JP5657474B2 - Optical signal type identifier - Google Patents

Optical signal type identifier Download PDF

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JP5657474B2
JP5657474B2 JP2011124965A JP2011124965A JP5657474B2 JP 5657474 B2 JP5657474 B2 JP 5657474B2 JP 2011124965 A JP2011124965 A JP 2011124965A JP 2011124965 A JP2011124965 A JP 2011124965A JP 5657474 B2 JP5657474 B2 JP 5657474B2
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JP2012253590A (en
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剛志 関
剛志 関
福太郎 濱岡
福太郎 濱岡
松田　俊哉
俊哉 松田
明 那賀
明 那賀
織田　一弘
一弘 織田
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Nippon Telegraph and Telephone Corp
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Description

本発明は、入力する光信号の波長、波長数、代表波長の変調速度（変調周波数）を検出し、例えば当該光信号を接続する接続ポートなどの特定に用いる光信号種別を識別する光信号種別識別器に関する。   The present invention detects the wavelength, the number of wavelengths, and the modulation speed (modulation frequency) of a representative wavelength of an input optical signal, and identifies, for example, an optical signal type used for specifying a connection port for connecting the optical signal. It relates to a classifier.

光ネットワークシステムでは、クライアントからの光信号を光ネットワークに挿入（Ａｄｄ）し、光ネットワークからの光信号をクライアントへ出力（Ｄｒｏｐ）する機能を有する装置を光クロスコネクト（ＯＸＣ）と呼んでいる。そのＯＸＣは、合分波器、光スイッチ、波長選択スイッチなどとともに構成することが知られている（特許文献１）。   In the optical network system, a device having a function of inserting (Add) an optical signal from a client into the optical network and outputting (Drop) the optical signal from the optical network to the client is called an optical cross connect (OXC). It is known that the OXC is configured with a multiplexer / demultiplexer, an optical switch, a wavelength selective switch, and the like (Patent Document 1).

また、ＷＤＭ伝送装置には、各クライアントに対応する光信号の経路切替や多重、逆多重を実施する端局装置が接続される。近年、ＷＤＭ伝送装置と端局装置との間のトランスポンダ削減やオペレーションコスト削減のために、図６に示すようなＯＸＣとＯＤＵ−ＸＣの機能を統合したノード装置が提案されている。   The WDM transmission apparatus is connected to a terminal station apparatus that performs optical signal path switching, multiplexing, and demultiplexing corresponding to each client. In recent years, a node device that integrates the functions of OXC and ODU-XC as shown in FIG. 6 has been proposed in order to reduce the transponder between the WDM transmission device and the terminal device and to reduce the operation cost.

図６において、ノード装置は、ＷＤＭ伝送路に接続され、波長単位に経路切替を行うＯＸＣと、ＩＦ部３１，３２を介してユーザＩＦのアドドロップポートとＯＸＣのアドドロップポートとの間で所定の信号処理を行う高速トランスポンダ３３，３４と、電気信号の経路切替を行うＯＤＵ−ＸＣと、ＩＦ部３１，３２を介してユーザＩＦのアドドロップポートとＯＤＵ−ＸＣのアドドロップポートとの間で光／電気変換、電気／光変換を行う低速トランスポンダ３５，３６と、ＯＸＣとＯＤＵ−ＸＣとの間で多重／分離を行うトランスポンダ３７，３８とを備える。ＯＤＵ−ＸＣおよび各トランスポンダは、ＯＸＣのユーザＩＦ部に接続される端局装置の機能を有する。   In FIG. 6, a node device is connected to a WDM transmission line and switches between OXCs that perform path switching in units of wavelengths, and a user IF add-drop port and an OXC add-drop port via IF units 31 and 32. Between the high-speed transponders 33 and 34 for performing the signal processing, the ODU-XC for switching the path of the electric signal, and the add-drop port for the user IF and the add-drop port for the ODU-XC via the IF units 31 and 32. Low-speed transponders 35 and 36 that perform optical / electrical conversion and electrical / optical conversion, and transponders 37 and 38 that perform multiplexing / separation between OXC and ODU-XC are provided. The ODU-XC and each transponder have a function of a terminal device connected to the user IF unit of the OXC.

特開２００８−２５２６６４号公報JP 2008-252664 A

クライアントが使用するサービスの多様化により、要求信号帯域が様々になっている。例えば、10Ｇbit/s の信号を１波長の光信号で伝送する形態や、 100Ｇbit/s の信号を25Ｇbit/s ずつ４波長の光信号で伝送する形態がある。   Due to the diversification of services used by clients, request signal bandwidths have been varied. For example, there are a form in which a 10 Gbit / s signal is transmitted as an optical signal of one wavelength, and a form of a 100 Gbit / s signal transmitted as 25 Gbit / s in four wavelengths.

このように信号を伝送するクライアントのニーズに応じて、利用目的に応じたトラフィックに適合した光信号種別が選択され、ネットワーク内の帯域利用、伝送コストの最適化が図られている。そのためには、図６に示すノード装置のＩＦ部３１，３２において、入出力する光信号の光信号種別を識別し、対応する接続ポートなどを特定した光ファイバ接続作業が必要になっている。しかし、光ファイバ接続作業は保守者による現地作業が必要であり、光信号種別の確認等は事前準備している設計書や接続元の現地作業者との口頭伝達によることから、光信号種別に応じてノード装置の接続ポートが異なる場合、保守者の誤接続による信頼性低下や作業時間の増大が課題になっている。   In this way, according to the needs of the client transmitting the signal, the optical signal type suitable for the traffic according to the purpose of use is selected, and the band use in the network and the transmission cost are optimized. For this purpose, it is necessary to perform an optical fiber connection operation by identifying the optical signal type of the input / output optical signal and specifying the corresponding connection port in the IF units 31 and 32 of the node device shown in FIG. However, optical fiber connection work requires field work by maintenance personnel, and confirmation of the optical signal type, etc. is based on a prepared design document and verbal communication with the local worker of the connection source. Accordingly, when the connection ports of the node devices are different, there are problems such as a decrease in reliability and an increase in work time due to erroneous connection by a maintenance person.

本発明は、光信号の波長、波長数、変調速度（変調周波数）を検出して光信号種別を識別することができる光信号種別識別器を提供することを目的とする。   An object of the present invention is to provide an optical signal type discriminator capable of identifying the optical signal type by detecting the wavelength, the number of wavelengths, and the modulation speed (modulation frequency) of the optical signal.

本発明の光信号種別識別器は、少なくとも１つの波長で所定の変調速度で変調された光信号を入力し、当該光信号の波長および波長数を検出する光波長モニタと、光信号を入力し、光波長モニタで検出された波長のうちの代表波長の光信号を分波して電気信号に変換し、電圧制御発振器の出力との周波数／位相誤差が最小となる周波数を、光信号の１波長あたりの変調速度として検出する変調速度モニタと、光波長モニタで検出された光信号の波長および波長数の情報と、変調速度モニタで検出された光信号の１波長あたりの変調速度の情報を入力し、事前登録しているデータベースを参照して光信号の要求信号帯域を示す光信号種別を識別する光信号種別識別部とを備える。
The optical signal type discriminator of the present invention inputs an optical signal modulated at a predetermined modulation speed with at least one wavelength, inputs an optical wavelength monitor for detecting the wavelength and the number of wavelengths of the optical signal, and an optical signal. The optical signal of the representative wavelength of the wavelengths detected by the optical wavelength monitor is demultiplexed and converted into an electrical signal, and the frequency at which the frequency / phase error with the output of the voltage controlled oscillator is minimized is set to 1 of the optical signal . a modulation rate monitor to detect a modulation rate per wavelength, and the wavelength and the wavelength number information of the detected optical signal by the optical wavelength monitor, the information modulation rate per one wavelength of the detected optical signal at a modulation rate monitor And an optical signal type identifying unit that identifies an optical signal type indicating a requested signal bandwidth of the optical signal with reference to a database that is input and registered in advance.

本発明の光信号種別識別器における光波長モニタは、光スペクトラムアナライザを用いて光信号の波長および波長数を検出し、その情報を光信号種別識別部に通知するとともに、代表波長の情報を変調速度モニタに通知する構成としてもよい。   The optical wavelength monitor in the optical signal type discriminator of the present invention detects the wavelength and the number of wavelengths of an optical signal using an optical spectrum analyzer, notifies the information to the optical signal type discriminator, and modulates information on the representative wavelength. The speed monitor may be notified.

本発明の光信号種別識別器における光波長モニタは、光信号を各波長の出力ポートに分波する波長分波器と、各波長の出力ポートにそれぞれ接続される光パワーモニタとを備え、各波長に対応する光パワーモニタの出力値が所定値を超える波長とその波長数を検出し、その情報を光信号種別識別部に通知するとともに、代表波長の情報を変調速度モニタに通知する構成としてもよい。   The optical wavelength monitor in the optical signal type discriminator of the present invention comprises a wavelength demultiplexer for demultiplexing an optical signal to each wavelength output port, and an optical power monitor connected to each wavelength output port, A configuration in which the output value of the optical power monitor corresponding to the wavelength exceeds the predetermined value and the number of wavelengths is detected, the information is notified to the optical signal type identification unit, and the information on the representative wavelength is notified to the modulation rate monitor. Also good.

本発明の光信号種別識別器は、さまざまなクライアントに対応する入力光信号の波長、波長数、１波あたりの変調速度を検出し、事前登録の情報と比較することにより当該入力光信号の光信号種別を識別することができる。また、この光信号種別識別器をさまざまなクライアントの光信号を収容するノード装置に用いることにより、光伝送システム導入時やクライアントのサービスアップグレード時の作業を効率化することができる。また、現地保守者の作業を軽減し、コスト削減および作業時間の短縮が可能になる。   The optical signal type discriminator of the present invention detects the wavelength, the number of wavelengths, and the modulation speed per wave of an input optical signal corresponding to various clients, and compares it with information of pre-registration to detect the light of the input optical signal. The signal type can be identified. In addition, by using this optical signal type discriminator for a node device that accommodates optical signals of various clients, it is possible to improve the efficiency of work when introducing an optical transmission system or upgrading a client service. Moreover, the work of the local maintenance personnel can be reduced, and the cost can be reduced and the working time can be shortened.

本発明の光信号種別識別器の構成例を示す図である。It is a figure which shows the structural example of the optical signal classification discriminator of this invention. 光波長モニタ１２の構成例を示す図である。3 is a diagram illustrating a configuration example of an optical wavelength monitor 12. FIG. 変調速度モニタ１３の構成例を示す図である。3 is a diagram illustrating a configuration example of a modulation rate monitor 13. FIG. 本発明の光信号種別識別器の処理手順を示す図である。It is a figure which shows the process sequence of the optical signal classification discriminator of this invention. 光信号種別識別部１４のデータベースの登録例を示す図である。It is a figure which shows the example of registration of the database of the optical signal classification identification part. 本発明の光信号種別識別器が用いられるノード装置の構成例を示す図である。It is a figure which shows the structural example of the node apparatus by which the optical signal classification discriminator of this invention is used.

図１は、本発明の光信号種別識別器の構成例を示す。
図１において、光信号種別識別器は、光カプラ１１、光波長モニタ１２、変調速度モニタ１３および光信号種別識別部１４により構成される。なお、本発明の光信号種別識別器は、例えば図６に示すノード装置のＩＦ部３１，３２に接続し、入出力する光信号の光信号種別の識別に用いられる。また、ＩＦ部３１，３２に代えて光スイッチが用いられる構成では、この光スイッチに接続される。 FIG. 1 shows a configuration example of an optical signal type discriminator according to the present invention.
In FIG. 1, the optical signal type identifier includes an optical coupler 11, an optical wavelength monitor 12, a modulation speed monitor 13, and an optical signal type identification unit 14. The optical signal type discriminator of the present invention is connected to the IF units 31 and 32 of the node device shown in FIG. 6, for example, and is used for discriminating the optical signal type of the optical signal to be input / output. Further, in a configuration in which an optical switch is used in place of the IF units 31 and 32, the optical switch is connected.

入力する光信号は光カプラ１１で分岐され、一方が光波長モニタ１２に入力し、他方が変調速度モニタ１３に入力する。光波長モニタ１２は、光信号の波長および波長数を検出して光信号種別識別部１４に通知するとともに、その代表波長を変調速度モニタ１３に通知する。例えば、10Ｇbit/s の信号を１波長の光信号で伝送する形態では、当該１波長と波長数１が検出され、その１波長が代表波長となる。 100Ｇbit/s の信号を25Ｇbit/s ずつ４波長の光信号で伝送する形態では、当該４波長と波長数４が検出され、その１波長が代表波長となる。変調速度モニタ１３は、光波長モニタ１２から通知された代表波長の光信号から１波長あたりの変調速度（変調周波数）を検出する。光信号種別識別部１４は、光波長モニタ１２で検出された入力光信号の波長および波長数の情報と、変調速度モニタ１３で検出された１波長あたりの変調速度の情報を入力し、事前登録しているデータベースを参照して入力光信号の光信号種別を識別する。   The input optical signal is branched by the optical coupler 11, one of which is input to the optical wavelength monitor 12 and the other is input to the modulation rate monitor 13. The optical wavelength monitor 12 detects the wavelength and the number of wavelengths of the optical signal and notifies the optical signal type identification unit 14 and notifies the modulation speed monitor 13 of the representative wavelength. For example, in a mode in which a 10 Gbit / s signal is transmitted as an optical signal of one wavelength, the one wavelength and the number of wavelengths 1 are detected, and the one wavelength becomes the representative wavelength. In a mode in which a 100 Gbit / s signal is transmitted as an optical signal of 4 wavelengths at 25 Gbit / s, the 4 wavelengths and the number of wavelengths 4 are detected, and one wavelength becomes the representative wavelength. The modulation speed monitor 13 detects the modulation speed (modulation frequency) per wavelength from the optical signal of the representative wavelength notified from the optical wavelength monitor 12. The optical signal type identification unit 14 inputs the information of the wavelength and the number of wavelengths of the input optical signal detected by the optical wavelength monitor 12 and the information of the modulation speed per wavelength detected by the modulation speed monitor 13 and registers in advance. The type of the optical signal of the input optical signal is identified with reference to the database.

図２は、光波長モニタ１２の構成例を示す。
図２(1) は、光波長モニタ１２として光スペクトラムアナライザを用いる例であり、波長をスイープすることにより、ピーク波長や波長数を検出する。 FIG. 2 shows a configuration example of the optical wavelength monitor 12.
FIG. 2A shows an example in which an optical spectrum analyzer is used as the optical wavelength monitor 12, and the peak wavelength and the number of wavelengths are detected by sweeping the wavelength.

図２(2) は、波長分波器１２１の各波長に対応する出力ポートにそれぞれ光パワーモニタ１２２を接続した構成であり、各波長に対応する光パワーモニタ１２２の出力値が閾値を超える波長とその波長数を検出する。   FIG. 2 (2) shows a configuration in which an optical power monitor 122 is connected to each output port corresponding to each wavelength of the wavelength demultiplexer 121, and the output value of the optical power monitor 122 corresponding to each wavelength exceeds the threshold value. And the number of wavelengths is detected.

図３は、変調速度モニタ１３の構成例を示す。
図３において、変調速度モニタ１３は波長可変フィルタ１３１および変調信号モニタ１３２により構成される。波長可変フィルタ１３１は、光波長モニタ１２から通知された代表波長を透過帯域として設定し、入力する光信号から代表波長の光信号を分波して出力する。変調信号モニタ１３２は、波長可変フィルタ１３１を透過した代表波長の光信号を入力し、光／電気変換器（Ｏ／Ｅ）１３３で電気信号に変換する。この電気信号は、位相比較器１３４で電圧制御発振器（ＶＣＯ）１３６の出力と周波数／位相比較され、その周波数／位相誤差信号が制御器１３５に入力される。制御器１３５は、周波数／位相誤差信号が最小になるようにＶＣＯ１３６の周波数／位相を制御する。これを繰り返し、周波数／位相誤差信号が最小になったときのＶＣＯ１３６の周波数を、入力する光信号の１波長あたりの変調速度（変調周波数）として出力する。 FIG. 3 shows a configuration example of the modulation rate monitor 13.
In FIG. 3, the modulation speed monitor 13 includes a wavelength variable filter 131 and a modulation signal monitor 132. The wavelength tunable filter 131 sets the representative wavelength notified from the optical wavelength monitor 12 as a transmission band, demultiplexes the optical signal of the representative wavelength from the input optical signal, and outputs the demultiplexed optical signal. The modulation signal monitor 132 receives an optical signal having a representative wavelength that has passed through the wavelength tunable filter 131, and converts the optical signal into an electric signal by an optical / electrical converter (O / E) 133. This electric signal is frequency / phase-compared with the output of the voltage controlled oscillator (VCO) 136 by the phase comparator 134, and the frequency / phase error signal is input to the controller 135. The controller 135 controls the frequency / phase of the VCO 136 so that the frequency / phase error signal is minimized. This is repeated, and the frequency of the VCO 136 when the frequency / phase error signal is minimized is output as the modulation speed (modulation frequency) per wavelength of the input optical signal.

図４は、本発明の光信号種別識別器の処理手順を示す。
図４において、(1) 光波長モニタ１２は、入力光信号の波長および波長数を検出する。(2) 光波長モニタ１２は、検出した波長数が１が場合は当該波長を代表波長として、複数の場合はそのうちの１波長を代表波長として、その情報を変調速度モニタ１３に通知する。(3) 変調速度モニタ１３は、代表波長の情報を受領する。(4) 光波長モニタ１２は、検出した波長および波長数の情報を光信号種別識別部１４に通知する。(5) 光信号種別識別部１４は、波長および波長数の情報を受領する。 FIG. 4 shows a processing procedure of the optical signal type discriminator of the present invention.
In FIG. 4, (1) the optical wavelength monitor 12 detects the wavelength and the number of wavelengths of the input optical signal. (2) The optical wavelength monitor 12 notifies the modulation speed monitor 13 of the information when the detected number of wavelengths is 1, with the wavelength as a representative wavelength, and when there are a plurality of wavelengths, one of the wavelengths is the representative wavelength. (3) The modulation rate monitor 13 receives information on the representative wavelength. (4) The optical wavelength monitor 12 notifies the optical signal type identification unit 14 of information on the detected wavelength and the number of wavelengths. (5) The optical signal type identification unit 14 receives information on the wavelength and the number of wavelengths.

(6) 変調速度モニタ１３は、光波長モニタ１２から通知された代表波長を透過波長に設定し、入力光信号の１波長あたりの変調速度を検出する。(7) 変調速度モニタ１３は、検出した代表波長の変調速度の情報を光信号種別識別部１４に通知する。(8) 光信号種別識別部１４は、当該１波長あたりの変調速度の情報を受領する。(9) 光信号種別識別部１４は、受領した入力光信号の波長、波長数、１波長あたりの変調速度と、データベースに登録されている情報とを照合し、対応する光信号種別を識別する。   (6) The modulation rate monitor 13 sets the representative wavelength notified from the optical wavelength monitor 12 as the transmission wavelength, and detects the modulation rate per wavelength of the input optical signal. (7) The modulation rate monitor 13 notifies the optical signal type identification unit 14 of information on the detected modulation rate of the representative wavelength. (8) The optical signal type identification unit 14 receives information on the modulation speed per wavelength. (9) The optical signal type identification unit 14 collates the wavelength, the number of wavelengths, the modulation speed per wavelength of the received input optical signal, and the information registered in the database, and identifies the corresponding optical signal type. .

図５は、光信号種別識別部１４のデータベースの登録例を示す。
図５において、波長数、代表波長、１波長あたりの変調速度と光信号種別が対応付けられている。ただし、波長や変調速度の情報のみで規格化されているクライアント対応の光信号種別のすべてを識別することができないが、実際に装置に収容する可能性のある情報のみ光信号種別識別部１４に登録しておくことで、運用に支障ない識別が可能である。 FIG. 5 shows a registration example of the database of the optical signal type identification unit 14.
In FIG. 5, the number of wavelengths, the representative wavelength, the modulation speed per wavelength, and the optical signal type are associated with each other. However, it is impossible to identify all of the optical signal types corresponding to clients that are standardized only by information on the wavelength and modulation speed, but only the information that may be actually accommodated in the apparatus is stored in the optical signal type identification unit 14. By registering, it is possible to identify without any problem.

例えば、波長 1.5μｍ、波長数１、１波長あたりの変調速度が10.3125 Ｇbit/s であれば、上記の10Ｇbit/s の信号を１波長の光信号で伝送するクライアントの光信号として識別することができる。また、波長 1.3μｍ、波長数４、１波長あたりの変調速度が25.78125Ｇbit/s であれば、上記の 100Ｇbit/s の信号を25Ｇbit/s ずつ４波長の光信号で伝送するクライアントの光信号として識別することができる。   For example, if the wavelength is 1.5 μm, the number of wavelengths is 1, and the modulation speed per wavelength is 10.3125 Gbit / s, the above 10 Gbit / s signal can be identified as an optical signal of a client that transmits an optical signal of one wavelength. it can. If the wavelength is 1.3 μm, the number of wavelengths is 4, and the modulation speed per wavelength is 25.78125 Gbit / s, the above 100 Gbit / s signal is transmitted as 25 Gbit / s by 4 wavelengths. Can be identified.

１１ 光カプラ
１２ 光波長モニタ
１２１ 波長分波器
１２２ 光パワーモニタ
１３ 変調速度モニタ
１３１ 波長可変フィルタ
１３２ 変調信号モニタ
１３３ 光／電気変換器（Ｏ／Ｅ）
１３４ 位相比較器
１３５ 制御器
１３６ 電圧制御発振器（ＶＣＯ）
１４ 光信号種別識別部 DESCRIPTION OF SYMBOLS 11 Optical coupler 12 Optical wavelength monitor 121 Wavelength demultiplexer 122 Optical power monitor 13 Modulation speed monitor 131 Wavelength variable filter 132 Modulation signal monitor 133 Optical / electrical converter (O / E)
134 Phase comparator 135 Controller 136 Voltage controlled oscillator (VCO)
14 Optical signal type identification unit

Claims (3)

少なくとも１つの波長で所定の変調速度で変調された光信号を入力し、当該光信号の波長および波長数を検出する光波長モニタと、
前記光信号を入力し、前記光波長モニタで検出された波長のうちの代表波長の光信号を分波して電気信号に変換し、電圧制御発振器の出力との周波数／位相誤差が最小となる周波数を、前記光信号の１波長あたりの変調速度として検出する変調速度モニタと、
前記光波長モニタで検出された前記光信号の波長および波長数の情報と、前記変調速度モニタで検出された前記光信号の１波長あたりの変調速度の情報を入力し、事前登録しているデータベースを参照して前記光信号の要求信号帯域を示す光信号種別を識別する光信号種別識別部と
を備えたことを特徴とする光信号種別識別器。 An optical wavelength monitor that inputs an optical signal modulated at a predetermined modulation speed with at least one wavelength and detects the wavelength and the number of wavelengths of the optical signal;
The optical signal is input, an optical signal having a representative wavelength out of the wavelengths detected by the optical wavelength monitor is demultiplexed and converted into an electrical signal, and the frequency / phase error with the output of the voltage controlled oscillator is minimized. a modulation rate monitor to detect the frequency as the modulation rate per one wavelength of the optical signal,
Database pre-registered by inputting information on the wavelength and number of wavelengths of the optical signal detected by the optical wavelength monitor and information on the modulation speed per wavelength of the optical signal detected by the modulation speed monitor An optical signal type discriminator comprising: an optical signal type discriminating unit for discriminating an optical signal type indicating a request signal band of the optical signal with reference to FIG. 請求項１に記載の光信号種別識別器において、
前記光波長モニタは、光スペクトラムアナライザを用いて前記光信号の波長および波長数を検出し、その情報を前記光信号種別識別部に通知するとともに、前記代表波長の情報を前記変調速度モニタに通知する構成である
ことを特徴とする光信号種別識別器。 In the optical signal type discriminator according to claim 1,
The optical wavelength monitor detects the wavelength and the number of wavelengths of the optical signal using an optical spectrum analyzer, notifies the information to the optical signal type identification unit, and notifies the modulation speed monitor of the information on the representative wavelength. An optical signal type discriminator characterized by comprising: 請求項１に記載の光信号種別識別器において、
前記光波長モニタは、前記光信号を各波長の出力ポートに分波する波長分波器と、各波長の出力ポートにそれぞれ接続される光パワーモニタとを備え、各波長に対応する光パワーモニタの出力値が所定値を超える波長とその波長数を検出し、その情報を前記光信号種別識別部に通知するとともに、前記代表波長の情報を前記変調速度モニタに通知する構成である
ことを特徴とする光信号種別識別器。 In the optical signal type discriminator according to claim 1,
The optical wavelength monitor includes a wavelength demultiplexer for demultiplexing the optical signal to an output port for each wavelength, and an optical power monitor connected to the output port for each wavelength, and an optical power monitor corresponding to each wavelength. The wavelength and the number of wavelengths exceeding the predetermined value are detected, the information is notified to the optical signal type identification unit, and the information on the representative wavelength is notified to the modulation rate monitor. An optical signal type discriminator.
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