WO2011161929A1 - 波長多重伝送装置 - Google Patents
波長多重伝送装置 Download PDFInfo
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- WO2011161929A1 WO2011161929A1 PCT/JP2011/003499 JP2011003499W WO2011161929A1 WO 2011161929 A1 WO2011161929 A1 WO 2011161929A1 JP 2011003499 W JP2011003499 W JP 2011003499W WO 2011161929 A1 WO2011161929 A1 WO 2011161929A1
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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
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0206—Express channels arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
Definitions
- the present invention relates to a wavelength division multiplexing transmission apparatus having a pass-through function, which stabilizes output light even when the wavelength division multiplexing input is cut off.
- the receiving unit separates the input wavelength division multiplexed light for each wavelength, and demodulates the wavelength light into the original signal. Further, the transmission unit modulates a plurality of signals into different wavelength lights, and multiplexes and transmits the wavelength lights.
- Some of these wavelength division multiplex transmission apparatuses have a pass-through function.
- the pass-through function is characterized in that, among the wavelength multiplexed light input from the transmission path, wavelength multiplexed light having a wavelength not terminated at the station is transmitted as it is to the next station.
- the optical amplification section first amplifies the wavelength division multiplexed light input from the transmission path a. , 1: 2 is output to the branching unit. This optical amplifying unit functions to compensate for transmission line loss.
- the 1: 2 branching unit demultiplexes the wavelength multiplexed light into two, outputs one wavelength multiplexed light to the wavelength separation unit, and outputs the other wavelength multiplexed light to the wavelength filter of the transmission unit 2 (pass-through).
- the wavelength separation unit separates the wavelength multiplexed light into wavelength light for each wavelength, and outputs the light to the wavelength conversion unit.
- the wavelength conversion unit demodulates each wavelength light into the original signal, and outputs it to the signal reception unit as reception data.
- the wavelength conversion unit modulates the transmission data input from the signal transmission unit into each wavelength light for each signal, and outputs it to the wavelength multiplexing unit.
- the wavelength multiplexing unit wavelength-multiplexes each wavelength light and outputs it to the 2: 1 multiplexing unit.
- the wavelength filter blocks the wavelength-multiplexed light having a wavelength that is terminated by the authorities out of the wavelength-multiplexed light that has been passed through from the receiving unit, and passes only the wavelength-multiplexed light having a wavelength that is not terminated by the authorities. Output to the multiplexer.
- the 2: 1 multiplexing unit multiplexes the wavelength multiplexed light from the wavelength multiplexing unit and the wavelength multiplexed light from the wavelength filter, and outputs them to the optical amplification unit.
- the optical amplifying unit amplifies the wavelength division multiplexed light and sends it to the wavelength division multiplexing transmission apparatus of the next station via the transmission path b.
- the output of the optical amplification unit is kept constant by controlling the amplification factor of the optical amplification unit based on the number of wavelengths input to the optical amplification unit and the output of the optical amplification unit at that time.
- the output of the optical amplification unit is kept constant by controlling the amplification factor of the optical amplification unit based on the number of wavelengths input to the optical amplification unit and the output of the optical amplification unit at that time.
- An object of the present invention is to provide a wavelength division multiplexing transmission apparatus capable of performing
- the wavelength division multiplexing transmission apparatus includes a dummy light source that emits and extinguishes dummy light, a monitor unit that monitors an optical level related to the received wavelength division multiplexed light, and wavelength multiplexing based on the light level monitored by the monitor unit.
- a dummy light control unit that emits dummy light to the dummy light source and a multiplexing unit that combines the modulated wavelength light and the dummy light emitted from the dummy light source when the light is determined to be in an input-off state.
- the transmission unit transmits the wavelength multiplexed light generated by the multiplexing unit.
- the dummy light source for emitting / quenching the dummy light
- the monitor unit for monitoring the light level of the received wavelength multiplexed light
- the wavelength multiplexed light being interrupted based on the light level monitored by the monitor unit.
- a transmission unit comprising: a dummy light control unit that causes the dummy light source to emit dummy light when determined to be in a state; and a multiplexing unit that combines the modulated wavelength light and the dummy light emitted from the dummy light source.
- FIG. 1 is a diagram for explaining a pass-through function of a wavelength division multiplexing transmission apparatus according to Embodiment 1 of the present invention.
- FIG. 1 four wavelength division multiplexing transmission devices (terminal stations A to D) are provided, and wavelength division multiplexing transmission devices are connected via two transmission paths (for transmission and reception) to form a ring network.
- a wavelength multiplexing system is shown.
- each wavelength multiplexing transmission apparatus transmits wavelength multiplexed light between adjacent wavelength multiplexing transmission apparatuses (for example, terminal station A and terminal station B) via a transmission line.
- wavelength multiplexed light is passed through the terminal station B and transmitted to the terminal station C.
- the wavelength multiplexed light from the terminal station C is passed through the terminal station B and transmitted to the terminal station A.
- the wavelength multiplexed light from the terminal station C is passed through the terminal station B and transmitted to the terminal station A.
- the wavelength multiplexed light is similarly passed through the terminal station D.
- FIG. 2 is a diagram showing the configuration of the wavelength division multiplexing transmission apparatus according to Embodiment 1 of the present invention.
- FIG. 2 shows a case where wavelength multiplexed light is transmitted from the transmission path a to the transmission path b.
- the wavelength division multiplex transmission apparatus includes a receiver 1 and a transmitter 2.
- the receiving unit 1 separates the wavelength multiplexed light input from the transmission line a for each wavelength and demodulates the original signal.
- the receiving unit 1 includes an optical amplification unit 11, a 1: 2 demultiplexing unit 12, a wavelength separation unit 13, and a wavelength conversion unit 14.
- the optical amplifying unit 11 amplifies the wavelength multiplexed light input from the transmission line a and fulfills the function of compensating for the transmission line loss.
- the wavelength multiplexed light amplified by the optical amplifying unit 11 is output to the 1: 2 demultiplexing unit 12.
- the 1: 2 demultiplexing unit 12 demultiplexes the wavelength multiplexed light amplified by the optical amplifying unit 11 into two.
- One wavelength multiplexed light demultiplexed by the 1: 2 demultiplexing unit 12 is output to the wavelength demultiplexing unit 13, and the other wavelength multiplexed light is output (pass-through) to the transmission unit 2.
- the wavelength separation unit 13 separates the wavelength multiplexed light input through the 1: 2 demultiplexing unit 12 into wavelength light for each wavelength. Each wavelength light separated by the wavelength separation unit 13 is output to the wavelength conversion unit 14.
- the wavelength conversion unit 14 demodulates each wavelength light separated by the wavelength separation unit 13 into an original signal. Each signal demodulated by the wavelength converter 14 is output as received data to a signal receiver (not shown).
- the transmission unit 2 modulates a plurality of signals into different wavelength lights, multiplexes them, and sends them to the transmission line b.
- the transmitter 2 includes a wavelength converter 21, a wavelength multiplexer 22, a 2: 1 multiplexer 23, a wavelength filter 24, a 1: 2 demultiplexer 25, a monitor 26, a dummy light controller 27, a dummy light source 28, A 2: 1 multiplexer 29 and an optical amplifier 30 are included.
- the wavelength conversion unit 21 modulates transmission data input from a signal transmission unit (not shown) into wavelength light for each signal. Each wavelength light modulated by the wavelength converting unit 21 is output to the wavelength multiplexing unit 22.
- the wavelength multiplexing unit 22 wavelength-multiplexes a plurality of wavelength lights modulated by the wavelength conversion unit 21.
- the wavelength multiplexed light multiplexed by the wavelength multiplexing unit 22 is output to the 2: 1 multiplexing unit 29.
- the 2: 1 multiplexer 23 multiplexes the wavelength multiplexed light passed through by the receiver 1 and the dummy light emitted by the dummy light source 28.
- the wavelength multiplexed light combined by the 2: 1 multiplexer 23 is output to the wavelength filter 24.
- the wavelength filter 24 blocks the wavelength-multiplexed light having a wavelength that is terminated by the authorities out of the wavelength-multiplexed light input through the 2: 1 multiplexer 23, and passes only the wavelength-multiplexed light having a wavelength that is not terminated by the authorities. Is.
- the wavelength multiplexed light passed through by the wavelength filter 24 is output to the 1: 2 demultiplexing unit 25.
- the 1: 2 demultiplexing unit 25 demultiplexes the wavelength multiplexed light output from the wavelength filter 24 into two. One wavelength multiplexed light demultiplexed by the 1: 2 demultiplexing unit 25 is output to the 2: 1 multiplexing unit 29, and the other wavelength multiplexed light is output to the monitor unit 26.
- the monitor unit 26 monitors the optical level of the wavelength multiplexed light input via the 1: 2 demultiplexing unit 25 and confirms the input state of the wavelength multiplexed light.
- the monitor unit 26 determines that the wavelength-division multiplexed light is normally input.
- the monitor unit 26 determines that the wavelength multiplexed light is not normally input (the input is cut off). The result of the wavelength multiplexed light input state by the monitor unit 26 is notified to the dummy light control unit 27.
- the monitor unit 26 restores the wavelength multiplexed light from the input cut-off state to the normal state when the monitored light level becomes higher than the expected value.
- the dummy light control unit 27 is notified of that fact.
- the dummy light control unit 27 is configured to prevent the dummy light from being emitted when the result indicates normality (wavelength multiplexed light is normally input) based on the input state result notification from the monitor unit 26. 28 is controlled. On the other hand, if the result indicates an abnormality (wavelength multiplexed light is in the input cut-off state), the dummy light source 28 is controlled to emit dummy light. Also, the dummy light control unit 27 controls the dummy light source 28 so as to stop the emission of the dummy light when receiving the normal recovery notification of the wavelength multiplexed light from the monitor unit 26.
- the dummy light source 28 emits / extinguishes dummy light according to control by the dummy light control unit 27.
- the dummy light source 28 uses a light source (for example, an ASE (Amplified Spontaneous Emission) light source) that can cover all wavelengths used in the wavelength division multiplexing transmission apparatus.
- the light level of the dummy light from the dummy light source 28 is set in advance to a value equivalent to the light level of the wavelength multiplexed light passed through by the receiving unit 1 so as to be equivalent to the case where the output of the wavelength filter 24 is normal.
- the dummy light emitted from the dummy light source 28 is output to the 2: 1 multiplexer 23.
- the 2: 1 multiplexing unit 29 multiplexes the wavelength multiplexed light wavelength-multiplexed by the wavelength multiplexing unit 22 and the wavelength multiplexed light input from the wavelength filter 24 via the 1: 2 demultiplexing unit 25. .
- the wavelength multiplexed light combined by the 2: 1 multiplexer 29 is output to the optical amplifier 30.
- the optical amplifying unit 30 amplifies the wavelength multiplexed light combined by the 2: 1 combining unit 29.
- the wavelength multiplexed light amplified by the optical amplifying unit 30 is transmitted to the transmission line b.
- FIG. 4 is a flowchart showing the operation of the receiving unit 1 according to Embodiment 1 of the present invention.
- the optical amplifying unit 11 amplifies the wavelength multiplexed light input from the transmission path a (step ST41).
- the wavelength multiplexed light input from the transmission line a includes wavelength light having a transmission wavelength that is terminated by the authority and wavelength light having a pass-through wavelength that is not terminated by the authority (pass-through to the next station). It is configured.
- the wavelength multiplexed light amplified by the optical amplifying unit 11 is output to the 1: 2 demultiplexing unit 12.
- the 1: 2 demultiplexing unit 12 demultiplexes the wavelength multiplexed light amplified by the optical amplification unit 11 into two (step ST42).
- One wavelength multiplexed light demultiplexed by the 1: 2 demultiplexing unit 12 is output to the wavelength demultiplexing unit 13, and the other wavelength multiplexed light is output (pass-through) to the transmission unit 2.
- the wavelength demultiplexing unit 13 demultiplexes the wavelength multiplexed light demultiplexed by the 1: 2 demultiplexing unit 12 into wavelength light for each wavelength (step ST43).
- the wavelength light separated by the wavelength separation unit 13 is output to the wavelength conversion unit 14.
- the wavelength converting unit 14 demodulates each wavelength light separated by the wavelength separating unit 13 into an original signal (step ST44).
- the signal demodulated by the wavelength converter 14 is output as reception data to the signal receiver.
- FIG. 6 is a flowchart showing the wavelength multiplexed light transmission operation of the transmitter 2 in the first embodiment of the present invention.
- the wavelength conversion unit 21 modulates transmission data input from the signal transmission unit into wavelength light for each signal (step ST61). Each wavelength light modulated by the wavelength converting unit 21 is output to the wavelength multiplexing unit 22.
- the wavelength multiplexing unit 22 wavelength-multiplexes each wavelength light modulated by the wavelength conversion unit 21 (step ST62).
- the wavelength multiplexed light wavelength-multiplexed by the wavelength multiplexing unit 22 is composed of wavelength light having a transmission wavelength as shown in FIG.
- the wavelength multiplexed light multiplexed by the wavelength multiplexing unit 22 is output to the 2: 1 multiplexing unit 29.
- the wavelength filter 24 blocks the wavelength multiplexed light having a wavelength that terminates in the authority from among the wavelength multiplexed light that is passed through by the receiver 1 through the 2: 1 multiplexer 23, and has a wavelength that does not terminate in the authority. Only wavelength multiplexed light is allowed to pass (step ST63).
- the wavelength filter 24 has a filter characteristic as shown in FIG. 8, and passes only wavelength-multiplexed light having a pass-through wavelength as shown in FIG. The wavelength multiplexed light that is passed through and output by the wavelength filter 24 is output to the 2: 1 multiplexing unit 29 via the 1: 2 demultiplexing unit 25.
- the 2: 1 multiplexing unit 29 multiplexes the wavelength multiplexed light wavelength-multiplexed by the wavelength multiplexing unit 22 and the wavelength multiplexed light input from the wavelength filter 24 via the 1: 2 demultiplexing unit 25 (Ste ST64).
- the wavelength multiplexed light combined by the 2: 1 multiplexer 29 becomes wavelength multiplexed light composed of the wavelength light of the transmission wavelength and the wavelength light of the pass-through wavelength.
- the wavelength multiplexed light combined by the 2: 1 multiplexer 29 is output to the optical amplifier 30.
- the optical amplifying unit 30 amplifies the wavelength multiplexed light combined by the 2: 1 multiplexing unit 29 (step ST65).
- the wavelength multiplexed light amplified by the optical amplifying unit 30 is transmitted to the transmission line b.
- FIG. 10 is a flowchart showing the operation of checking the input state of wavelength multiplexed light in the transmitter 2 according to Embodiment 1 of the present invention.
- the monitor 26 monitors the wavelength multiplexed light input from the wavelength filter 24 via the 1: 2 demultiplexer 25. Then, it is determined whether or not wavelength division multiplexed light is normally input (step ST101). That is, the monitor unit 26 determines that the wavelength multiplexed light is normally input when the monitored light level matches the preset expected value, and determines that the wavelength multiplexed light is smaller than the expected value. Is determined not to be entered correctly.
- the dummy light control unit 27 controls the dummy light source 28 so as not to emit the dummy light ( Step ST102).
- step ST101 determines in step ST101 that the wavelength division multiplexed light is not normally input (the input is cut off)
- the dummy light control unit 27 causes the dummy light to be emitted.
- the dummy light source 28 is controlled (step ST103).
- a failure occurs in the transmission path a, and wavelength multiplexing to the receiver 1 of the terminal station B is performed.
- the output of the optical amplifier 30 becomes lower than the normal value and becomes unstable.
- step ST103 as shown in FIG.
- the dummy light is emitted from the dummy light source 28 of the terminal station B, so that the dummy light as shown in FIG.
- the dummy light output from the 2: 1 multiplexer 23 becomes only a wavelength component that does not terminate by the authority, as shown in FIG.
- the 2: 1 multiplexing unit 29 combines the wavelength multiplexed light from the wavelength multiplexing unit 22 into the wavelength multiplexed light as shown in FIG. In this way, by compensating the pass-through target wavelength multiplexed light in the input-off state with dummy light, the output of the optical amplifying unit 30 becomes a value equivalent to the normal value and is stabilized. Since the dummy light does not include a signal component, an abnormality is detected at a station (terminal station C) that is terminated after the next stage.
- the dummy light control unit 27 controls the dummy light source 28 so as to continue the emission of the dummy light. Thereafter, when the failure of the transmission path a disappears and the wavelength multiplexed light is restored from the input cut-off state to the normal state, the wavelength multiplexed light passed through the 2: 1 multiplexer 23 and the dummy light are multiplexed. It will be.
- the monitor unit 26 can detect that the monitored light level is higher than the expected value and the wavelength multiplexed light is restored to the normal state. This is notified to the dummy light control unit 27, and the dummy light control unit 27 controls the dummy light source 28 so as to stop the emission of the dummy light.
- the optical level of the wavelength multiplexed light output by the wavelength filter 24 is monitored without controlling the amplification factor of the optical amplifying unit 30, and the wavelength multiplexed light is disconnected.
- the output of the optical amplifying unit 30 is kept constant without amplifying the noise component even when a failure occurs in the transmission path a. Transmission quality can be kept high.
- FIG. FIG. 15 is a diagram showing a configuration of a wavelength division multiplexing transmission apparatus according to Embodiment 2 of the present invention.
- the wavelength division multiplexing transmission apparatus according to Embodiment 2 shown in FIG. 15 deletes the 1: 2 demultiplexing section 25 and the monitoring section 26 from the transmission section 2 of the wavelength division multiplexing transmission apparatus according to Embodiment 1 shown in FIG.
- the wavelength conversion unit 14 of the reception unit 1 is changed to a wavelength conversion unit 15.
- Other configurations are the same, and the same reference numerals are given and description thereof is omitted.
- FIG. 16 is a diagram showing a configuration of the wavelength converter 15 in the second embodiment of the present invention.
- the wavelength conversion unit 15 demodulates each wavelength light separated by the wavelength separation unit 13 into an original signal.
- the wavelength converting unit 15 has sub-blocks 151 for demodulating light having a predetermined wavelength into an original signal for the number of wavelengths.
- Each sub-block 151 includes a 1: 2 demultiplexing unit 152, a reception data conversion unit 153, and a monitor unit 154.
- the wavelength conversion unit 15 includes a monitoring unit 155.
- the 1: 2 demultiplexing unit 152 demultiplexes the wavelength light separated by the wavelength demultiplexing unit 13 into two. One wavelength light demultiplexed by the 1: 2 demultiplexing unit 152 is output to the reception data conversion unit 153, and the other wavelength light is output to the monitor unit 154.
- the reception data converter 153 demodulates the wavelength light input from the wavelength separator 13 via the 1: 2 demultiplexer 152 into the original signal.
- the signal demodulated by the reception data conversion unit 153 is output to the signal reception unit as reception data.
- the monitor unit 154 monitors the light level of the wavelength light input from the wavelength separation unit 13 via the 1: 2 demultiplexing unit 152 and confirms the input state of the wavelength light.
- the monitor unit 154 is already provided for confirming the input state of individual wavelength light.
- the monitor unit 154 determines that the wavelength light is normally input when the monitored light level matches the preset expected value.
- the monitor unit 154 determines that the wavelength light is not normally input (the input is cut off).
- the monitoring unit 155 is notified of the input state result of the wavelength light by the monitoring unit 154.
- the monitor unit 154 determines that the wavelength light has been restored from the input-off state to the normal state when the monitored light level matches the expected value. Then, this is notified to the monitoring unit 155.
- the monitoring unit 155 aggregates the wavelength light input state results from the respective monitor units 154 and monitors the input states of all the wavelength lights. The result of the input state of all wavelengths by the monitoring unit 155 is output to the dummy light control unit 27. In addition, when the monitoring unit 155 determines that all the wavelength lights have recovered from the input-off state to the normal state, the monitoring unit 155 notifies the dummy light control unit 27 to that effect.
- the dummy light control unit 27 is configured so that the dummy light is not emitted when the result indicates normal (wavelength light is normally input) based on the input state result notification from the monitoring unit 155.
- the light source 28 is controlled.
- the dummy light source 28 is controlled to emit dummy light.
- the dummy light control unit 27 controls the dummy light source 28 so as to stop the emission of the dummy light when the normal light recovery notification of the wavelength light is input from the monitoring unit 155.
- the signal is demultiplexed by the 1: 2 demultiplexing unit 12 and separated by the wavelength demultiplexing unit 13. Since the input state of the wavelength-division multiplexed light demultiplexed and passed through by the 1: 2 demultiplexing unit 12 is confirmed by monitoring each wavelength light, the ratio is 1: 5 compared to the first embodiment.
- the second demultiplexing unit 25 and the monitor unit 26 can be eliminated, and the number of components can be reduced (additional components are not required).
- the wavelength light that passes through and the wavelength light that modulates transmission data have been described as wavelength multiplexed light in which a plurality of different wavelengths of light are multiplexed.
- the wavelength light obtained by modulating the light and transmission data may be a single wavelength light.
- the wavelength division multiplexing transmission apparatus can maintain the output of the optical amplifying unit at the transmission unit constant without amplifying the noise component even when a failure occurs in the transmission line, Since it is configured so that the quality can be kept high, in a wavelength division multiplexing transmission apparatus having a pass-through function, it is used for a wavelength division multiplexing transmission apparatus that stabilizes output light even when the wavelength division multiplexing input is cut off. Suitable for
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Abstract
Description
この波長多重伝送装置において、パススルー機能を有したものが存在する。パススルー機能とは、伝送路から入力した波長多重光のうち、その局で終端しない波長の波長多重光をそのまま次局に伝送することを特徴としたものである。
一方、波長フィルタは、受信部からパススルーされてきた波長多重光のうち、当局で終端する波長の波長多重光をブロックして、当局で終端しない波長の波長多重光のみをスルーして2:1合波部へ出力する。
次いで、2:1合波部は、波長多重部からの波長多重光と、波長フィルタからの波長多重光とを合波して、光増幅部へ出力する。次いで、光増幅部は、波長多重光を増幅して伝送路bを介して次局の波長多重伝送装置へ送出する。
すなわち、伝送路aで障害が発生して受信部への波長多重光が入力断状態となった場合、信号送信部からの送信データによる波長光は送信部の波長変換部で生成されるが、当局でパススルーする波長多重光は存在しない。そのため、光増幅部の出力が通常値から変動してしまい、伝送路の品質が低下してしまうことになる。
なお、波長多重伝送装置がパススルーする波長光、入力した送信データを変調した波長光は、どちらも複数の異なる波長の光が多重された波長多重光であるとして説明を行う。
実施の形態1.
まず、波長多重伝送装置が有するパススルー機能について説明する。
図1はこの発明の実施の形態1に係る波長多重伝送装置のパススルー機能を説明する図である。図1では、4つの波長多重伝送装置(端局A~D)を備え、波長多重伝送装置間が2つの伝送路(送信用、受信用)を介して接続され、リング状のネットワークが構成された波長多重システムについて示している。
各波長多重伝送装置は、図1の実線で示すように、隣接する波長多重伝送装置間(例えば端局Aと端局B)で伝送路を介して波長多重光を伝送している。
以上のように、ある局に入力される波長多重光のうち、その局で終端しない波長の波長多重光をパススルーすることで次局に伝送することが可能となる。
図2はこの発明の実施の形態1に係る波長多重伝送装置の構成を示す図である。この図2では、伝送路aから伝送路bに向けて波長多重光を伝送する場合について示す。
波長多重伝送装置は、図2に示すように、受信部1および送信部2とから構成される。
また、モニタ部26は、波長多重光が入力断状態であると判定した後、監視している光レベルが期待値より大きくなった場合には、波長多重光が入力断状態から正常状態に復旧したと判定して、その旨をダミー光制御部27へ通知する。
また、ダミー光制御部27は、モニタ部26から波長多重光の正常復旧通知を入力した場合には、ダミー光の発光を停止させるようにダミー光源28を制御する。
このダミー光源28により発光されたダミー光は2:1合波部23へ出力される。
光増幅部30は、2:1合波部29により合波された波長多重光を増幅するものである。この光増幅部30により増幅された波長多重光は伝送路bへ送出される。
図4はこの発明の実施の形態1における受信部1の動作を示すフローチャートである。
図6はこの発明の実施の形態1における送信部2の波長多重光送出動作を示すフローチャートである。
次いで、光増幅部30は、2:1合波部29により合波された波長多重光を増幅する(ステップST65)。この光増幅部30により増幅された波長多重光は伝送路bへ送出される。
図10はこの発明の実施の形態1における送信部2の波長多重光の入力状態確認動作を示すフローチャートである。
しかしながら、ステップST103において、図12に示すように、端局Bのダミー光源28からダミー光を発光させることで、2:1合波部23からは、図3に示すようなダミー光が出力される。この2:1合波部23から出力されたダミー光は、波長フィルタ24により、図13に示すように、当局で終端しない波長成分のみとなる。次いで、2:1合波部29により、波長多重部22からの波長多重光と合波されて、図14に示すような波長多重光となる。このように、入力断状態のパススルー対象の波長多重光をダミー光で補填することで、光増幅部30出力は通常値と同等の値となり安定する。
なお、ダミー光は信号成分を含んでいないため、次段以降の終端される局(端局C)で異常が検出される。
その後、伝送路aの障害がなくなり、波長多重光が入力断状態から正常状態に復旧した場合には、2:1合波部23でパススルーされた波長多重光とダミー光とが合波されることになる。そのため、モニタ部26では、監視している光レベルが期待値より大きくなり、波長多重光が正常状態に復旧したことを検知することができる。この旨はダミー光制御部27に通知され、ダミー光制御部27はダミー光の発光を停止させるようにダミー光源28を制御する。
図15はこの発明の実施の形態2に係る波長多重伝送装置の構成を示す図である。図15に示す実施の形態2に係る波長多重伝送装置は、図2に示す実施の形態1に係る波長多重伝送装置の送信部2から1:2分波部25およびモニタ部26を削除し、受信部1の波長変換部14を波長変換部15に変更したものである。その他の構成は同様であり、同一の符号を付してその説明を省略する。
波長変換部15は、波長分離部13により分離された各波長光を元の信号に復調するものである。この波長変換部15は、図16に示すように、所定波長の波長光を元の信号に復調するサブブロック151を波長数分有している。各サブブロック151は、1:2分波部152、受信データ変換部153、モニタ部154から構成される。また、波長変換部15は、監視部155を有している。
また、モニタ部154は、波長光が入力断状態であると判定した後、監視している光レベルが期待値と一致した場合には、波長光が入力断状態から正常状態に復旧したと判定して、その旨を監視部155へ通知する。
また、監視部155は、全ての波長光が入力断状態から正常状態に復旧したと判定した場合には、その旨をダミー光制御部27へ通知する。
また、ダミー光制御部27は、監視部155から波長光の正常復旧通知を入力した場合には、ダミー光の発光を停止させるようにダミー光源28を制御する。
Claims (4)
- 受信した波長多重光を分波して、一方を復調し受信データを出力すると共に他方をパススルーする受信部と、入力した送信データにより変調した波長光と前記受信部からパススルーされた波長光を合波して、波長多重光を送信する送信部とを備えた波長多重伝送装置において、
ダミー光を発光/消光するダミー光源と、
前記受信した波長多重光に係る光レベルを監視するモニタ部と、
前記モニタ部により監視された光レベルに基づいて前記波長多重光が入力断状態であると判定された場合に、前記ダミー光源にダミー光を発光させるダミー光制御部と、
前記変調した波長光と前記ダミー光源により発光されたダミー光を合波する合波部とを備え、
前記送信部が前記合波部により生成された波長多重光を送信する
ことを特徴とする波長多重伝送装置。 - 前記モニタ部が監視する波長多重光に係る光レベルは、当該波長多重光から分波されパススルーされる波長光の光レベルである
ことを特徴とする請求項1記載の波長多重伝送装置。 - 前記モニタ部が監視する波長多重光に係る光レベルは、当該波長多重光から分波され復調される波長光の光レベルである
ことを特徴とする請求項1記載の波長多重伝送装置。 - 前記ダミー光源により発光されるダミー光は、前記受信部によりパススルーされる波長光と同等の光レベルに設定される
ことを特徴とする請求項1記載の波長多重伝送装置。
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EP11797818.9A EP2587701B1 (en) | 2010-06-24 | 2011-06-20 | Wavelength-division multiplexing transmission device |
US13/583,958 US8805185B2 (en) | 2010-06-24 | 2011-06-20 | Wavelength-division multiplexing transmission device |
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EP2587701A4 (en) | 2016-08-31 |
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US8805185B2 (en) | 2014-08-12 |
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