WO2014038036A1 - 波長監視システム、及び波長監視方法 - Google Patents
波長監視システム、及び波長監視方法 Download PDFInfo
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- WO2014038036A1 WO2014038036A1 PCT/JP2012/072736 JP2012072736W WO2014038036A1 WO 2014038036 A1 WO2014038036 A1 WO 2014038036A1 JP 2012072736 W JP2012072736 W JP 2012072736W WO 2014038036 A1 WO2014038036 A1 WO 2014038036A1
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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
- H04B10/07—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
- H04B10/07957—Monitoring or measuring wavelength
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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
- H04B10/27—Arrangements for networking
- H04B10/272—Star-type networks or tree-type networks
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- the present invention relates to a wavelength monitoring system and a wavelength monitoring method for monitoring the wavelength of an optical signal flowing in a wavelength division multiplexing network.
- PON Passive Optical ⁇ Network
- PON Passive Optical ⁇ Network
- an optical subscriber line terminator installed in an equipment center operated by a telecommunications carrier
- a plurality of optical subscriber line network devices installed in the user's home are connected by an optical fiber network.
- the trunk optical fiber connected to the optical subscriber line terminating device is branched by a splitter into a plurality of branch optical fibers of about 8 to 64, and an optical subscriber line network device is connected to each branch optical fiber.
- a wavelength division multiplexing system that assigns different wavelengths to upstream optical signals is known. According to the wavelength division multiplexing system, a plurality of communication carriers can use one PON.
- an object of the present invention is to monitor the wavelength of an optical signal flowing in a wavelength division multiplexing network.
- a wavelength monitoring system includes an optical branching unit that extracts a part of an optical signal flowing through a wavelength division multiplexing network, an optical spectrum analysis device that analyzes the wavelength of the extracted optical signal, and Is provided.
- FIG. 1 is a block diagram illustrating a configuration of a wavelength monitoring system according to Embodiment 1.
- FIG. 6 is a block diagram illustrating a configuration of a wavelength monitoring system according to a second embodiment.
- FIG. 10 is a block diagram illustrating a configuration of a wavelength monitoring system according to a third embodiment.
- FIG. 10 is a block diagram illustrating a configuration of a wavelength monitoring system according to a fourth embodiment.
- FIG. 1 is a block diagram showing a configuration of a wavelength monitoring system 10 according to the present embodiment.
- the wavelength division multiplexing network 20 uses a wavelength division multiplexing between a plurality of optical subscriber line termination units (OLTs) 31 to 34 and a plurality of optical subscriber line network units (ONUs) 41 to 48 to transmit downstream optical signals and uplinks. This is a PON (TDM / WDM-PON) for time division multiplexing transmission of optical signals.
- the wavelength division multiplexing network 20 includes a plurality of splitters 22 for branching the optical fiber 21 from the main line to the branch lines, and a plurality of different wavelengths transmitted from the optical subscriber line terminating devices 31 to 34 to the optical subscriber line network devices 41 to 48.
- Downlink optical signals S D1 , S D2 , S D3 , S D4 are multiplexed and a plurality of upstream lights having different wavelengths transmitted from the optical subscriber line network devices 41 to 48 to the optical subscriber line termination devices 31 to 34 And a wavelength multiplexer / demultiplexer 23 for demultiplexing the signals S U1 , S U2 , S U3 , S U4 .
- All the downstream optical signals S D1 , S D2 , S D3 , S D4 are inputted to the respective optical subscriber line network devices 41 to 48, but are installed in the optical subscriber line network devices 41 to 48. By the operation of the optical filter, only the downstream optical signal addressed to the own device is extracted.
- the upstream optical signals S U1 , S U2 , S U3 , S U4 from the optical subscriber line network devices 41 to 48 to the optical subscriber line termination devices 31 to 34 are transmitted between upstream signals having the same wavelength. Are time-division multiplexed so that they do not overlap each other.
- the OLT control device 30 controls transmission / reception of optical signals by the respective optical subscriber line terminating devices 31 to 34.
- the wavelength monitoring system 10 includes an optical branching unit 11 that extracts a part of a downstream optical signal and a part of an upstream optical signal flowing through the wavelength multiplexing network 20, and an optical spectrum analyzer 12 that analyzes the wavelength of the extracted downstream optical signal. And an optical spectrum analyzer 13 for analyzing the wavelength of the extracted upstream optical signal, and information on the wavelength and intensity of the downstream optical signal from the optical spectrum analyzer 12, and the upstream optical signal from the optical spectrum analyzer 13 And a signal processing device 14 for receiving information on the wavelength and intensity.
- the optical branching device 11 includes input / output ports A and B for inputting and outputting optical signals, and branch output ports C and D for branching and outputting a part of the input optical signals at a predetermined ratio. Yes.
- the input / output ports A and B are connected to the trunk portion of the optical fiber 21 (between the wavelength multiplexer / demultiplexer 23 and the splitter 22), while the branch output ports C and D are respectively connected to the optical spectrum analyzer 13, 12 is connected.
- the optical signal is branched and output at a ratio of 9: 1
- 90% of the downstream optical signal input to the input / output port A is output to the input / output port B, and the remaining 10% is the branched output port D. Is output.
- 90% of the upstream optical signal input to the input / output port B is output to the input / output port A, and the remaining 10% is output to the branch output port C.
- the optical spectrum analyzers 12 and 13 are devices for analyzing wavelength components included in an optical signal and obtaining information on the wavelength and its intensity.
- a known monochromator can be used.
- the monochromator spatially disperses a wide range of light and extracts only a narrow range of wavelengths with a diffraction grating, etc., and rotates the diffraction grating to change the wavelength of light reaching the light receiving element.
- the optical spectrum analyzers 12 and 13 are not limited to monochromators.
- an optical signal is divided into a plurality of optical signals by an optical splitter, and each of the divided optical signals corresponds to each signal wavelength.
- the signal processing may be performed by receiving light with a light receiver through a band-pass filter having a central transmission wavelength.
- the optical spectrum analyzers 12 and 13 associate, as information on the analysis result of the wavelength component of the optical signal, for example, the physical quantity (wave number, frequency, etc.) proportional to the wavelength of the optical signal or its energy and the intensity of the optical signal. May be output to the signal processing device 14.
- the signal processing device 14 includes prescribed values of the wavelengths of the downstream optical signals S D1 , S D2 , S D3 , and S D4 , and prescribed values of the wavelengths of the upstream optical signals S U1 , S U2 , S U3 , and S U4. Is stored in advance in the storage device, and by comparing the prescribed values of those wavelengths with the information on the wavelength and intensity acquired from the optical spectrum analyzers 12 and 13, the optical subscriber line termination devices 31 to 31 are compared. The presence / absence and intensity of 34 downstream optical signals and upstream optical signals, and the presence / absence and intensity of optical signals having wavelengths other than the prescribed values can be monitored.
- the signal processing device 14 is configured such that any one of the plurality of optical subscriber line termination devices 31 to 34 interferes with the downstream optical signal before transmitting the downstream optical signal to the wavelength division multiplexing network 20. Before the optical signal having the optical signal flows through the wavelength division multiplexing network 20, or before any one of the plurality of optical subscriber line network devices 41 to 48 transmits the upstream optical signal to the wavelength division multiplexing network 20. It is possible to monitor whether or not an optical signal having a wavelength that interferes with the upstream optical signal flows through the wavelength division multiplexing network 20.
- the signal processing device 14 has a wavelength of the downstream optical signal while any one of the plurality of optical subscriber line terminating devices 31 to 34 is transmitting the downstream optical signal to the wavelength division multiplexing network 20. Whether the optical fiber is deviating from the specified value, or when any one of the plurality of optical subscriber line network devices 41 to 48 is transmitting the upstream optical signal to the wavelength division multiplexing network 20, the upstream optical It is possible to monitor whether the wavelength of the signal is deviated from a specified value.
- the OLT control device 30 Information on the wavelength and intensity of the optical signal flowing through the multiplex network 20 is received from the signal processing device 14, and whether or not an optical signal that interferes with the downstream optical signal S D2 or the upstream optical signal S U2 flows through the wavelength multiplex network 20. to decide.
- the OLT control device 30 determines that neither the optical signal that interferes with the downstream optical signal S D2 nor the optical signal that interferes with the upstream optical signal S U2 flows in the wavelength division multiplexing network 20, the optical subscriber line termination device informs that effect. Report to 32.
- the optical subscriber line terminating device 32 Upon receiving such a report, the optical subscriber line terminating device 32 starts transmission of the downstream optical signal S D2 and starts transmission of the upstream optical signal S U2 among the optical subscriber line network devices 41 to 48. The optical signal S U2 is instructed to be transmitted.
- the OLT control device 30 determines that an optical signal that interferes with the downstream optical signal S D2 or an optical signal that interferes with the upstream optical signal S U2 flows in the wavelength division multiplexing network 20, the optical subscriber line termination is notified to that effect. Report to device 32.
- the optical subscriber line terminating device 32 receives such a report, decides not to transmit / receive the optical signal, and alerts the optical subscriber line network devices 41 to 48 to which the upstream optical signal SU2 is to be transmitted. To emit.
- the wavelength monitoring function of the wavelength monitoring system 10 monitors in advance whether there is an interfering optical signal when any one of the plurality of optical subscriber line terminating devices 31 to 34 starts transmission / reception of the optical signal
- the signal processing device 14 determines whether the wavelength of the downstream optical signal S D1 or the upstream optical signal S U1 deviates from the specified value. It is also possible to monitor whether or not. For example, if the wavelength of the downstream optical signal S D1 is deviated from a specified value, the signal processing device 14 reports that fact to the OLT control device 30. In response to such a report, the OLT control device 30 instructs the optical subscriber line terminating device 31 to correct the downstream optical signal S D1 so that the wavelength matches the specified value. In response to such an instruction, the optical subscriber line terminating device 31 corrects the wavelength of the downstream optical signal S D1 so that it matches the specified value.
- the signal processing device 14 reports the fact to the OLT control device 30. Such a report is transmitted from the OLT control device 30 to the optical subscriber line terminating device 31. Upon receiving such a report, the optical subscriber line terminating device 31 corrects the upstream optical signal S U1 so that the wavelength of the upstream optical signal S U1 coincides with the specified value, among the optical subscriber line network devices 41 to 48. Instruct U1 to send.
- the wavelength monitoring function of the wavelength monitoring system 10 is that when any one of the plurality of optical subscriber line terminating devices 31 to 34 transmits / receives an optical signal, the optical signal deviates from the specified value. It can be used to monitor whether or not.
- the wavelength monitoring system 10 interferes with the downstream optical signal monitoring optical spectrum analysis device 12 and the upstream optical signal analysis optical spectrum analysis device 13 provided as separate systems. There is an advantage that it is possible to distinguish whether the optical signal interferes with the downstream optical signal or the upstream optical signal.
- FIG. 2 is a block diagram showing the configuration of the wavelength monitoring system 10 according to this embodiment.
- the wavelength monitoring system 10 according to the present embodiment includes the above-described filters 15 and 16 for shielding the optical spectrum analyzers 12 and 13 from incident light used for backscattering measurement of the wavelength multiplexing network 20, respectively.
- the configuration is made common in the remaining points.
- pulsed light is incident on the optical fiber 21 constituting the wavelength division multiplexing network 20
- a part of the incident light is scattered in the optical fiber 21 due to a phenomenon called Rayleigh scattering and returns to the incident end. This light is called backscattered light and is used for a transmission loss test of the optical fiber 21.
- the wavelength of the incident light used for the backscattering measurement is generally defined by the prescribed values of the wavelengths of the downstream optical signals S D1 , S D2 , S D3 , S D4 and the upstream optical signals S U1 , S U2 , S U3 , S U4 . Since a wavelength different from the specified value is used, there is no possibility of wavelength interference, but since the intensity of incident light is very strong, when the incident light is input to the optical spectrum analyzers 12 and 13, There is a possibility that the optical receiving circuits of the optical spectrum analyzers 12 and 13 may be saturated or the optical components may be damaged. By providing the filters 15 and 16 for shielding the optical spectrum analyzers 12 and 13 from the incident light used for the backscattering measurement, such a problem can be avoided.
- FIG. 3 is a block diagram showing the configuration of the wavelength monitoring system 10 according to the present embodiment.
- the wavelength monitoring system 10 according to the present embodiment includes an optical multiplexer 17 that combines the downstream optical signal and the upstream optical signal extracted by the optical splitter 11, and is replaced with two optical spectrum analyzers 12 and 13.
- the configuration of the optical spectrum analyzer 18 is the same as that of the first embodiment.
- the configuration of the optical spectrum analyzer 18 is the same as that of the optical spectrum analyzers 12 and 13 described above. According to such a configuration, the number of optical spectrum analyzers can be reduced, so that the cost is low.
- FIG. 4 is a block diagram showing the configuration of the wavelength monitoring system 10 according to this embodiment.
- the wavelength monitoring system 10 according to the present embodiment is different from the above-described third embodiment in that it includes a filter 19 for shielding the optical spectrum analyzer 18 from incident light used for backscattering measurement of the wavelength multiplexing network 20.
- the configuration is made common in the remaining points. According to the present embodiment, the number of optical spectrum analyzers can be reduced, so that the cost is low and the optical spectrum analyzer 18 can be protected from incident light used for backscattering measurement.
- SYMBOLS 10 DESCRIPTION OF SYMBOLS 10 ... Wavelength monitoring system 11 ... Optical splitter 12, 13, 18 ... Optical spectrum analyzer 14 ... Signal processor 15, 16 ... Filter 17 ... Optical multiplexer 20 ... Wavelength multiplexing network 21 ... Optical fiber 22 ... Splitter 23 ... Wavelength Multiplexer / demultiplexer 30 ... OLT control devices 31, 32, 33, 34 ... Optical subscriber line termination devices 41, 42, 43, 44, 45, 46, 47, 48 ... Optical subscriber line network devices
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Abstract
Description
波長多重ネットワーク20は、複数の光加入者線終端装置(OLT)31~34と複数の光加入者線ネットワーク装置(ONU)41~48との間で波長分割多重方式により、下り光信号及び上り光信号を時分割多重伝送するPON(TDM/WDM-PON)である。波長多重ネットワーク20は、光ファイバ21を幹線から支線に分岐させる複数のスプリッタ22と、光加入者線終端装置31~34から光加入者線ネットワーク装置41~48へ伝送される波長の異なる複数の下り光信号SD1,SD2,SD3,SD4を合波するとともに、光加入者線ネットワーク装置41~48から光加入者線終端装置31~34へ伝送される波長の異なる複数の上り光信号SU1,SU2,SU3,SU4を分波する波長合分波器23とを備えている。それぞれの光加入者線ネットワーク装置41~48には、全ての下り光信号SD1,SD2,SD3,SD4が入力されるが、光加入者線ネットワーク装置41~48内に設置された光フィルタの動作により、自機宛の下り光信号のみを抽出する。光加入者線ネットワーク装置41~48から光加入者線終端装置31~34への上り光信号SU1,SU2,SU3,SU4は、それぞれ同じ波長を有する上り信号間で、その送信タイミングが互いに重ならないように時分割多重伝送される。OLT制御装置30は、それぞれの光加入者線終端装置31~34による光信号の送受信を制御する。
本実施例に係わる波長監視システム10は、波長多重ネットワーク20の後方散乱測定に用いられる入射光から光スペクトラム解析装置12,13をそれぞれ遮蔽するためのフィルタ15,16を備えている点で上述の実施例1と異なり、その余の点でその構成を共通にする。波長多重ネットワーク20を構成する光ファイバ21にパルス光を入射すると、レイリー散乱という現象により光ファイバ21内で入射光の一部が散乱されて入射端に戻ってくる。この光は、後方散乱光と呼ばれており、光ファイバ21の伝送損失試験に利用される。後方散乱測定に用いられる入射光の波長は、一般に、下り光信号SD1,SD2,SD3,SD4の波長の規定値、及び上り光信号SU1,SU2,SU3,SU4の波長の規定値とは異なるものが使用されているため、波長干渉の虞はないが、入射光の強度は非常に強いため、その入射光が光スペクトラム解析装置12,13に入力されると、光スペクトラム解析装置12,13の光受信回路が飽和したり、或いはその光部品の損傷等を招いたりする虞がある。後方散乱測定に用いられる入射光から光スペクトラム解析装置12,13をそれぞれ遮蔽するためのフィルタ15,16を設けることにより、そのような不具合を回避できる。
本実施例に係わる波長監視システム10は、光分岐器11によって抽出された下り光信号及び上り光信号を合波する光合波器17を備える点、及び二つの光スペクトラム解析装置12,13に替えて一つの光スペクトラム解析装置18を備える点で上述の実施例1と異なり、その余の点でその構成を共通にする。但し、光スペクトラム解析装置18の構成は、上述の光スペクトラム解析装置12,13の構成と同じである。斯かる構成によれば、光スペクトラム解析装置の個数を削減できるため、低コストである。
本実施例に係わる波長監視システム10は、波長多重ネットワーク20の後方散乱測定に用いられる入射光から光スペクトラム解析装置18を遮蔽するためのフィルタ19を備えている点で上述の実施例3と異なり、その余の点でその構成を共通にする。本実施例によれば、光スペクトラム解析装置の個数を削減できるため、低コストである上に、後方散乱測定用いられる入射光から光スペクトラム解析装置18を保護することができる。
11…光分岐器
12,13,18…光スペクトラム解析装置
14…信号処理装置
15,16…フィルタ
17…光合波器
20…波長多重ネットワーク
21…光ファイバ
22…スプリッタ
23…波長合分波器
30…OLT制御装置
31,32,33,34…光加入者線終端装置
41,42,43,44,45,46,47,48…光加入者線ネットワーク装置
Claims (13)
- 波長多重ネットワークに流れる光信号の一部を抽出する光分岐器と、
前記抽出された光信号の波長を分析する光スペクトラム解析装置と、
を備える波長監視システム。 - 請求項1に記載の波長監視システムであって、
前記波長多重ネットワークの後方散乱測定に用いられる入射光から前記光スペクトラム解析装置を遮蔽するためのフィルタを更に備える、波長監視システム。 - 複数の光加入者線終端装置と複数の光加入者線ネットワーク装置との間で波長分割多重方式により下り光信号及び上り光信号を伝送する波長多重ネットワークから前記下り光信号の一部及び前記上り光信号の一部を抽出する光分岐器と、
前記抽出された下り光信号の波長を分析する第1の光スペクトラム解析装置と、
前記抽出された上り光信号の波長を分析する第2の光スペクトラム解析装置と、
を備える波長監視システム。 - 請求項3に記載の波長監視システムであって、
前記波長多重ネットワークの後方散乱測定に用いられる入射光から前記第1の光スペクトラム解析装置を遮蔽するための第1のフィルタと、
前記波長多重ネットワークの後方散乱測定に用いられる入射光から前記第2の光スペクトラム解析装置を遮蔽するための第2のフィルタと、
を更に備える、波長監視システム。 - 請求項3に記載の波長監視システムであって、
前記第1の光スペクトル解析装置から前記下り光信号の波長及び強度に関する情報を受信するとともに、前記第2の光スペクトル解析装置から前記上り光信号の波長及び強度に関する情報を受信する信号処理装置を更に備える、波長監視システム。 - 請求項5に記載の波長監視システムであって、
前記信号処理装置は、前記複数の光加入者線終端装置のうち何れか一つがその下り光信号を前記波長多重ネットワークに送信する前にその下り光信号に干渉する波長を有する光信号が前記波長多重ネットワークを流れているか否かを監視し、或いは前記複数の光加入者線ネットワーク装置のうち何れか一つがその上り光信号を前記波長多重ネットワークに送信する前にその上り光信号に干渉する波長を有する光信号が前記波長多重ネットワークを流れているか否かを監視する、波長監視システム。 - 請求項5に記載の波長監視システムであって、
前記信号処理装置は、前記複数の光加入者線終端装置のうち何れか一つがその下り光信号を前記波長多重ネットワークに送信している最中にその下り光信号の波長が規定値からずれているか否かを監視し、或いは前記複数の光加入者線ネットワーク装置のうち何れか一つがその上り光信号を前記波長多重ネットワークに送信している最中にその上り光信号の波長が規定値からずれているか否かを監視する、波長監視システム。 - 複数の光加入者線終端装置と複数の光加入者線ネットワーク装置との間で波長分割多重方式により下り光信号及び上り光信号を伝送する波長多重ネットワークから前記下り光信号の一部及び前記上り光信号の一部を抽出する光分岐器と、
前記抽出された下り光信号及び上り光信号を合波する光合波器と、
前記合波された下り光信号及び上り光信号の波長を分析する光スペクトラム解析装置と、
を備える波長監視システム。 - 請求項8に記載の波長監視システムであって、
前記波長多重ネットワークの後方散乱測定に用いられる入射光から前記光スペクトラム解析装置を遮蔽するためのフィルタを更に備える、波長監視システム。 - 請求項8に記載の波長監視システムであって、
前記光スペクトル解析装置から前記下り光信号の波長及び強度に関する情報と前記上り光信号の波長及び強度に関する情報を受信する信号処理装置を更に備える、波長監視システム。 - 請求項10に記載の波長監視システムであって、
前記信号処理装置は、前記複数の光加入者線終端装置のうち何れか一つがその下り光信号を前記波長多重ネットワークに送信する前にその下り光信号に干渉する波長を有する光信号が前記波長多重ネットワークを流れているか否かを監視し、或いは前記複数の光加入者線ネットワーク装置のうち何れか一つがその上り光信号を前記波長多重ネットワークに送信する前にその上り光信号に干渉する波長を有する光信号が前記波長多重ネットワークを流れているか否かを監視する、波長監視システム。 - 請求項10に記載の波長監視システムであって、
前記信号処理装置は、前記複数の光加入者線終端装置のうち何れか一つがその下り光信号を前記波長多重ネットワークに送信している最中にその下り光信号の波長が規定値からずれているか否かを監視し、或いは前記複数の光加入者線ネットワーク装置のうち何れか一つがその上り光信号を前記波長多重ネットワークに送信している最中にその上り光信号の波長が規定値からずれているか否かを監視する、波長監視システム。 - 波長多重ネットワークから光信号の一部を抽出し、
前記抽出された光信号の波長を分析する、波長監視方法。
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