JPH05259562A - Optical fiber amplifier - Google Patents
Optical fiber amplifierInfo
- Publication number
- JPH05259562A JPH05259562A JP4086343A JP8634392A JPH05259562A JP H05259562 A JPH05259562 A JP H05259562A JP 4086343 A JP4086343 A JP 4086343A JP 8634392 A JP8634392 A JP 8634392A JP H05259562 A JPH05259562 A JP H05259562A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- terminal
- multiplexer
- output
- optical 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.)
- Granted
Links
Landscapes
- Lasers (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は光ファイバ増幅器に関
し、特に光出力を一定にする機能を有する光ファイバ増
幅器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber amplifier, and more particularly to an optical fiber amplifier having a function of keeping the optical output constant.
【０００２】[0002]
【従来の技術】図３に、従来の光ファイバ増幅器の実施
例を示す。これは、前方向励起方式と呼ばれるものであ
る。光信号端子Ａは合波器１の第１の端子と、第２の光
電気変換器５の入力端子に接続され、エルビウムドープ
ファイバ３の入力は合波器１の出力端子に接続されてい
る。又、エルビウムドープファイバの出力端子は第１の
光電気変換器４の入力端子と光信号端子Ｂとに接続され
ている。第１の光電気変換器４の出力端子は励起光源２
の入力端子に接続され、監視制御回路６の入力端子は第
２の光電気変換器５の出力端子に接続され、励起光源２
の出力端子は合波器１の入力端子に接続されている。2. Description of the Related Art FIG. 3 shows an embodiment of a conventional optical fiber amplifier. This is called the forward excitation method. The optical signal terminal A is connected to the first terminal of the multiplexer 1 and the input terminal of the second photoelectric converter 5, and the input of the erbium-doped fiber 3 is connected to the output terminal of the multiplexer 1. .. The output terminal of the erbium-doped fiber is connected to the input terminal of the first photoelectric converter 4 and the optical signal terminal B. The output terminal of the first photoelectric converter 4 is the pump light source 2
Is connected to the input terminal of the monitoring control circuit 6 and the output terminal of the second photoelectric converter 5 is connected to the excitation light source 2
The output terminal of is connected to the input terminal of the multiplexer 1.
【０００３】 次に、動作を説明する。この形の光ファ
イバ増幅器７は、励起光源２によって励起光を発生さ
せ、この励起光をエルビウムドープファイバ３中を伝搬
させることによりファイバ中のＥｒ原子を高いエネルギ
ー準位に励起し、そこへ信号光が入ると、誘導放出が生
じて信号光が増幅される仕組みになっている。しかし、
励起光源２の光出力に安定性がないため、エルビウムド
ープファイバの光出力を光電気変換器４によって電気信
号に変換し、励起光源２に接続することで、ループを構
成し、エルビウムドープファイバ３の光出力を一定に保
つように作動させることができる。Next, the operation will be described. The optical fiber amplifier 7 of this type generates pumping light by the pumping light source 2 and propagates the pumping light in the erbium-doped fiber 3 to pump Er atoms in the fiber to a high energy level, and signal to the Er atom. When light enters, stimulated emission occurs and the signal light is amplified. But,
Since the optical output of the pumping light source 2 is not stable, the optical output of the erbium-doped fiber is converted into an electrical signal by the photoelectric converter 4 and connected to the pumping light source 2 to form a loop, and the erbium-doped fiber 3 Can be operated to keep the light output of the device constant.
【０００４】例えば、ある光出力一定の状態から励起光
源２の光出力が高くなった場合、合波器１の光出力が高
くなり、それにより光電気変換器４の出力電圧値が高く
なる。その電圧値が高くなることで、励起光源２の光出
力は下がる方向に作動する。つまり、光出力は元の値と
なる。また、ある光出力一定の状態から励起光源２の光
出力が低くなった場合には、逆の動作で一定値となる。
図４に示す従来例は、後方励起方式と呼ばれており、エ
ルビウムドープファイバ３を光信号端子Ａと合波器１と
の間に接続したものである。図４において、図３と同様
の要素には、同様の符号が付してある。動作の説明は、
図３と同様に合波器１の光出力を一定に保つように働
く。For example, when the optical output of the pumping light source 2 is increased from a certain optical output constant state, the optical output of the multiplexer 1 is increased, which increases the output voltage value of the photoelectric converter 4. As the voltage value increases, the light output of the pumping light source 2 operates in the lowering direction. That is, the optical output becomes the original value. Further, when the light output of the pumping light source 2 becomes low from a certain light output constant state, it becomes a constant value by the reverse operation.
The conventional example shown in FIG. 4 is called a backward pumping method, in which an erbium-doped fiber 3 is connected between an optical signal terminal A and a multiplexer 1. 4, the same elements as those in FIG. 3 are denoted by the same reference numerals. The explanation of the operation is
Similar to FIG. 3, it works to keep the optical output of the multiplexer 1 constant.
【０００５】[0005]
【発明が解決しようとする課題】解決しようとする問題
は、従来の光ファイバ増幅器では片方向のみへの伝送が
行われる方式であり、また伝送容量を可変することがで
きない点である。The problem to be solved is that the conventional optical fiber amplifier is a system in which transmission is performed in only one direction, and the transmission capacity cannot be varied.
【０００６】[0006]
【課題を解決するための手段】本発明の光ファイバ増幅
器は、両側の光信号端子のそれぞれに光スイッチを接続
し、そのスイッチを制御することで双方向伝送を可能と
する点に特長がある。The optical fiber amplifier of the present invention is characterized in that an optical switch is connected to each of the optical signal terminals on both sides and bidirectional transmission is enabled by controlling the switch. ..
【０００７】[0007]
【実施例】次に本発明について図面を参照して説明す
る。図１は、本発明による光ファイバ増幅器の第１の実
施例を示すブロック図である。図１において、１は合波
器，２は励起光源，３はエルビウムドープファイバ，４
は第１の光電気変換器，５は第２の光電気変換器，６は
監視制御回路，８は第１の光スイッチ，９は第２の光ス
イッチ，７０は光ファイバ増幅器である。The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of an optical fiber amplifier according to the present invention. In FIG. 1, 1 is a multiplexer, 2 is an excitation light source, 3 is an erbium-doped fiber, 4
Is a first photoelectric converter, 5 is a second photoelectric converter, 6 is a supervisory control circuit, 8 is a first optical switch, 9 is a second optical switch, and 70 is an optical fiber amplifier.
【０００８】光信号端子Ａは合波器の第１の端子と光ス
イッチ８の入力端子とに接続され、第１の光スイッチ８
の第１の出力端子は第２の光スイッチ８の第１の出力端
子と、第１の光電気変換器４の入力端子とに接続されて
いる。第１の光スイッチ８の第２の出力端子は第２の光
スイッチ９の第２の出力端子と、第２の光電気変換器５
の入力端子とに接続され、第２の光電気変換器５の出力
端子は監視制御回路６の入力端子に接続されている。監
視制御回路６の第１の出力端子は第１の光スイッチ８の
制御端子に接続され、その第２の出力端子は第２の光ス
イッチ９の制御端子に接続されている。励起光源２の入
力端子は、第１の光電気変換器４の出力端子に接続さ
れ、励起光源２の出力端子は合波器１の入力端子に接続
されている。光信号端子Ｂは第２の光スイッチ９の入力
端子と合波器１の第２の端子とに接続され、第２の光ス
イッチ９の入力端子と合波器１の第２の端子とのあいだ
にエルビウムドープファイバが接続されている。The optical signal terminal A is connected to the first terminal of the multiplexer and the input terminal of the optical switch 8, and the first optical switch 8
The first output terminal of is connected to the first output terminal of the second optical switch 8 and the input terminal of the first photoelectric converter 4. The second output terminal of the first optical switch 8 is connected to the second output terminal of the second optical switch 9 and the second photoelectric converter 5
, And the output terminal of the second photoelectric converter 5 is connected to the input terminal of the monitor control circuit 6. The first output terminal of the supervisory control circuit 6 is connected to the control terminal of the first optical switch 8, and its second output terminal is connected to the control terminal of the second optical switch 9. The input terminal of the pumping light source 2 is connected to the output terminal of the first photoelectric converter 4, and the output terminal of the pumping light source 2 is connected to the input terminal of the multiplexer 1. The optical signal terminal B is connected to the input terminal of the second optical switch 9 and the second terminal of the multiplexer 1, and the optical signal terminal B connects the input terminal of the second optical switch 9 and the second terminal of the multiplexer 1. An erbium-doped fiber is connected between them.
【０００９】次に、動作について説明する。光信号端子
Ａから光信号端子Ｂへ信号を送る場合を考える。光信号
端子Ａ、または光信号端子Ｂからの光信号は第１の光ス
イッチ８または第２の光スイッチ９を介して第２の光電
気変換器５に入力され、監視制御回路６へと送られる。
監視制御回路６は、第１の光スイッチ８を制御し、光信
号端子Ａと第２の光電気変換器５とを接続すると同時
に、第２の光スイッチ９を制御し、光信号端子Ｂと第１
の光電気変換器４とを接続する。この回路構成は従来例
の前方向励起方式と同様であり、動作も同様である。Next, the operation will be described. Consider a case where a signal is sent from the optical signal terminal A to the optical signal terminal B. The optical signal from the optical signal terminal A or the optical signal terminal B is input to the second photoelectric converter 5 via the first optical switch 8 or the second optical switch 9 and sent to the monitor control circuit 6. Be done.
The supervisory control circuit 6 controls the first optical switch 8 to connect the optical signal terminal A and the second opto-electrical converter 5, and at the same time controls the second optical switch 9 to connect the optical signal terminal B to the optical signal terminal B. First
Is connected to the photoelectric converter 4. This circuit configuration is similar to that of the conventional forward excitation method, and the operation is also similar.
【００１０】逆に、光信号端子Ｂから光信号端子Ａへ信
号をおくる場合を考える。この場合も、同様に光信号端
子Ａ，または光信号端子Ｂからの光信号は、第１の光ス
イッチ８または第２の光スイッチ９を介して第２の光電
気変換器５に入力され、監視制御回路６へと送られる。
監視制御回路６は、第１の光スイッチ８を制御し、光信
号端子Ａと第１の光電気変換器４とを接続すると同時
に、第２の光スイッチ９を制御し、光信号端子Ｂと第２
の光電気変換器５とを接続する。この回路構成は従来例
の前方向励起方式と同様であり、動作も同様である。On the contrary, consider a case where a signal is sent from the optical signal terminal B to the optical signal terminal A. Also in this case, similarly, the optical signal from the optical signal terminal A or the optical signal terminal B is input to the second photoelectric converter 5 via the first optical switch 8 or the second optical switch 9, It is sent to the monitor control circuit 6.
The supervisory control circuit 6 controls the first optical switch 8 to connect the optical signal terminal A and the first opto-electrical converter 4, and at the same time controls the second optical switch 9 to connect the optical signal terminal B to the optical signal terminal B. Second
It is connected to the photoelectric converter 5. This circuit configuration is similar to that of the conventional forward excitation method, and the operation is also similar.
【００１１】次に、他の実施例について説明する。図２
は本発明による光ファイバ増幅器の第２の実施例を示す
ブロック図である。図２において、７１は光ファイバ増
幅器である図１と同様な要素には、同様な符号を付して
ある。接続は図１の場合とは逆であり、エルビウムドー
プファイバ３が光信号端子Ａと合波器１の第１の端子と
の間に接続されている。これ以外は、図１と同様であ
る。動作も第１の実施例と同様であるが、光信号端子Ａ
から光信号端子Ｂへ信号を送る場合には、後方励起方
式、光信号端子Ｂから光信号端子Ａへ信号を送る場合に
は前方励起方式となる。Next, another embodiment will be described. Figure 2
FIG. 3 is a block diagram showing a second embodiment of the optical fiber amplifier according to the present invention. In FIG. 2, 71 is an optical fiber amplifier, and the same elements as those in FIG. 1 are denoted by the same reference numerals. The connection is the reverse of the case of FIG. 1, and the erbium-doped fiber 3 is connected between the optical signal terminal A and the first terminal of the multiplexer 1. Other than this, it is the same as FIG. The operation is similar to that of the first embodiment, except that the optical signal terminal A
When the signal is sent from the optical signal terminal B to the optical signal terminal B, the backward pumping method is used, and when the signal is sent from the optical signal terminal B to the optical signal terminal A, the forward pumping method is used.
【００１２】[0012]
【発明の効果】以上説明したように本発明は、一対の光
スイッチを追加し、これら一対の光スイッチを監視制御
回路により制御することで双方向伝送が可能となる利点
がある。As described above, the present invention has an advantage that bidirectional transmission becomes possible by adding a pair of optical switches and controlling the pair of optical switches by the supervisory control circuit.
【図１】本発明による光ファイバ増幅器の第１の実施例
を示すブロック図である。FIG. 1 is a block diagram showing a first embodiment of an optical fiber amplifier according to the present invention.
【図２】本発明による光ファイバ増幅器の第２の実施例
を示すブロック図である。FIG. 2 is a block diagram showing a second embodiment of the optical fiber amplifier according to the present invention.
【図３】従来技術による前方向励起方式の光ファイバ増
幅器の一例を示すブロック図である。FIG. 3 is a block diagram showing an example of a forward-pumping type optical fiber amplifier according to a conventional technique.
【図４】従来技術による後方向励起方式の光ファイバ増
幅器の一例を示すブロック図である。FIG. 4 is a block diagram showing an example of a backward pumping type optical fiber amplifier according to the prior art.
１ 合波器 ２ 励起光源 ３ エルビウムドープファイバ ４，５ 光電気変換器 ６ 監視制御回路 ７，７０，７１ 光ファイバ増幅器 ８，９ 光スイッチ Ａ，Ｂ 光信号端子 1 Multiplexer 2 Pumping Light Source 3 Erbium Doped Fiber 4,5 Optoelectric Converter 6 Monitoring and Control Circuit 7, 70, 71 Optical Fiber Amplifier 8, 9 Optical Switch A, B Optical Signal Terminal
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｈ０４Ｑ 3/52 Ｂ 9076−5Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location // H04Q 3/52 B 9076-5K
Claims (4)
プファイバと、 前記エルビウムドープファイバに励起光を与えるための
励起光源と、 前記励起光源からの励起光を入力して光信号と混合し、
前記エルビウムドープファイバへ送出するための合波器
と、 伝送される前記信号光の方向を切り替えるための第１お
よび第２の光スイッチと、 前記一対の光スイッチにより送られてきた出力側の光信
号を電気信号に変換し、前記励起光源に帰還するための
第１の光電気変換器と、 前記一対の光スイッチにより送られてきた入力側の光信
号を電気信号に変換するための第２の光電気変換器と、 前記第２の光電気変換器の出力により前記一対の光スイ
ッチの伝送方向を切り替えるための監視制御回路とを備
えた光ファイバ増幅器。1. An erbium-doped fiber for amplifying signal light, a pumping light source for supplying pumping light to the erbium-doped fiber, and pumping light from the pumping light source is input and mixed with an optical signal,
A multiplexer for sending to the erbium-doped fiber, first and second optical switches for switching the direction of the signal light to be transmitted, and light on the output side sent by the pair of optical switches. A first opto-electric converter for converting a signal into an electric signal and returning it to the excitation light source, and a second opto-electric converter for converting an input-side optical signal sent by the pair of optical switches into an electric signal. 2. An optical fiber amplifier comprising: the opto-electric converter of claim 1; and a supervisory control circuit for switching the transmission direction of the pair of optical switches according to the output of the second opto-electric converter.
の光信号端子を設け、前記第２の光信号端子と前記合波
器との間に前記エルビウムドープファイバを接続した請
求項１の光ファイバ増幅器。2. A first and a second for transmitting and receiving an optical signal.
2. The optical fiber amplifier according to claim 1, wherein said optical signal terminal is provided, and said erbium-doped fiber is connected between said second optical signal terminal and said multiplexer.
の光信号端子を設け、前記第１の光信号端子と前記合波
器との間に前記エルビウムドープファイバを接続した請
求項１の光ファイバ増幅器。3. A first and a second for transmitting and receiving an optical signal.
2. The optical fiber amplifier according to claim 1, wherein said optical signal terminal is provided, and said erbium-doped fiber is connected between said first optical signal terminal and said multiplexer.
１の端子と前記第１の光スイッチの入力端子とに接続さ
れ、前記第１の光スイッチの第１の出力は前記第２の光
スイッチの第１の出力端子と前記第１の光電気変換器の
入力端子とに接続され、前記第１の光スイッチの第２の
出力端子は前記第２の光スイッチの第２の光電気変換器
の入力端子に接続され、前記第２の光電気変換器の出力
端子は前記監視制御回路の第２の出力端子は前記第２の
光スイッチの制御端子に接続され、前記励起光源の入力
端子は前記第１の光電気変換器の出力端子に接続され、
前記励起光源の出力端子は前記合波器の入力に接続さ
れ、前記第２の光信号端子は前記第２の光スイッチの入
力と前記合波器の第２の端子に接続され、前記第１の光
スイッチの入力端子と前記合波器の第１の端子との間、
または前記第２の光スイッチの入力と前記合波器の第２
の端子との間に前記エルビウムドープファイバを接続し
て構成したことを特徴とする請求項１〜請求項３の光フ
ァイバ増幅器。4. The first optical signal terminal is connected to a first terminal of the multiplexer and an input terminal of the first optical switch, and a first output of the first optical switch is A second output terminal of the second optical switch is connected to a first output terminal of the second optical switch and an input terminal of the first optical-electrical converter, and a second output terminal of the first optical switch is a second output terminal of the second optical switch. Connected to the input terminal of the opto-electrical converter, the output terminal of the second opto-electrical converter is connected to the control terminal of the second optical switch, and the second output terminal of the supervisory control circuit is connected to the excitation terminal. An input terminal of the light source is connected to an output terminal of the first photoelectric converter,
The output terminal of the pumping light source is connected to the input of the multiplexer, the second optical signal terminal is connected to the input of the second optical switch and the second terminal of the multiplexer, and Between the input terminal of the optical switch and the first terminal of the multiplexer,
Or the input of the second optical switch and the second of the multiplexer.
The optical fiber amplifier according to any one of claims 1 to 3, wherein the erbium-doped fiber is connected between the terminal and the terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04086343A JP3082409B2 (en) | 1992-03-10 | 1992-03-10 | Optical fiber amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04086343A JP3082409B2 (en) | 1992-03-10 | 1992-03-10 | Optical fiber amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05259562A true JPH05259562A (en) | 1993-10-08 |
| JP3082409B2 JP3082409B2 (en) | 2000-08-28 |
Family
ID=13884219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04086343A Expired - Fee Related JP3082409B2 (en) | 1992-03-10 | 1992-03-10 | Optical fiber amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3082409B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0701308A1 (en) * | 1994-08-27 | 1996-03-13 | Robert Bosch Gmbh | Circuit device for an amplifying fibre |
-
1992
- 1992-03-10 JP JP04086343A patent/JP3082409B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0701308A1 (en) * | 1994-08-27 | 1996-03-13 | Robert Bosch Gmbh | Circuit device for an amplifying fibre |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3082409B2 (en) | 2000-08-28 |
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