JP2964767B2 - Optical repeater - Google Patents
Optical repeaterInfo
- Publication number
- JP2964767B2 JP2964767B2 JP4053244A JP5324492A JP2964767B2 JP 2964767 B2 JP2964767 B2 JP 2964767B2 JP 4053244 A JP4053244 A JP 4053244A JP 5324492 A JP5324492 A JP 5324492A JP 2964767 B2 JP2964767 B2 JP 2964767B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- output
- center wavelength
- bandpass filter
- signal
- 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.)
- Expired - Lifetime
Links
- 230000003287 optical effect Effects 0.000 title claims description 36
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Landscapes
- Lasers (AREA)
- Optical Communication System (AREA)
- Optical Filters (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は光増幅器を有する光中継
器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical repeater having an optical amplifier.
【０００２】[0002]
【従来の技術】光信号を直接増幅する光増幅器について
は、光／電気変換が不要であり、構成が簡単であるこ
と、信号のビットレート及びフォーマットに依存しない
こと、高出力、高利得が得られ低雑音であること等、そ
の優れた性能のために、様々な分野への適用が考えられ
開発が進められており、その一つに中継伝送への応用が
ある。2. Description of the Related Art An optical amplifier for directly amplifying an optical signal does not require optical / electrical conversion, has a simple structure, does not depend on the bit rate and format of a signal, and has a high output and a high gain. Due to its excellent performance such as low noise, it is considered to be applied to various fields and is being developed, one of which is application to relay transmission.
【０００３】光中継器として多段に接続して使用する場
合に、光増幅器から出る雑音光の累積が課題となる。こ
の雑音光は自然放出光と呼ばれるものであり、多中継し
て累積されると、後段の光増幅器が自然放出光によって
飽和が生じ、本来の信号の増幅特性が損なわれる。[0003] When the optical repeaters are used in a multi-stage connection, accumulation of noise light emitted from the optical amplifier becomes a problem. This noise light is called spontaneous emission light. If the noise light is accumulated in multiple repeats, the optical amplifier at the subsequent stage is saturated by the spontaneous emission light, and the amplification characteristics of the original signal are impaired.
【０００４】本課題を解決するためには、光増幅器に光
バンドパスフィルタを挿入し、信号光以外の雑音光を次
段の光増幅器に送らない方法が考えられてきた。To solve this problem, a method has been considered in which an optical band-pass filter is inserted into an optical amplifier so that noise light other than signal light is not sent to the next-stage optical amplifier.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、雑音光
を抑えるには狭帯域の光バンドパスフィルタが必要であ
り、多中継したときの帯域幅が、光バンドパスフィルタ
の通過特性の積算となるために非常に狭くなり、送信信
号波長の許容偏差が厳しく制限されること、また、光バ
ンドパスフィルタ自体の中心波長の許容偏差も小さく抑
える必要があるという課題を有していた。However, in order to suppress noise light, a narrow band optical bandpass filter is required, and the bandwidth at the time of multi-repeating becomes the integration of the pass characteristics of the optical bandpass filter. Therefore, there is a problem that the allowable deviation of the transmission signal wavelength is severely restricted, and that the allowable deviation of the center wavelength of the optical bandpass filter itself needs to be reduced.
【０００６】本発明は従来の上記実情に鑑みてなされた
ものであり、従って本発明の目的は、従来の技術に内在
する上記課題を解決することを可能とした新規な光中継
器を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a novel optical repeater which can solve the above-mentioned problems inherent in the prior art. It is in.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る光中継器は、光増幅器の出力に中心波
長可変バンドパスフィルタを設け、この中心波長可変バ
ンドパスフィルタの出力を光分波器に入力し、この光分
波器の一方の出力を光中継器出力とし、他方の出力を光
検出器に入力し、この光検出器の出力を前記中心波長可
変バンドパスフィルタの制御回路に接続して構成され
る。To achieve the above object, an optical repeater according to the present invention is provided with a center wavelength tunable bandpass filter at the output of an optical amplifier, and the output of the center wavelength tunable bandpass filter is provided. Input to an optical demultiplexer, one output of the optical demultiplexer is used as an optical repeater output, the other output is input to a photodetector, and the output of the photodetector is used as the output of the center wavelength variable bandpass filter. It is configured by connecting to a control circuit.
【０００８】[0008]
【実施例】次に本発明をその好ましい一実施例について
図面を参照して具体的に説明する。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of the present invention.
【０００９】図１は本発明の一実施例を示すブロック構
成図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
【００１０】図１を参照するに、光増幅器１の出力に中
心波長可変バンドパスフィルタ（可変ＢＰＦ）２が接続
され、さらに中心波長可変バンドパスフィルタ２の出力
は光分波器３に接続されている。光分波器３の出力の一
方は光検出器４に入力され、光検出器４の出力は制御回
路５の入力に接続さている。制御回路５の制御出力は中
心波長可変バンドパスフィルタの制御端子に接続されて
いる。Referring to FIG. 1, a center wavelength variable bandpass filter (variable BPF) 2 is connected to an output of an optical amplifier 1, and an output of the center wavelength variable bandpass filter 2 is connected to an optical demultiplexer 3. ing. One of the outputs of the optical demultiplexer 3 is input to the photodetector 4, and the output of the photodetector 4 is connected to the input of the control circuit 5. The control output of the control circuit 5 is connected to the control terminal of the center wavelength variable bandpass filter.
【００１１】次に本発明の動作について説明する。Next, the operation of the present invention will be described.
【００１２】図２（ａ）に示すように、中心波長可変バ
ンドパスフィルタ２の中心波長λｏに対して信号波長λ
ｓがずれている場合、中心波長可変バンドパスフィルタ
２の通過損失が大きいために、信号が減衰する。従っ
て、光検出器４の出力が低下し、それに応じて制御回路
５が光信号が大きくなる方向に中心波長可変バンドパス
フィルタ２の中心波長を変化させる。その結果、図２
（ｂ）に示すように、λｓ＝λｏとなり、信号波長と中
心波長可変バンドパスフィルタ２の中心波長が一致す
る。As shown in FIG. 2A, the center wavelength λo of the center wavelength tunable bandpass filter 2 is
When s is shifted, the signal is attenuated because the passing loss of the center wavelength variable bandpass filter 2 is large. Accordingly, the output of the photodetector 4 decreases, and the control circuit 5 changes the center wavelength of the center wavelength variable bandpass filter 2 in the direction in which the optical signal increases accordingly. As a result, FIG.
As shown in (b), λs = λo, and the signal wavelength matches the center wavelength of the center wavelength variable bandpass filter 2.
【００１３】[0013]
【発明の効果】以上説明したように、本発明によれば、
中心波長可変バンドパスフィルタを使用し、信号波長と
バンドパスフィルタの中心波長が一致するように制御す
ることによって、狭帯域のバンドパスフィルタを使用で
きると共に光増幅器の自然放出光の影響を低減すること
ができ、送信信号波長の許容度が広がるという効果が得
られる。As described above, according to the present invention,
By using a center wavelength tunable bandpass filter and controlling the signal wavelength to match the center wavelength of the bandpass filter, a narrowband bandpass filter can be used and the effect of spontaneous emission light from the optical amplifier is reduced. Therefore, the effect of increasing the tolerance of the transmission signal wavelength is obtained.
【図１】本発明の一実施例を示すブロック構成図であ
る。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】バンドパスフィルタの通過特性と信号波長の関
係を示した図である。FIG. 2 is a diagram illustrating a relationship between a pass characteristic of a bandpass filter and a signal wavelength.
１…光増幅器 ２…中心波長可変バンドパスフィルタ ３…光分波器 ４…光検出器 ５…制御回路 DESCRIPTION OF SYMBOLS 1 ... Optical amplifier 2 ... Center wavelength variable band-pass filter 3 ... Optical demultiplexer 4 ... Photodetector 5 ... Control circuit
Claims (1)
光中継器において、光増幅器の出力に中心波長可変狭帯
域バンドパスフィルタを有し、該中心波長可変狭帯域バ
ンドパスフィルタの出力を光分波器に入力し、該光分波
器の一方の出力を光中継器出力とし、他方の出力を光検
出器に入力し、該光検出器の出力のみを前記中心波長可
変バンドパスフィルタの制御回路に接続し、信号波長と
前記バンドパスフィルタの中心波長が一致するように制
御することを特徴とした光中継器。1. An optical repeater having an optical amplifier for directly amplifying an optical signal, wherein an output of the optical amplifier has a center wavelength variable narrow band.
Has a frequency band pass filter, receives the output of said center wavelength tunable narrowband bus <br/> command pass filter to the optical demultiplexer, the one output of the optical demultiplexer and the optical repeater output, other Is output to the photodetector, and only the output of the photodetector is connected to the control circuit of the center wavelength variable bandpass filter, and the signal wavelength and
Control so that the center wavelengths of the bandpass filters match.
An optical repeater characterized by control .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4053244A JP2964767B2 (en) | 1992-03-12 | 1992-03-12 | Optical repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4053244A JP2964767B2 (en) | 1992-03-12 | 1992-03-12 | Optical repeater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05259990A JPH05259990A (en) | 1993-10-08 |
| JP2964767B2 true JP2964767B2 (en) | 1999-10-18 |
Family
ID=12937385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4053244A Expired - Lifetime JP2964767B2 (en) | 1992-03-12 | 1992-03-12 | Optical repeater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2964767B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2715883B2 (en) * | 1993-12-28 | 1998-02-18 | 日本電気株式会社 | Optical amplifier |
| JP4553609B2 (en) * | 2004-03-12 | 2010-09-29 | 富士通株式会社 | Optical transmission system with noise removal function |
-
1992
- 1992-03-12 JP JP4053244A patent/JP2964767B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05259990A (en) | 1993-10-08 |
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