JPH05235902A - Receiver for optical wavelength division multiplex system - Google Patents
Receiver for optical wavelength division multiplex systemInfo
- Publication number
- JPH05235902A JPH05235902A JP4032037A JP3203792A JPH05235902A JP H05235902 A JPH05235902 A JP H05235902A JP 4032037 A JP4032037 A JP 4032037A JP 3203792 A JP3203792 A JP 3203792A JP H05235902 A JPH05235902 A JP H05235902A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- signal
- receiver
- receiving
- wavelength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 113
- 239000013307 optical fiber Substances 0.000 claims abstract description 17
- 238000005086 pumping Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000004936 stimulating effect Effects 0.000 abstract 2
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光通信分野における光
波長分割多重方式の受信装置に関し、特に光ファイバ増
幅を光プリアンプとして用いた光波長分割多重方式の受
信装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical wavelength division multiplexing receiver in the field of optical communications, and more particularly to an optical wavelength division multiplexing receiver using optical fiber amplification as an optical preamplifier.
【０００２】[0002]
【従来の技術】従来の光受信装置は光ファイバ増幅器を
光受信盤の前段に設け、光プリアンプとして使用する場
合、光ファイバ増幅器の出力制御としては、一般的には
利得一定制御を行っていた。2. Description of the Related Art In a conventional optical receiving apparatus, an optical fiber amplifier is provided in the front stage of an optical receiving board, and when it is used as an optical preamplifier, the output control of the optical fiber amplifier is generally a constant gain control. ..
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
光ファイバ増幅器の場合利得一定制御あるいは出力一定
制御が一般的であるため、光ファイバ増幅器と光受信盤
との間に、光のフィルタが挿入されている構成ではフィ
ルタの帯域が狭いため光スペクトラム変動や光学部品の
損失変動が要因で光受信盤の光入力レベルが変化するお
それがある。この変化で光受信レベルが光受信盤の許容
外の値となり、誤りを生じるような問題点があった。
又、波長多重された光信号より、波長選択した場合、光
受信盤の特性バラツキの影響が大きく、光受信盤の最適
化が困難であった。However, in the case of the conventional optical fiber amplifier, since the constant gain control or the constant output control is general, an optical filter is inserted between the optical fiber amplifier and the optical receiver. In this configuration, since the band of the filter is narrow, the optical input level of the optical receiver may change due to the optical spectrum variation and the loss variation of the optical components. Due to this change, the optical receiving level becomes a value outside the allowable range of the optical receiving board, and there is a problem that an error occurs.
Moreover, when wavelengths are selected from the wavelength-multiplexed optical signals, the characteristic variations of the optical receiver are large, making it difficult to optimize the optical receiver.
【０００４】そこで、本発明の技術的課題は上記欠点に
鑑み光波長分割多重された光信号入力を受ける受信部に
おいて、個々の光受信盤の光入力レベルを一定に制御し
て個々の光受信盤の最適化を図る光波長分割多重方式の
受信装置を提供することである。In view of the above-mentioned drawbacks, the technical problem of the present invention is that, in the receiving section for receiving the optical signal input by the optical wavelength division multiplexing, the optical input level of each optical receiving board is controlled to be constant and the individual optical receiving is performed. An object of the present invention is to provide an optical wavelength division multiplexing receiver that optimizes the board.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、波長分
割多重方式で伝送された光信号を受けて増幅する光ファ
イバ増幅器と、増幅された光信号から所定の波長成分を
選択し、選択された選択光信号を受ける光受信盤と含む
複数の光受信ユニットを有する光波長分割多重方式の受
信装置において、前記複数の光受信ユニットは、前記光
受信盤に入力される選択光信号のレベルをモニタするモ
ニタ手段と、該モニタされたレベルに基づいて、前記光
ファイバ増幅器の利得を制御する利得制御手段とを夫々
有することを特徴とする光波長分割多重方式の受信装置
が得られる。According to the present invention, an optical fiber amplifier for receiving and amplifying an optical signal transmitted by a wavelength division multiplexing system, and a predetermined wavelength component is selected from the amplified optical signal and selected. In a receiver of an optical wavelength division multiplexing system having a plurality of optical receiving units including an optical receiving board for receiving selected optical signals, the plurality of optical receiving units have levels of selected optical signals input to the optical receiving board. And a gain control means for controlling the gain of the optical fiber amplifier on the basis of the monitored level.
【０００６】また、本発明によれば、主信号波長成分を
含む波長多重された光入力信号を複数の方向に分岐する
メイン分岐手段と、前記複数に分岐された光分岐信号を
受ける複数の光受信ユニットとを有する光波長分割多重
方式の受信装置において、前記複数の光受信ユニット
は、前記光分岐信号を受けて増幅して増幅信号を出力す
るプリアンプ手段と、該プリアンプ手段に、励起光を供
給する励起光源と、該励起光源を駆動する励起光源駆動
手段と、前記増幅信号から、前記主信号波長成分を抽出
するフィルタ手段と、前記抽出された主信号波長成分を
第１および第２の方向に分岐するサブ分岐手段と、前記
第１の方向分岐された主信号波長成分を受ける光受信盤
と、前記第２の方向に分岐された主信号波長成分を受
け、光・電気変換して出力電気信号を生成する変換手段
と、前記出力電気信号に基づいて、前記プリアンプ手段
の出力を一定にするように、前記励起光源駆動手段を制
御する利得制御手段とを夫々有することを特徴とする光
波長分割多重方式の受信装置が得られる。Further, according to the present invention, main branching means for branching the wavelength-multiplexed optical input signal containing the main signal wavelength component into a plurality of directions, and a plurality of optical signals for receiving the plurality of optical branch signals. In a receiver of an optical wavelength division multiplexing system having a receiving unit, the plurality of optical receiving units include preamplifier means for receiving and amplifying the optical branch signals and outputting amplified signals, and pumping light to the preamplifier means. A pumping light source to be supplied, a pumping light source driving means for driving the pumping light source, a filtering means for extracting the main signal wavelength component from the amplified signal, and a first and a second for the extracted main signal wavelength component. Direction branching means, an optical receiver for receiving the first direction branched main signal wavelength component, and an optical-electrical conversion for receiving the main signal wavelength component branched in the second direction. And a gain control means for controlling the pumping light source driving means so as to keep the output of the preamplifier means constant on the basis of the output electric signal. An optical wavelength division multiplexing receiver is obtained.
【０００７】また、本発明によれば、前記光波長分割多
重方式の受信装置において、前記複数の光受信ユニット
は、互いに異なる波長成分を選択することを特徴とする
光波長分割多重方式の受信装置が得られる。Further, according to the present invention, in the optical wavelength division multiplexing receiver, the plurality of optical receiver units select different wavelength components from each other. Is obtained.
【０００８】即ち、本発明の光波長分割多重方式の受信
装置は、伝送路からの光信号をＮ個に分岐する第１の光
分岐と、その一方の光出力は光直接増幅する希土類添加
光ファイバからなる光ファイバ増幅器に入力され、その
出力から主信号波長成分を選択する光帯域通過フィルタ
を経て、その出力を２方向に分岐する、第２の光分岐に
入力される。一方の出力を第１の光受信盤へ、他方を光
・電気変換する光検出器に入力し、その光検出器の出力
は利得制御回路へ接続され、又、利得制御回路の出力信
号で励起光源駆動回路を制御し、励起光源の出力を可変
し、光ファイバ増幅器の利得を光受信盤の最適点に制御
する。That is, the optical wavelength division multiplexing receiver of the present invention comprises a first optical branch for branching an optical signal from a transmission path into N pieces, and a light output of one of the first optical branches for rare-earth doped light for direct optical amplification. It is input to an optical fiber amplifier made of a fiber, passes through an optical bandpass filter that selects a main signal wavelength component from the output, and is input to a second optical branch that branches the output in two directions. One output is input to the first optical receiving board and the other is input to a photodetector that converts light to electricity, and the output of the photodetector is connected to the gain control circuit and also excited by the output signal of the gain control circuit. The light source drive circuit is controlled, the output of the pumping light source is varied, and the gain of the optical fiber amplifier is controlled to the optimum point of the optical receiver board.
【０００９】又、これらで構成される光受信ユニットが
Ｎ個の第１の光分岐に接続される。光受信ユニットはそ
れぞれ波長帯域の異なる光帯域通過フィルタを有してお
り、λ1 〜λn の波長を選択し、各々の光受信盤を最適
化するような制御回路を有している。An optical receiving unit composed of these is connected to the N first optical branches. Each optical receiving unit has an optical band pass filter having a different wavelength band, and has a control circuit for selecting a wavelength of λ 1 to λ n and optimizing each optical receiving board.
【００１０】[0010]
【実施例】次に本発明の実施例について図面を参照して
説明する。Embodiments of the present invention will now be described with reference to the drawings.
【００１１】図１は、本発明の一実施例を示すブロック
図である。伝送路からの光信号入力は１：Ｎ光分岐（Ｎ
は２以上の整数）により、Ｎ方向に分岐される。伝送路
からの光信号は、波長分割多重方式のため２波長以上の
成分が合成されている。Ｎ光分岐器１の第１の出力は、
希土類添加ファイバからなる光ファイバ増幅器２に入力
され、次に配置された光バンドパスフィルタ３（以下，
光Ｂ．Ｐ．Ｆ．と略す）に入力され、主信合波長成分が
選択される。又、この出力を光分岐器４に入力し一方を
光受信盤９に入力し他方を光・電気変換する光検出器５
に入力し、その出力電気信号は利得制御回路６に送ら
れ、励起光源駆動回路７を制御し、励起光源８の出力を
可変し、光ファイバ増幅器２の利得を制御する。FIG. 1 is a block diagram showing an embodiment of the present invention. The optical signal input from the transmission line is 1: N optical branch (N
Is an integer of 2 or more) and is branched in the N direction. The optical signal from the transmission line is composed of two or more wavelength components due to the wavelength division multiplexing method. The first output of the N optical branching device 1 is
The optical bandpass filter 3 (hereinafter, referred to as “optical bandpass filter 3”, which is input to the optical fiber amplifier 2 made of a rare earth-doped fiber, and arranged next.
Light B. P. F. Abbreviated), and the main-coupled wavelength component is selected. Further, this output is input to the optical branching device 4, one of which is input to the optical receiving board 9 and the other of which is photo-electrically converted into light.
To the gain control circuit 6 to control the pumping light source driving circuit 7 to vary the output of the pumping light source 8 and control the gain of the optical fiber amplifier 2.
【００１２】このような光受信ユニット１０がＮ個Ｎ光
分岐器１に接続される。個々の光受信ユニットには光源
波長λ1 〜λn を選択する波長帯域の異なる光Ｂ．Ｐ．
Ｆ．３を有しており、それぞれの光信号波長を選択す
る。又、それぞれの光ユニット１０はそれぞれの光受信
盤を最適化するように制御される。Such N optical receiving units 10 are connected to N N optical branching devices 1. For each light receiving unit, light B.1 having a different wavelength band for selecting the light source wavelengths λ 1 to λ n . P.
F. 3 and selects each optical signal wavelength. Further, each optical unit 10 is controlled so as to optimize each optical receiving board.
【００１３】[0013]
【発明の効果】以上説明したように、本発明は波長分割
多重方式で伝送された光信号よりそれぞれの波長成分を
選択する受信回路部において、光受信盤の入力光レベル
をモニタし、その情報を光ファイバ増幅器にフィードバ
ックし、利得を制御することで常に個々の光受信盤ごと
の最適化が計られる。As described above, according to the present invention, in the receiving circuit section for selecting each wavelength component from the optical signal transmitted by the wavelength division multiplexing system, the input light level of the optical receiving board is monitored and the information thereof is monitored. Is fed back to the optical fiber amplifier and the gain is controlled, so that the optimization can be performed for each individual optical receiving board.
【図１】本発明の一実施例のブロック図FIG. 1 is a block diagram of an embodiment of the present invention.
１ Ｎ光分岐器１ ２ 光ファイバ増幅器 ３ 光バンドパスフィルタ ４ 光分岐器 ２ 光ファイバ ５ 光検出器 ６ 利得制御回路 ７ 励起光源駆動回路 ８ 励起光源 ９ 光受信盤 １０〜Ｎ 光受信ユニット 1 N Optical splitter 1 2 Optical fiber amplifier 3 Optical bandpass filter 4 Optical splitter 2 Optical fiber 5 Photodetector 6 Gain control circuit 7 Pumping light source drive circuit 8 Pumping light source 9 Optical receiving board 10-N Optical receiving unit
Claims (3)
受けて増幅する光ファイバ増幅器と、増幅された光信号
から所定の波長成分を選択し、選択された選択光信号を
受ける光受信盤と含む複数の光受信ユニットを有する光
波長分割多重方式の受信装置において、 前記複数の光受信ユニットは、 前記光受信盤に入力される選択光信号のレベルをモニタ
するモニタ手段と、 該モニタされたレベルに基づいて、前記光ファイバ増幅
器の利得を制御する利得制御手段とを夫々有することを
特徴とする光波長分割多重方式の受信装置。1. An optical fiber amplifier for receiving and amplifying an optical signal transmitted by a wavelength division multiplexing system, and an optical receiver for selecting a predetermined wavelength component from the amplified optical signal and receiving the selected selected optical signal. In the optical wavelength division multiplexing receiver having a plurality of optical receiving units including, the plurality of optical receiving units are monitoring means for monitoring the level of a selected optical signal input to the optical receiving board, and the monitored means. And a gain control means for controlling the gain of the optical fiber amplifier based on the level.
入力信号を複数の方向に分岐するメイン分岐手段と、前
記複数に分岐された光分岐信号を受ける複数の光受信ユ
ニットとを有する光波長分割多重方式の受信装置におい
て、 前記複数の光受信ユニットは、 前記光分岐信号を受けて増幅して増幅信号を出力するプ
リアンプ手段と、 該プリアンプ手段に、励起光を供給する励起光源と、 該励起光源を駆動する励起光源駆動手段と、 前記増幅信号から、前記主信号波長成分を抽出するフィ
ルタ手段と、 前記抽出された主信号波長成分を第１および第２の方向
に分岐するサブ分岐手段と、 前記第１の方向分岐された主信号波長成分を受ける光受
信盤と、 前記第２の方向に分岐された主信号波長成分を受け、光
・電気変換して出力電気信号を生成する変換手段と、 前記出力電気信号に基づいて、前記プリアンプ手段の出
力を一定にするように、前記励起光源駆動手段を制御す
る利得制御手段と、 を夫々有することを特徴とする光波長分割多重方式の受
信装置。2. A light having main branching means for branching a wavelength-multiplexed optical input signal containing a main signal wavelength component into a plurality of directions, and a plurality of optical receiving units for receiving the plurality of branched optical branch signals. In the wavelength division multiplexing receiver, the plurality of optical receiving units include a preamplifier unit that receives and amplifies the optical branch signal and outputs an amplified signal, and a pumping light source that supplies pumping light to the preamplifier unit. Pumping light source driving means for driving the pumping light source, filtering means for extracting the main signal wavelength component from the amplified signal, and sub-branch for branching the extracted main signal wavelength component in first and second directions Means, an optical receiver for receiving the main signal wavelength component branched in the first direction, and an optical receiver for receiving the main signal wavelength component branched in the second direction, and performing an optical / electrical conversion to generate an output electric signal. And a gain control means for controlling the pumping light source driving means so as to make the output of the preamplifier means constant based on the output electric signal. Method receiver.
方式の受信装置において、前記複数の光受信ユニット
は、互いに異なる波長成分を選択することを特徴とする
光波長分割多重方式の受信装置。3. The optical wavelength division multiplexing receiver according to claim 1, wherein the plurality of optical receiver units select different wavelength components from each other. ..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4032037A JPH05235902A (en) | 1992-02-19 | 1992-02-19 | Receiver for optical wavelength division multiplex system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4032037A JPH05235902A (en) | 1992-02-19 | 1992-02-19 | Receiver for optical wavelength division multiplex system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05235902A true JPH05235902A (en) | 1993-09-10 |
Family
ID=12347678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4032037A Pending JPH05235902A (en) | 1992-02-19 | 1992-02-19 | Receiver for optical wavelength division multiplex system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05235902A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0854602A1 (en) * | 1997-01-20 | 1998-07-22 | Alcatel | Optical demultiplexing device and communication system including such a device |
| JP2002050816A (en) * | 2000-08-02 | 2002-02-15 | Fujitsu Ltd | Optical amplifier |
| US6525871B2 (en) | 1995-04-05 | 2003-02-25 | Hitachi, Ltd. | Optical amplification apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6290042A (en) * | 1985-10-15 | 1987-04-24 | Nippon Telegr & Teleph Corp <Ntt> | Demultiplexing circuit |
| JPH02281831A (en) * | 1989-04-24 | 1990-11-19 | Nippon Telegr & Teleph Corp <Ntt> | Optical shutdown system |
-
1992
- 1992-02-19 JP JP4032037A patent/JPH05235902A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6290042A (en) * | 1985-10-15 | 1987-04-24 | Nippon Telegr & Teleph Corp <Ntt> | Demultiplexing circuit |
| JPH02281831A (en) * | 1989-04-24 | 1990-11-19 | Nippon Telegr & Teleph Corp <Ntt> | Optical shutdown system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6525871B2 (en) | 1995-04-05 | 2003-02-25 | Hitachi, Ltd. | Optical amplification apparatus |
| US6839161B2 (en) | 1995-04-05 | 2005-01-04 | Hitachi, Ltd. | Optical amplification apparatus |
| EP0854602A1 (en) * | 1997-01-20 | 1998-07-22 | Alcatel | Optical demultiplexing device and communication system including such a device |
| FR2758674A1 (en) * | 1997-01-20 | 1998-07-24 | Alsthom Cge Alcatel | OPTICAL DEMULTIPLEXER DEVICE AND COMMUNICATION SYSTEM COMPRISING THE SAME |
| JP2002050816A (en) * | 2000-08-02 | 2002-02-15 | Fujitsu Ltd | Optical amplifier |
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|---|---|---|---|
| A02 | Decision of refusal |
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