention.
- FIG. 13 is a block diagram illustrating a functional configuration of a communication apparatus according to the fifth embodiment of the invention.
- FIG. 14 is an explanatory diagram illustrating a hardware configuration capable of realizing the control terminal or the control unit in each embodiment of the present invention.
- measuring OSNR is important from the viewpoint of maintaining communication quality in a transmission line or early detection of problems that may occur in the transmission line.
- the technology described using the following embodiments in relation to the present invention provides another modulation signal (bypass signal) that can be transferred by bypassing the traffic data superimposed on the modulation signal to be measured by OSNR.
- bypass signal another modulation signal
- the technology relating to the present invention which will be described using the following embodiments, it is possible to efficiently measure the OSNR of all wavelength bands while reducing the traffic disconnection (disconnection) time in the optical communication system.
- the structure described in each following embodiment is an illustration, and the technical scope of this invention is not limited to them.
- FIG. 1 is a block diagram illustrating a functional configuration of a communication system (a transmission-side communication system 101 and a reception-side communication system 102) that constitutes a communication system according to the first embodiment of the present invention.
- the optical transceiver 103a and the optical transceiver 103b may have the same configuration or function.
- the optical transceiver 103a and the optical transceiver 103b may be collectively referred to simply as “optical transceiver 103”.
- the bypass optical transceiver 104a and the bypass optical transceiver 104b may have the same configuration or function.
- the detouring optical transceiver 104a and the detouring optical transceiver 104b may be collectively referred to simply as “the detouring optical transceiver 104”.
- the optical coupler 107a and the optical coupler 107b may have the same configuration or function.
- optical coupler 107a and the optical coupler 107b may be collectively referred to simply as “optical coupler 107”.
- wavelength selective switch 108a and the wavelength selective switch 108b may have the same configuration or function.
- the wavelength selective switch 108a and the wavelength selective switch 108b may be collectively referred to simply as “wavelength selective switch 108”.
- optical multiplexing / demultiplexing devices 105 and 111 in FIG. 1 may function as a transmitting device or a receiving device by having the same configuration.
- FIG. 1 for convenience of explanation, a configuration of an optical multiplexing / demultiplexing device 105 that functions as a transmission device is illustrated.
- FIG. 1 shows the configuration of an optical multiplexer / demultiplexer 111 that functions as a receiver.
- One or more optical transceivers 103 a are connected to the transmission-side communication system 101.
- Each optical transceiver 103a connected to the transmission-side communication system 101 is communicably connected to an optical multiplexing / demultiplexing device 105 described later.
- the transmission-side communication system 101 and the optical multiplexer / demultiplexer 105 may be communicably connected by an optical circuit device such as an optical fiber, for example.
- the optical transceiver 103a receives, for example, traffic data (for example, communication data from the tributary side), and generates an optical signal that can be transmitted on the optical transmission path on which the traffic data is superimposed.
- the optical transceiver 103a outputs the generated optical signal to the optical multiplexer / demultiplexer 105 (described later).
- Each optical transceiver 103a may accept, for example, traffic data carried by an electrical signal or traffic data carried by an optical signal.
- the optical transceiver 103a can function as an interface between two networks (for example, a communication network laid on land and a communication network embedded in the sea).
- each optical transceiver 103a converts the traffic data received from one communication network (for example, a land communication network) into a format that can be transmitted and received in the other communication network (for example, an underwater communication network) (for example, Frame).
- the optical transceiver 103a can appropriately change the wavelength of the generated optical signal based on, for example, a setting or a control signal.
- each optical transceiver 103a connected to the transmission-side communication system 101 can generate optical signals having different wavelengths.
- the optical transceiver 103a when receiving an optical signal from the optical multiplexer / demultiplexer 105, the optical transceiver 103a (optical transceiver 103b) converts the data into an appropriate format and outputs the data to the tributary side. May be.
- the optical transceiver 103a may accept an optical signal having a specific wavelength selected based on a setting or control signal from the optical multiplexer / demultiplexer 105.
- the optical multiplexer / demultiplexer 105 includes an optical multiplexer 106, an optical coupler 107a, and a wavelength selective switch 108a. These components constituting the optical multiplexer / demultiplexer 105 are connected using an optical circuit device such as an optical fiber.
- the optical multiplexer 106 receives one or more optical signals and outputs an optical signal obtained by combining the optical signals. Specifically, for example, the optical multiplexer 106 receives optical signals of different wavelengths from each of the one or more optical transceivers 103a, and generates a wavelength-multiplexed main signal (wavelength multiplexed signal). The optical multiplexer 106 outputs the generated wavelength multiplexed signal to an optical coupler 107a (optical coupler A) described later.
- the optical multiplexer 106 can be realized by using, for example, a prism, a diffraction grating, a thin film filter, or an AWG (arrayed waveguide grating) using a micro-optics technique.
- the optical coupler 107a branches an input optical signal (wavelength multiplexed signal) into two or more transmission paths and outputs the result. Specifically, the optical coupler 107a branches and outputs the wavelength multiplexed signal received from the optical multiplexer 106 to a wavelength selective switch 108a and a bypass optical transceiver 104a described later.
- the optical coupler 107a may be, for example, a melt-stretching coupler obtained by processing an optical fiber, or a waveguide coupler in which an optical waveguide is formed on a circuit board. Further, the optical coupler 107a may be realized using, for example, a minute half mirror.
- the detouring optical transceiver 104 a is connected to the optical multiplexing / demultiplexing device 105, converts the wavelength of a specific signal among the wavelength multiplexed signals received by the optical multiplexing / demultiplexing device 105, and returns to the optical multiplexing / demultiplexing device 105 for output.
- the bypass optical transceiver 104a receives a signal having a specific wavelength among the wavelength multiplexed signals based on a setting or control signal or the like. Further, the bypass optical transceiver 104 a outputs an optical signal having a wavelength selected based on a setting or control signal to the optical multiplexer / demultiplexer 105. Further, the bypass optical transceiver 104a can convert the optical signal received from the optical multiplexer / demultiplexer 105 and output it to the tributary side.
- the wavelength multiplexed signal branched by the optical coupler 107a of the optical multiplexing / demultiplexing device 105 is input to the reception port Rx on the line side of the bypass optical transceiver 104a (port connected to the optical multiplexing / demultiplexing device 105).
- the bypass optical transceiver 104a includes a light emitting unit capable of emitting local light, and can receive a specific optical signal having the same wavelength as the local light.
- the wavelength of the local light is variable, and the bypass optical transceiver 104a can receive an optical signal having an arbitrary wavelength.
- the bypass optical transceiver 104a responds to a control signal from the control terminal 114, which will be described later, among the wavelength multiplexed signals, a wavelength that is an OSNR measurement target (hereinafter may be referred to as “measurement target wavelength”).
- a wavelength that is an OSNR measurement target (hereinafter may be referred to as “measurement target wavelength”).
- the detour optical transceiver 104a includes the measurement target wavelength ( ⁇ k and Receive) signal.
- the measurement target wavelength ⁇ k may be any wavelength among n wavelengths from ⁇ 1 to ⁇ n.
- the said light emission part is good also as the same as the light emission part of the local light with which a known coherent receiver is provided, for example.
- the transmission port Tx and the reception port Rx on the tributary side of the bypass optical transceiver 104a are connected in a loopback manner. Specifically, the bypass optical transceiver 104a outputs an output signal generated based on the received optical signal of the measurement target wavelength to the transmission port Tx on the tributary side. At this time, the bypass optical transceiver 104a may convert the optical signal of the wavelength to be measured into an appropriate format as necessary.
- the output signal output to the transmission port Tx on the tributary side is directly input to the bypass optical transceiver 104a.
- the bypass optical transceiver 104a outputs the signal input to the tributary reception port Rx to the wavelength selective switch 108a.
- the bypass optical transceiver 104a may convert the signal input to the reception port Rx on the tributary side into an appropriate format and output the converted signal to the wavelength selective switch 108a.
- the bypass optical transceiver 104a selects the wavelength of the optical signal to be output (hereinafter may be referred to as “detour wavelength”) based on the control signal from the setting or control terminal 114. Then, the bypass optical transceiver 104 a outputs the optical signal to the optical multiplexer / demultiplexer 105.
- the bypass optical transceiver 104 a can convert the wavelength of the signal received from the optical multiplexer / demultiplexer 105 and output the converted signal to the optical multiplexer / demultiplexer 105. That is, the bypass optical transceiver 104a receives the signal of the measurement target wavelength ⁇ k from the optical multiplexer / demultiplexer 105, converts the wavelength of the optical signal to the bypass wavelength ( ⁇ d), and Can be output.
- the optical signal of the detouring wavelength ⁇ d output from the detouring optical transceiver 104a to the optical multiplexer / demultiplexer 105 may be referred to as a detouring signal.
- the detour wavelength ⁇ d is a wavelength that is not included in the wavelength band of the main signal.
- the bypass wavelength ⁇ d may be, for example, a transmission line monitoring band to which a band different from the main signal band is allocated. In general, such a monitoring band can be used as a detour wavelength because the frequency of use is low.
- the detouring wavelength ⁇ d is not limited to the transmission line monitoring band, and may be included in any other wavelength band different from the main signal band.
- the bypass optical transceiver 104a and the optical transceiver 103a can set the wavelength of the optical signal to be received and the wavelength of the optical signal to be output based on the setting or control signal. It may be realized as an apparatus having the configuration described above. In this case, for example, by turning back the transmission port Tx on the tributary side of a certain optical transceiver 103a and connecting it to the receiving port Rx, it can be used as the bypass optical transceiver 104a.
- the wavelength selective switch 108a can accept one or more optical signals and select a signal to be output (transmitted) among the received signals for each wavelength.
- the wavelength selective switch 108a includes two optical signals, ie, a wavelength multiplexed signal output from the optical coupler 107a and a bypass signal output from the bypass optical transceiver 104a. Signals are received from two input ports.
- the wavelength selective switch 108a can select which of the two optical signals is transmitted for each wavelength of the optical signal based on, for example, a control signal or setting from the control terminal 114. Specifically, the wavelength selective switch 108a can transmit, for example, signals other than the measurement target wavelength ⁇ k among the wavelength multiplexed signals input from the optical coupler 107a. Further, the wavelength selective switch 108a can transmit, for example, a bypass signal (a bypass wavelength ⁇ d) output from the bypass optical transceiver 104a. That is, the wavelength selective switch 108a can block the signal of the wavelength ⁇ k to be measured among the input wavelength multiplexed signals and transmit the signal of the detour wavelength ⁇ d. As the wavelength selective switch 108a, for example, WSS (Wavelength Selective Switch) using an LCOS (Liquid Crystal On Silicon) device is known.
- WSS Widelength Selective Switch
- LCOS Liquid Crystal On Silicon
- FIG. 4 is an explanatory diagram schematically showing a wavelength multiplexed signal transmitted from the wavelength selective switch 108a to a transmission path (described later).
- the traffic data superimposed on the optical signal of the OSNR measurement target wavelength ⁇ k by the transmission-side communication system 101 configured as described above uses the optical signal of the detour wavelength ⁇ d. Is transmitted.
- the measurement target wavelength ⁇ k becomes a no-signal state.
- the receiving-side optical multiplexer / demultiplexer 111 described later can measure the noise level in the transmission path of the measurement target wavelength ⁇ k.
- the transmission line includes a plurality of transmission line fibers (optical transmission fibers) 109 and an optical amplifier 110.
- transmission line fibers optical transmission fibers
- optical amplifier 110 For example, assuming a submarine cable system, these transmission line components are submerged in the seabed. Therefore, it is difficult to know changes in characteristics of these components, including aging deterioration in actual operating conditions.
- the optical transmission fiber 109 and the optical amplifier 110 can be realized using well-known techniques, and thus detailed description thereof is omitted.
- the optical transceiver 103b may have the same configuration and function as the optical transceiver 103a.
- the optical transceiver 103b receives (receives) an optical signal from the optical multiplexer / demultiplexer 111 (described later). More specifically, the optical transceiver 103b receives an optical signal having a specific wavelength demultiplexed by the optical demultiplexer 112 in the optical multiplexer / demultiplexer 111.
- the optical transceiver 103b outputs the received optical signal as traffic data to the tributary side.
- the optical multiplexing / demultiplexing device 111 and the bypass optical transceiver 104b in the receiving-side communication system 102 will be described.
- the optical multiplexer / demultiplexer 111 includes an optical coupler 107b (optical coupler B, optical coupler C), a wavelength selective switch 108b, an optical demultiplexer 112, and a wavelength selective optical intensity detector. 113.
- the wavelength multiplexed signal received via the transmission path is branched by the first-stage (first stage) optical coupler 107b (optical coupler B) on the transmission path side.
- One of the branched optical signals is sent to a wavelength selective light intensity detector 113 (described later).
- the other signal is sent to the optical coupler 107b (optical coupler C) at the subsequent stage (second stage).
- the second-stage optical coupler 107b (optical coupler C) branches the wavelength multiplexed signal received from the optical coupler B toward the bypass optical transceiver 104b and the wavelength selective switch 108b.
- Such an optical coupler 107b can be realized by using a technique similar to that of the optical coupler 107a.
- the wavelength selective light intensity detector 113 has a function of detecting (detecting) the intensity (light intensity) of light of a specific wavelength.
- the wavelength selective light intensity detector 113 detects a signal level when a signal (a modulation signal carrying traffic data) exists at a wavelength to be detected.
- the wavelength selective light intensity detector 113 detects the noise level when no signal is present at the wavelength to be detected.
- a wavelength for detecting the light intensity is set in the wavelength selective light intensity detector 113 based on, for example, a control signal from the control terminal 114.
- the wavelength selective light intensity detector 113 may be configured using, for example, an optical variable filter and a light receiving element.
- a specific wavelength is selected in the optical variable filter (that is, only the specific wavelength is transmitted), and the light intensity of the specific wavelength is obtained using a light receiving element (for example, a photo detector (PD: Photo Detector) or the like). Detected.
- PD Photo detector
- the detour optical transmitter / receiver 104b receives a signal having a specific wavelength (the same wavelength as the local light) in the wavelength multiplexed signal by using local light in the same manner as the detour optical transmitter / receiver 104a. More specifically, the bypass optical transceiver 104b receives an optical signal having a bypass wavelength ⁇ d (a bypass signal) among the wavelength multiplexed signals received from the optical coupler C.
- the transmission port Tx and the reception port Rx on the tributary side of the bypass optical transceiver 104b are connected back to back.
- the detour optical transceiver 104b outputs an output signal generated based on the received optical signal to the tributary transmission port Tx, similarly to the detour optical transceiver 104a.
- the output signal is directly input to the reception port Rx on the tributary side of the bypass optical transceiver 104b.
- the bypass optical transceiver 104b generates an optical signal based on the signal input to the reception port Rx on the tributary side.
- the wavelength of the optical signal output from the bypass optical transceiver 104b is selected.
- ⁇ k is set as the wavelength.
- the bypass optical transceiver 104b receives the signal of the bypass wavelength ⁇ d from the optical multiplexer / demultiplexer 111, converts the wavelength of the optical signal to the measurement target wavelength ⁇ k, and outputs the wavelength to the optical multiplexer / demultiplexer 105 can do. That is, as a result, the detour signal transmitted using the detour wavelength ⁇ d is returned (restored) to the original signal of the measurement target wavelength ⁇ k.
- the wavelength selective switch 108b accepts one or more optical signals like the wavelength selective switch 108a described above.
- the wavelength selective switch 108b can select a signal to be transmitted among the received signals for each wavelength.
- the wavelength selective switch 108b in the present embodiment outputs the wavelength multiplexed signal output from the optical coupler 107b (optical coupler C) and the detour optical transceiver 104b.
- two optical signals (signals having a wavelength to be measured ⁇ k) are received from the two input ports.
- the wavelength selective switch 108b can select which of the two optical signals is transmitted for each wavelength of the optical signal based on a control signal or setting from the control terminal 114, for example.
- the wavelength selective switch 108b transmits, for example, signals other than the detour wavelength ⁇ d among the wavelength multiplexed signals input from the optical coupler C.
- the wavelength selective switch 108a transmits, for example, an optical signal (a signal having a measurement target wavelength ⁇ k) output from the detouring optical transceiver 104b.
- the wavelength selective switch 108b blocks the signal of the detour wavelength ⁇ d from the input wavelength multiplexed signal and transmits the signal of the measurement target wavelength ⁇ k.
- the wavelength multiplexed signal output from the wavelength selective switch 108b is the same signal as the wavelength multiplexed signal output from the optical multiplexer 106 to the optical coupler A.
- the optical demultiplexer 112 receives the wavelength multiplexed signal output from the wavelength selective switch 108b as an input.
- the optical demultiplexer 112 separates the received wavelength multiplexed signal for each wavelength, and outputs the separated signal to each optical transceiver 103b.
- the wavelength multiplexed signal includes signals of n wavelengths from ⁇ 1 to ⁇ n
- the optical demultiplexer 112 separates the wavelength multiplexed signal into n individual signals, and each of the signals is an optical transceiver. You may output to 103b.
- Such an optical demultiplexer 112 may be realized using, for example, an interference film filter using a dielectric multilayer film, a diffraction grating, or the like.
- FIG. 5 is an explanatory diagram schematically showing a wavelength multiplexed signal output from the wavelength selective switch 108b.
- the traffic data transmitted using the optical signal with the detour wavelength ⁇ d is converted (restored) into the optical signal with the original wavelength (measurement target wavelength ⁇ k).
- the wavelength multiplexed signal output from the wavelength selective switch 108b is restored to the same signal as the wavelength multiplexed signal output from the optical multiplexer 106.
- the wavelength division multiplexed signal is demultiplexed for each wavelength by the optical demultiplexer 112 and output to each optical transceiver 103b. Since the signal converted to the detour wavelength ⁇ d for OSNR measurement is converted back to the original wavelength (measurement target wavelength ⁇ k), each optical transceiver (103a, 103b) considers the wavelength conversion. Communication can be performed without any problem.
- the control terminal 114 is connected to the bypass optical transceiver 104a and the wavelength selective switch 108a in the transmission-side communication system 101 by a control line.
- the control terminal 114 is connected to the bypass optical transceiver 104b, the wavelength selective switch 108b, and the wavelength selective light intensity detector 113 in the receiving communication system 102 by a control line.
- the control line is a control communication line.
- Such a control line may be realized using a part of the transmission path of the optical signal, or may be realized using a communication line different from the transmission path. More specifically, the control line can be realized by using an order wire line set for an arbitrary channel in the transmission path.
- the control signal transmitted by the control terminal 114 may be included in an overhead area added to a frame for carrying traffic data (user data) on the transmission path, for example.
- the control terminal 114 can control the bypass optical transceivers (104a, 104b), the wavelength selective switches (108a, 108b), and the wavelength selective light intensity detector 113 via such control lines.
- the control terminal 114 may transmit a control signal to each component described above, or may transmit setting information used for setting each component.
- control terminal 114 sets the wavelength of local light for the bypass optical transceiver 104a.
- the wavelength of the local light is set to the measurement target wavelength ⁇ k, for example.
- the control terminal 114 sets the wavelength of the optical signal output from the bypass optical transceiver 104a.
- the wavelength of the optical signal output from the bypass optical transceiver 104a is set to, for example, the bypass wavelength ⁇ d.
- control terminal 114 sets the wavelength of the local light for the bypass optical transceiver 104b.
- the wavelength of the local light is set to the detour wavelength ⁇ d, for example.
- control terminal 114 may set the wavelength of the optical signal output from the detouring optical transceiver 104b.
- the wavelength of the optical signal output from the bypass optical transceiver 104b is set to the measurement target wavelength ⁇ k, for example.
- the control terminal 114 sets the wavelength of the signal transmitted through the wavelength selective switch 108a.
- the wavelength selective switch 108a is set to transmit a signal having a wavelength other than the measurement target wavelength ⁇ k among the wavelength multiplexed signals received from the optical coupler 107a (optical coupler A).
- the wavelength selective switch 108a is set to transmit, for example, a signal having a detour wavelength ⁇ d received from the detour optical transceiver 104a.
- the control terminal 114 sets the wavelength selected by the wavelength selective switch 108b.
- the wavelength selective switch 108b is set to transmit a signal having a wavelength other than the detour wavelength ⁇ d among the wavelength multiplexed signals received from the optical coupler 107b (optical coupler C).
- the wavelength selective switch 108b is set so as to transmit the signal of the measurement target wavelength ⁇ k received from the bypass optical transceiver 104b.
- the control terminal 114 sets the wavelength of the optical signal detected by the wavelength selective light intensity detector 113.
- the wavelength of the optical signal is set to, for example, a wavelength that is an OSNR measurement target (measurement target wavelength ⁇ k).
- control terminal 114 sets the reception wavelength of the bypass optical transceiver 104a in the transmission-side communication system 101 to the measurement target wavelength (for example, ⁇ k) by transmitting a control signal. Further, the control terminal 114 sets the transmission wavelength of the bypass optical transceiver 104a to the bypass wavelength ( ⁇ d).
- control terminal 114 sets the reception wavelength of the bypass optical transceiver 104b in the receiving communication system 102 to the bypass wavelength ( ⁇ d) by transmitting a control signal. Further, the control terminal 114 sets the transmission wavelength of the bypass optical transceiver 104b to the OSNR measurement target wavelength ( ⁇ k).
- the bypass optical transceiver 104a on the transmission side is an OSNR measurement target that matches the set reception wavelength ( ⁇ k) among the wavelength multiplexed signals output from the optical coupler 107a (optical coupler A). Receive only the signal. Then, the detour optical transceiver 104a converts the signal into a detour wavelength ( ⁇ d), and outputs the detour signal to the wavelength selective switch 108a.
- the detouring optical transceiver 104b on the receiving side receives only the signal set to the detouring wavelength ( ⁇ d) among the wavelength multiplexed signals from the optical coupler 107b (optical coupler C). Then, the bypass optical transceiver 104b returns (restores) the signal to the wavelength ( ⁇ k) of the OSNR measurement target.
- the control terminal 114 sets the wavelength of the signal transmitted by the transmission-side wavelength selective switch 108a by transmitting a control signal.
- the wavelength selective switch 108a on the transmission side blocks only the signal of the wavelength ( ⁇ k) to be measured for OSNR among the wavelength multiplexed signals received from the optical coupler 107a (optical coupler A).
- the wavelength selective switch 108a transmits a detour signal (a signal having a detour wavelength ⁇ d) received from the detour optical transceiver 104a.
- the wavelength selective switch 108a can transmit the wavelength multiplexed signal to the transmission line in the state where no signal exists at the wavelength for measuring the OSNR (FIG. 4).
- the control terminal 114 sets the wavelength of the signal transmitted by the wavelength selective switch 108b. Therefore, the wavelength selective switch 108b on the receiving side cuts off the signal of the detour wavelength ( ⁇ d) from the wavelength multiplexed signal received from the optical coupler 107b (optical coupler C) and transmits the other signals. . Further, according to the setting, the wavelength selective switch 108b transmits the signal (the signal having the measurement target wavelength ⁇ k) output from the bypass optical transceiver 104b. The wavelength selective switch 108b combines these transmitted signals and sends them to the subsequent optical demultiplexer 112 (FIG. 5). Thereby, each optical transceiver 103b can receive the original (original) signal.
- the control terminal 114 sets the wavelength detected by the wavelength selective light intensity detector 113.
- the wavelength selective light intensity detector 113 on the receiving side measures the signal level at the time when the signal of the wavelength to be measured ( ⁇ k) exists.
- the wavelength selective light intensity detector 113 may measure the signal level of the signal in advance before the signal of the wavelength to be measured is bypassed.
- the wavelength selective light intensity detector 113 converts the signal of the measurement target wavelength ⁇ k into the bypass signal ( ⁇ d), so that the noise level at the time when the bypass wavelength ( ⁇ k) becomes a no-signal state is obtained. taking measurement.
- the wavelength selective light intensity detector 113 measures the signal level of the signal (measurement target wavelength ⁇ k) at the timing when the signal exists at the OSNR measurement target wavelength ( ⁇ k).
- the control terminal 114 may instruct the wavelength selective light intensity detector 113 to measure the signal level.
- control terminal 114 sets the transmission / reception wavelength of the bypass optical transceiver (104a, 104b) and the wavelength of the signal transmitted by the wavelength selective switch (108a, 108b) for each.
- the bypass optical transceiver 104a converts the signal of the wavelength to be measured ( ⁇ k) out of the wavelength multiplexed signals output from the optical coupler 107a (optical coupler A) into the bypass wavelength ( ⁇ d). And output.
- the wavelength selective switch 108a includes a signal other than the measurement target wavelength ( ⁇ k) among the wavelength multiplexed signals output from the optical coupler 107a (optical coupler A), and a detour signal output from the detour optical transceiver 104a ( The detour wavelength ⁇ d) is combined and sent to the transmission line.
- the wavelength selective light intensity detector 113 on the receiving side measures the noise level of the OSNR measurement target wavelength ( ⁇ k) among the wavelength multiplexed signals received from the optical coupler 107b (optical coupler B).
- the detouring optical transceiver 104b on the receiving side converts the signal of the detouring wavelength ⁇ d among the wavelength multiplexed signals output from the optical coupler 107b (optical coupler C) into a signal of the measurement target wavelength ⁇ k.
- the wavelength selective switch 108b includes a signal other than the bypass wavelength ⁇ d among the wavelength multiplexed signals output from the optical coupler 107b (optical coupler C), and a signal of the measurement target wavelength ⁇ k output from the bypass optical transceiver 104b. Are combined and output to the optical demultiplexer 112.
- the OSNR of the entire band can be measured by sequentially performing these operations from all wavelength multiplexed signal bands included in the main signal, for example, from channel 1 (wavelength ⁇ 1) to channel n (wavelength ⁇ n).
- the switching time of the wavelength selective switches (108a, 108b) is about several tens of microseconds per channel. Therefore, a continuous disconnection state (disconnection state) of traffic does not occur with such switching.
- the communication system transmission side communication system 101, reception side communication system 102 in the present embodiment, it is possible to measure the OSNR in the actual operation state without causing a continuous traffic interruption state. Is possible.
- the detouring wavelength ( ⁇ d) and the original measurement target wavelength ( ⁇ k) have the same communication capacity, it is possible to prevent or alleviate the reduction in communication speed (communication band) associated with OSNR measurement.
- the optical signal-to-noise ratio can be measured while reducing the influence on the communication environment in the optical communication system using the wavelength multiplexed signal. More specifically, according to the communication system of the present embodiment, it is possible to measure the true OSNR in a real environment affected by cable repair during operation and aging deterioration while minimizing the traffic interruption time. is there.
- FIG. 7 is a block diagram illustrating a functional configuration of the communication system in the present embodiment.
- the optical multiplexing / demultiplexing device 701 on the transmission side is different from the optical multiplexing / demultiplexing device in the first embodiment, and other configurations are the same as those in the first embodiment.
- the signal band of the main signal includes n wavelengths of wavelengths ⁇ 1 to ⁇ n, and the signal of ⁇ k, which is the wavelength of the OSNR measurement target, is not mounted (that is, traffic Assume that the data is not modulated.
- the optical multiplexing / demultiplexing device 701 generates a signal having the measurement target wavelength ⁇ k.
- the optical multiplexing / demultiplexing device 701 in the transmission-side communication system 101 is different from the optical multiplexing / demultiplexing device 105 in the first embodiment in terms of an optical coupler 703 (optical coupler D) and a wavelength tunable light source 702. And further comprising.
- Other configurations of the optical multiplexer / demultiplexer 701 may be the same as those of the optical multiplexer / demultiplexer 105 in the first embodiment.
- the variable wavelength light source 702 is a light source capable of emitting light of a specific wavelength based on a setting or control signal.
- the wavelength tunable light source 702 is connected to the control terminal 114 and emits light having a wavelength to be measured ( ⁇ d) based on a control signal from the control terminal 114.
- the optical coupler 703 (optical coupler D) combines the wavelength multiplexed signal output from the wavelength selective switch 108a and the output light output from the wavelength tunable light source 702, and sends them to the transmission line.
- the optical coupler 703 functions as an optical multiplexer.
- the optical coupler 703 may be realized by using, for example, an interference film filter using a dielectric multilayer film, a diffraction grating, or the like.
- the optical multiplexer / demultiplexer 701 configured as described above inserts the output of the wavelength tunable light source 702 to measure the signal level (FIG. 8). ).
- the wavelength selective light intensity detector 113 on the receiving side measures the noise level at the timing when the OSNR measurement target wavelength ( ⁇ k) is in the no-signal state, as in the first embodiment.
- the wavelength selective light intensity detector 113 measures the signal level when the output of the wavelength tunable light source 702 is transmitted as a signal of the OSNR measurement target wavelength ( ⁇ k).
- the communication system in this embodiment can measure the OSNR of the wavelength to be measured ( ⁇ k) in the transmission line.
- the transmission-side communication system 101 in the present embodiment has the measurement target wavelength described in the first embodiment. There is no need to execute the process of detouring and transmitting the signal.
- the communication system of the present embodiment configured as described above, it is possible to measure the OSNR of the transmission line in the actual operation state even when no signal is mounted on the wavelength to be measured. is there. This is because the optical multiplexing / demultiplexing device 701 can generate a signal having a wavelength to be measured using the variable wavelength light source 702. In addition, since there is no signal carrying traffic data, the communication system according to the present embodiment can measure the OSNR in an actual operation state without causing continuous traffic interruption. As described above, according to the communication system in the present embodiment, the optical signal-to-noise ratio can be measured while reducing the influence on the communication environment in the optical communication system using the wavelength division multiplexed signal.
- the communication system (transmission-side communication system 101, reception-side communication system 102) in the present modification may have the same configuration as in the first embodiment and the second embodiment.
- the signal band of the main signal includes n wavelengths from wavelengths ⁇ 1 to ⁇ n, and among them, ⁇ k that is the wavelength of the OSNR measurement target is not mounted (there is no signal).
- ⁇ k that is the wavelength of the OSNR measurement target is not mounted (there is no signal).
- the control terminal 114 sets the reception wavelength of the detouring optical transceiver 104a on the transmission side to the specific wavelength ⁇ m and the transmission wavelength of the detouring optical transceiver 104a to the measurement target wavelength ⁇ k.
- the bypass optical transceiver 104a receives the signal with the wavelength ⁇ m, converts it to a signal with the measurement target wavelength ⁇ k, and outputs it.
- ⁇ m is included in the signal band ( ⁇ 1 to ⁇ n) of the main signal, and is an arbitrary wavelength on which a signal carrying traffic data is mounted (there is a signal).
- the control terminal 114 sets the reception wavelength of the bypass optical transceiver 104b on the receiving side to ⁇ k and the transmission wavelength of the bypass optical transceiver 104b to the wavelength ⁇ m.
- the bypass optical transceiver 104b receives the signal of the wavelength ⁇ k to be measured, converts it to a signal of wavelength ⁇ m, and outputs it.
- a signal with a wavelength ⁇ m that is already mounted is temporarily converted into a signal with an OSNR measurement target wavelength ⁇ k that does not exist.
- the optical multiplexer / demultiplexer (105, 701) on the transmission side can generate a signal of the OSNR measurement target wavelength ⁇ k.
- the detour optical transceiver 104b on the receiving side returns (converts) the signal of the wavelength to be measured ( ⁇ k) to the signal of the original wavelength ⁇ m by performing the same processing as in the first embodiment. be able to.
- the communication system according to the present modification can measure the OSNR of the transmission line in the actual operation state even when no signal is mounted on the wavelength to be measured.
- this modification is applicable when there are few unmounted signals, for example.
- FIG. 10 is a block diagram illustrating a functional configuration of a communication apparatus according to the third embodiment of the invention.
- the communication device 1000 includes an optical multiplexing unit (optical multiplexing unit) 1001, a first converted signal generation unit (first converted signal generation unit) 1002, and a first signal selection. Section (first signal selection means) 1003.
- optical multiplexing unit optical multiplexing unit
- first converted signal generation unit first converted signal generation unit
- first signal selection means first signal selection means
- these components are communicably connected by any communication means.
- the communication means may be a communication path configured using an optical communication device.
- each component of the communication apparatus 1000 will be described.
- the optical multiplexing unit 1001 receives one or more optical signals, and generates a wavelength multiplexed signal that is an optical signal obtained by combining the optical signals.
- the optical multiplexing unit 1001 may be realized using, for example, the optical multiplexer 106 in the first and first embodiments.
- the first conversion signal generation unit 1002 receives the wavelength multiplexed signal generated in the optical multiplexing unit 1001. Then, the first conversion signal generation unit 1002 generates a conversion signal that is an optical signal obtained by selecting the signal of the first wavelength from the wavelength multiplexed signal and converting it to the signal of the second wavelength.
- the first converted signal generation unit 1002 may be realized using, for example, the optical coupler 107a and the bypass optical transceiver 104a in the first or second embodiment.
- the signal of the first wavelength may be, for example, a signal of a wavelength to be measured in each of the above embodiments.
- the signal of the second wavelength may be, for example, a signal of a detour wavelength in each of the above embodiments.
- the first signal selection unit 1003 accepts the wavelength multiplexed signal generated by the optical multiplexing unit 1001 and the conversion signal generated by the first conversion signal generation unit 1002.
- the first signal selection unit 1003 selects and outputs at least one of a signal included in the wavelength multiplexed signal and a converted signal for each wavelength of the signal.
- the first signal selection unit 1003 may select a signal other than the signal of the first wavelength and a converted signal from signals included in the wavelength multiplexed signal and output them to the optical communication path.
- the first signal selection unit 1003 may be realized using, for example, the wavelength selective switch 108a in the first or second embodiment.
- the communication apparatus 1000 can convert a signal having a first wavelength into a signal having a second wavelength, and can transmit the signal to a transmission line for optical communication. That is, the communication apparatus 1000 converts, for example, a signal having a wavelength to be measured for OSNR (a signal having a first wavelength) into a detour signal (a signal having a second wavelength) and sends the signal to a transmission path for optical communication. be able to.
- the communication device 1000 bypasses the transmission of the signal with the wavelength to be measured, thereby preventing the traffic interruption regarding the signal with the wavelength to be measured from continuing.
- the OSNR relating to the wavelength to be measured is measured without causing continuous traffic interruption relating to the signal having the wavelength to be measured.
- the communication apparatus 1000 according to the present embodiment configured as described above can realize, for example, the transmission-side communication system 101 in the first and second embodiments.
- FIG. 11 is a block diagram illustrating a functional configuration of a communication device 1100 according to the fourth embodiment of the invention.
- the communication apparatus includes a measurement unit (measurement unit) 1101, a second conversion signal generation unit (second conversion signal generation unit) 1102, and a second signal selection unit (second signal selection unit). 1103 and an optical demultiplexing unit (optical demultiplexing means) 1104.
- these components are communicably connected by any communication means.
- the communication means may be a communication path configured using an optical communication device.
- each component of the communication apparatus 1100 will be described.
- the measuring unit 1101 receives a wavelength multiplexed signal obtained by combining one or more optical signals from the optical communication path. Then, the measurement unit 1101 measures at least one of the signal level and the noise level related to the third wavelength among the wavelength multiplexed signals.
- the measurement unit 1101 may be realized using, for example, the wavelength selective light intensity detector 113 in the first and second embodiments.
- the third wavelength may be the measurement target wavelength in the first and second embodiments.
- the second conversion signal generation unit 1102 generates a restoration signal which is an optical signal obtained by selecting a signal of the fourth wavelength from the wavelength multiplexed signal and converting it to the third wavelength.
- the second converted signal generation unit 1102 may be realized using, for example, the optical coupler 107b and the bypass optical transceiver 104b in the first and second embodiments.
- the fourth wavelength may be the detour wavelength in the first and second embodiments.
- the second signal selection unit 1103 receives the wavelength multiplexed signal and the restoration signal, and at least one of the optical signal and the restoration signal included in the wavelength multiplexing signal for each wavelength of the optical signal included therein. select.
- the second signal selection unit 1103 selects, for example, a signal other than the signal of the fourth wavelength among the wavelength multiplexed signals and the restoration signal (signal converted to the third wavelength), and performs optical demultiplexing. You may output to the part 1104 (after-mentioned).
- the second signal selection unit 1103 may be realized using, for example, the wavelength selective switch 108b in the first and second embodiments.
- the optical demultiplexing unit 1104 demultiplexes the optical signal selected by the second signal selection unit 1103 based on the wavelength of the signal included in the optical signal.
- the optical demultiplexing unit 1104 may be realized using the optical demultiplexer 112 in the first and second embodiments.
- the communication device 1100 according to the present embodiment configured as described above can measure the signal level when a signal is present at the third wavelength, for example, and when the signal is not present at the third wavelength. Can measure its noise level. That is, the communication device 1100 according to the present embodiment can measure the OSNR related to the third wavelength.
- the signal of the fourth wavelength is the detour signal in the first and second embodiments
- the signal of the third wavelength is the signal of the measurement target wavelength in the first and second embodiments.
- the communication device 1100 can convert a detour wavelength (fourth wavelength) signal from among the wavelength multiplexed signals received from the optical communication path into a measurement target wavelength (third wavelength) signal.
- the communication device 1100 selects a signal having a wavelength other than the detour wavelength included in the wavelength multiplexed signal and the converted measurement target signal, and demultiplexes the selected signal for each frequency and outputs the demultiplexed signal. Is possible.
- the communication device 1100 when a signal of a wavelength to be measured is converted into a signal of a detour wavelength and transmitted, the communication device 1100 has the detour wavelength of the transmitted detour wavelength. The signal can be restored to the original signal (signal of the wavelength to be measured).
- the optical signal-to-noise ratio can be measured while reducing the influence on the communication environment in the optical communication system using the wavelength multiplexed signal.
- the communication device 1100 according to the present embodiment configured as described above can realize the reception-side communication system 102 according to each of the first and second embodiments, for example.
- the communication apparatus 1100 may include an optical coupler 1201 as illustrated in FIG.
- the optical coupler 1201 distributes the wavelength multiplexed signal transmitted from the optical communication path to the measurement unit 1101, the second conversion signal generation unit 1102, and the second signal selection unit 1103.
- Such an optical coupler 1201 may be realized using, for example, the optical coupler 107b in the first and second embodiments.
- FIG. 13 is a block diagram illustrating a functional configuration of the communication system 1300 in the present embodiment.
- the communication system 1300 includes a first communication device 1301, a second communication device 1302, and a control unit (control means) 1303.
- the control unit 1303 and the first communication device 1301 are communicably connected by an arbitrary communication unit.
- the control unit 1303 and the second communication device 1302 are communicably connected by an arbitrary communication unit.
- the first communication device 1301 and the second communication device 1302 are communicably connected via an optical communication path.
- the first communication device 1301 may be the same as the communication device 1000 in the third embodiment.
- the second communication device 1302 may be the same as the communication device 1100 in the fourth embodiment.
- the control unit 1303 sends to the first communication device 1301 a signal selected from at least one of the first wavelength and the second wavelength, and a signal included in the wavelength multiplexed signal and the converted signal. Notice.
- the control unit 1303 may transmit the notification to the first communication device 1301 using a control signal.
- control unit 1303 notifies the second communication device of at least one of the third wavelength equal to the first wavelength and the fourth wavelength equal to the second wavelength.
- the control unit 1303 notifies the second communication device of a signal selected from the signal included in the wavelength multiplexed signal received from the optical communication path and the restoration signal.
- control unit 1303 instructs the measurement unit in the second communication device to measure the noise level related to the third wavelength at a timing when a signal exists at the third wavelength. Then, the control unit 1303 instructs the measurement unit in the second communication apparatus to measure the signal level related to the third wavelength at a timing when no signal is present at the third wavelength.
- control unit 1303 may be the same as the control terminal 114 in the first and second embodiments.
- the measurement target wavelengths (first and third wavelengths) in each communication device (1301, 1302), and detours Use wavelengths (second and fourth wavelengths) are set.
- a signal included in the optical signal transmitted from the first communication device 1301 to the optical communication path is selected based on the notification from the control unit 1303.
- a signal selected in the second communication device 1302 is selected based on the notification from the control unit 1303.
- the second communication device 1302 measures the noise level and the signal level related to the wavelength of the OSNR measurement target.
- the communication system 1300 in the present embodiment it is possible to measure the OSNR related to specific wavelengths (first and third wavelengths). Further, according to the communication system 1300, a signal having a wavelength that is an OSNR measurement target is converted into a signal (a detour signal) having another wavelength (second and fourth wavelengths). To the second communication device 1302. That is, by using the first communication device 1301 and the second communication device 1302, it is possible to bypass and transmit a signal having a wavelength to be measured. It is possible to prevent the continuous traffic interruption related to occurrence. Thereby, for example, the OSNR relating to the wavelength to be measured is measured without causing a continuous traffic interruption relating to the signal having the wavelength to be measured. As described above, according to the communication system in the present embodiment, the optical signal-to-noise ratio can be measured while reducing the influence on the communication environment in the optical communication system using the wavelength division multiplexed signal.
- control terminal 114 and the control unit 1303 in each of the above embodiments may be realized using, for example, the following hardware and software programs.
- control terminal 114 and the control unit 1303 described in the above embodiments are collectively referred to simply as “control unit”.
- control unit described in each of the above embodiments may be realized using one or a plurality of dedicated hardware devices (for example, an integrated circuit or a storage device mounted with processing logic).
- control unit when the control unit is realized by a dedicated hardware device, the components of the control unit are implemented using an integrated circuit (for example, SoC (System on a Chip)) that can provide each function. Also good.
- SoC System on a Chip
- the data held by the components of the control unit is, for example, a RAM (Random Access Memory) area integrated as SoC, a flash memory area,
- the control unit described above may be configured by general-purpose hardware as exemplified in FIG. 14 and various software programs (computer programs) executed by the hardware.
- the arithmetic device 1401 may read various software programs stored in a non-volatile storage device 1403 described later to the storage device 1402 and execute processing according to the software programs.
- the components of the control unit in each of the above embodiments may be realized as a software program executed by the arithmetic device 1401.
- the storage device 1402 is a memory device such as a RAM that can be referred to from the arithmetic device 1401, and stores software programs, various data, and the like. Note that the storage device 1402 may be a volatile memory device.
- the non-volatile storage device 1403 is a non-volatile storage device such as a magnetic disk drive or a semiconductor storage device using flash memory.
- the nonvolatile storage device 1403 can store various software programs, data, and the like.
- the network interface 1406 is an interface device connected to a communication network.
- an interface device for connection to a wired or wireless telecommunication line, an interface device for connection to an optical communication line, or the like may be adopted.
- the drive device 1404 is, for example, a device that processes reading and writing of data with respect to a storage medium 1405 described later.
- the storage medium 1405 is an arbitrary storage medium capable of recording data, such as an optical disk, a magneto-optical disk, and a semiconductor flash memory.
- control unit in the present invention described by taking the above-described embodiments as an example supplies a software program capable of realizing the functions described in the above-described embodiments to, for example, the hardware device illustrated in FIG. May be realized. More specifically, for example, the present invention may be realized by causing the arithmetic device 1401 to execute a software program supplied to such a device.
- the software program may be recorded in the storage medium 1405.
- the software program may be configured to be stored in the nonvolatile storage device 1403 through the drive device 1404 as appropriate at the shipping stage or the operation stage of the control unit or the like.
- the method of supplying various software programs to the hardware is installed in the apparatus using an appropriate jig in the manufacturing stage before shipment or the maintenance stage after shipment.
- a method may be adopted.
- a method for supplying various software programs a general procedure may be adopted at present, such as a method of downloading from the outside via a communication line such as the Internet.
- the present invention can be understood to be constituted by a code constituting the software program or a computer-readable storage medium in which the code is recorded.
- the storage medium is not limited to a medium independent of the hardware device, but includes a storage medium in which a software program transmitted by various communication networks is downloaded and stored or temporarily stored.
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Abstract
Description
[構成]
以下、本発明の第1の実施形態について図面を参照して説明する。図1は、本発明の第1の実施形態に係る通信システムを構成する通信システム(送信側通信システム101、受信側通信システム102)の機能的な構成を例示するブロック図である。
次に、上記のように構成された通信システムの動作について説明する。
次に、本発明の第2の実施形態について説明する。なお、上記第1の実施形態と同様の構成については、同様の符号を付すことで重複する説明を省略する。
次に、上記第2の実施形態の変形例について説明する。本変形例における通信システム(送信側通信システム101、受信側通信システム102)は、上記第1の実施形態、第2の実施形態と同様の構成としてよい。
次に、本発明の第3の実施形態について説明する。図10は、本発明の第3の実施形態に係る通信装置の機能的な構成を例示するブロック図である。
次に、本発明の第4の実施形態について説明する。図11は、本発明の第4の実施形態に係る通信装置1100の機能的な構成を例示するブロック図である。本実施形態における通信装置は、測定部(測定手段)1101と、第2の変換信号生成部(第2の変換信号生成手段)1102と、第2の信号選択部(第2の信号選択手段)1103と、光分波部(光分波手段)1104とを備える。本実施形態において、これらの構成要素の間は、任意の通信手段により通信可能に接続されている。係る通信手段は、特には、光通信デバイスを用いて構成された通信路であってもよい。以下、通信装置1100の各構成要素について説明する。
上記第4の実施形態の変形例として、図12に例示するように、通信装置1100が光カプラ1201を備えてもよい。係る光カプラ1201は、光通信路から伝送された波長多重信号を、測定部1101と、第2の変換信号生成部1102と、第2の信号選択部1103とに、分配する。係る光カプラ1201は、例えば、上記第1及び第2の実施形態における光カプラ107bを用いて実現されてもよい。
次に、本発明の第5の実施形態について説明する。図13は、本実施形態における通信システム1300の機能的な構成を例示するブロック図である。図13に例示するように、通信システム1300は、第1の通信装置1301と、第2の通信装置1302と、制御部(制御手段)1303とを備える。制御部1303と、第1の通信装置1301との間は、任意の通信手段により通信可能に接続されている。同様に、制御部1303と、第2の通信装置1302との間は、任意の通信手段により通信可能に接続されている。また、第1の通信装置1301と、第2の通信装置1302との間は、光通信路により通信可能に接続されている。
また、上述した制御部は、図14に例示するような汎用のハードウェアと、係るハードウェアによって実行される各種ソフトウェア・プログラム(コンピュータ・プログラム)とによって構成されてもよい。
102 受信側通信システム
103 光送受信機
104 迂回用光送受信機
105 光合分波装置
106 光合波器
107 光カプラ
108 波長選択型スイッチ
109 光伝送ファイバ
110 光増幅器
111 光合分波装置
112 光分波器
113 波長選択型光強度検出器
114 制御端末
701 光合分波装置
702 波長可変光源
703 光カプラ
1000 通信装置
1001 光合波部
1002 第1の変換信号生成部
1003 第1の信号選択部
1100 通信装置
1101 測定部
1102 第2の変換信号生成部
1103 第2の信号選択部
1104 光分波部
1201 光カプラ
1300 通信システム
1301 第1の通信装置
1302 第2の通信装置
1303 制御部
1401 演算装置
1402 記憶装置
1403 不揮発性記憶装置
1404 ドライブ装置
1405 記憶媒体
1406 ネットワークインタフェース
Claims (10)
- データを搬送可能な1以上の光信号を受け付け、それらを合波した光信号である波長多重信号を生成する光合波手段と、
前記光合波手段において生成された前記波長多重信号から第1の波長の信号を選択して第2の波長の信号に変換した光信号である変換信号を生成する第1の変換信号生成手段と、
生成された前記波長多重信号と、前記変換信号とを受け付け、それらに含まれる信号の波長ごとに、前記波長多重信号に含まれる信号と、前記変換信号との少なくともいずれかを選択して出力する第1の信号選択手段と、を備える
通信装置。 - 前記第1の信号選択手段は、前記波長多重信号のうちの前記第1の波長の信号を除く信号と、前記変換信号とを選択して出力する
請求項1に記載の通信装置。 - 前記第1の変換信号生成手段は、前記第1の波長の信号を、前記波長多重信号の波長帯に含まれない波長である前記第2の波長の信号に変換することにより、前記変換信号を生成する
請求項1又は請求項2に記載の通信装置。 - ある波長の光信号を生成可能な波長可変光源と、
前記第1の信号選択手段において選択された前記波長多重信号と、前記波長可変光源から出力される光信号とを合波可能な光カプラと、を更に備え、
前記波長多重信号に、搬送するデータが変調されていない特定の波長が含まれる場合、
前記波長可変光源は、当該特定の波長と同じ波長の信号を生成し、
前記第1の信号選択手段は、前記第1の信号選択手段において選択された前記波長多重信号と、前記波長可変光源が生成した特定の波長の信号とを選択して出力する、
請求項1乃至請求項3のいずれか一項に記載の通信装置。 - 1以上の光信号が合波された波長多重信号を光通信路から受け付け、当該波長多重信号のうち、第3の波長の信号に関する信号レベルと、ノイズレベルとの少なくとも一方を測定可能な測定手段と、
前記波長多重信号から第4の波長の信号を選択して前記第3の波長に変換した光信号である復元信号を生成する第2の変換信号生成手段と、
前記波長多重信号と、前記復元信号とを受け付け、それらに含まれる光信号の波長ごとに、前記波長多重信号に含まれる光信号と、前記復元信号との少なくともいずれかを選択する第2の信号選択手段と、
前記第2の信号選択手段が選択した光信号を、当該光信号に含まれる信号の波長に基づいて分波する光分波手段と、を備える
通信装置。 - 前記第2の信号選択手段は、前記波長多重信号のうちの前記第4の波長の信号を除く信号と、前記復元とを選択する
請求項5に記載の通信装置。 - 前記測定手段は、
前記第3の波長に信号が存在するタイミングにおいて、当該第3の波長の信号に関するノイズレベルを測定し、
前記第3の波長に信号が存在しないタイミングにおいて、当該第3の波長に関する信号レベルを測定する
請求項5又は請求項6に記載の通信装置。 - 請求項1乃至請求項4のいずれか一項に記載の通信装置である第1の通信装置と、
請求項5乃至請求項7のいずれか一項に記載の通信装置である第2の通信装置と、
前記第1及び第2の通信装置と通信可能に接続され、
前記第1の波長と前記第2の波長との少なくとも一方、並びに、前記波長多重信号に含まれる信号と前記変換信号とから選択される信号を前記第1の通信装置に通知し、
前記第1の波長と等しい前記第3の波長と、前記第2の波長と等しい前記第4の波長との少なくとも一方、並びに、前記光通信路から受信した前記波長多重信号に含まれる信号と前記復元信号とから選択される信号を前記第2の通信装置に通知し、
前記第3の波長に信号が存在するタイミングにおいて、前記第2の通信装置における前記測定手段に前記第3の波長に関するノイズレベルの測定を指示し、
前記第3の波長に信号が存在しないタイミングにおいて、前記第2の通信装置における前記測定手段に前記第3の波長に関する信号レベルの測定を指示する、
制御手段と、を備える
通信システム。 - 1以上の光信号を受け付け、それらを合波した光信号である波長多重信号を生成し、
前記生成された前記波長多重信号から第1の波長の信号を選択して第2の波長の信号に変換した光信号である変換信号を生成し、
生成された前記波長多重信号と、前記変換信号と含まれる信号の波長ごとに、前記波長多重信号に含まれる信号と、前記変換信号との少なくともいずれかを選択して出力する
通信方法。 - 1以上の光信号が合波された波長多重信号を光通信路から受け付け、当該波長多重信号のうち、第3の波長の信号に関する信号レベルと、ノイズレベルとの少なくとも一方を測定し、
前記波長多重信号から第4の波長の信号を選択して前記第3の波長に変換した光信号である復元信号を生成し、
前記波長多重信号と、前記復元信号とに含まれる光信号の波長ごとに、前記波長多重信号に含まれる光信号と、前記復元信号との少なくともいずれかを選択するとともに、当該選択した光信号を、当該光信号に含まれる信号の波長に基づいて分波する
通信方法。
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