JPH05315692A - Optical fiber amplifier - Google Patents
Optical fiber amplifierInfo
- Publication number
- JPH05315692A JPH05315692A JP12151492A JP12151492A JPH05315692A JP H05315692 A JPH05315692 A JP H05315692A JP 12151492 A JP12151492 A JP 12151492A JP 12151492 A JP12151492 A JP 12151492A JP H05315692 A JPH05315692 A JP H05315692A
- Authority
- JP
- Japan
- Prior art keywords
- output
- input
- optical
- multiplexer
- light source
- 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.)
- Withdrawn
Links
Landscapes
- Lasers (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例を示
す。2. Description of the Related Art FIG. 3 shows an example of a conventional optical fiber amplifier.
【０００３】光信号入力は合波器１の第１の入力と第１
の光電気変換器３の入力とに接続され、エルビウムドー
プファイバ２の入力は合波器１の出力と第２の光電気変
換器６の入力とに接続され、このエルビウムドープファ
イバ２の出力は光信号出力となり、この第２の光電気変
換器６の出力は励起光源４の第１の入力に接続され、監
視制御回路５の入力は第１の光電気変換器３の出力に接
続され、この監視制御回路５の出力は各部モニタ（図示
省略）に接続され、励起光源４の出力は合波器１の第２
の入力に接続される。The optical signal input is the first input and the first input of the multiplexer 1.
Of the erbium-doped fiber 2 is connected to the input of the optical converter 3 and the input of the erbium-doped fiber 2 is connected to the output of the multiplexer 1 and the input of the second photoelectric converter 6. It becomes an optical signal output, the output of the second photoelectric converter 6 is connected to the first input of the pumping light source 4, the input of the monitoring control circuit 5 is connected to the output of the first photoelectric converter 3, The output of the supervisory control circuit 5 is connected to a monitor (not shown) of each part, and the output of the pumping light source 4 is the second output of the multiplexer 1.
Connected to the input of.
【０００４】次に動作を説明する。Next, the operation will be described.
【０００５】この光ファイバ増幅器は励起光源４にて励
起光を発生させこの励起光と減衰してきた光信号とを合
波器１にて合成しエルビウムドープファイバ２中を伝搬
させることで光信号を増幅させる仕組みになっている。
しかし、励起光源４の光出力に安定性がないため合波器
１の光出力を光電気変換器６にて電気に変換し励起光源
４に接続することでループを構成し、励起光源４の光出
力を一定に保つ様に作動する。In this optical fiber amplifier, a pumping light source 4 generates pumping light, the pumping light and the attenuated optical signal are combined by a multiplexer 1 and propagated through an erbium-doped fiber 2 to generate an optical signal. It is a mechanism to amplify.
However, since the optical output of the pumping light source 4 is not stable, a loop is formed by converting the optical output of the multiplexer 1 into electricity by the photoelectric converter 6 and connecting it to the pumping light source 4. It works to keep the light output constant.
【０００６】例えば、ある光出力一定の状態から励起光
源４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６の出力電圧値が高くな
る。そしてその電圧値が高くなることで励起光源４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４の光
出力が低くなった場合は逆の動作で一定値となる。For example, when the optical output of the pumping light source 4 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 6. Then, as the voltage value becomes higher, the optical output of the pumping light source 4 operates in the lowering direction. That is, the optical output becomes the original value. Further, when the light output of the pumping light source 4 decreases from a certain light output constant state, the operation is reversed to a constant value.
【０００７】[0007]
【発明が解決しようとする課題】この従来の光ファイバ
増幅器では光出力を外部から変更したい時など変更でき
ず光出力を自由に制御できないという問題点がある。This conventional optical fiber amplifier has a problem that the optical output cannot be freely controlled because the optical output cannot be changed externally.
【０００８】[0008]
【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、従来の構成に加えて、光電気変換器の出力と励起
光源の間に監視制御回路から基準電圧を制御できる電圧
比較器を接続、または合波器の出力と光電気変換器の間
に監視制御回路から光減衰量を制御できる光減衰器を接
続した構成になっている。The optical fiber amplifier of the present invention has, in addition to the conventional structure, a voltage comparator capable of controlling a reference voltage from a supervisory control circuit between the output of the photoelectric converter and the pumping light source. Alternatively, an optical attenuator capable of controlling the amount of optical attenuation from the supervisory control circuit is connected between the output of the multiplexer and the optoelectric converter.
【０００９】[0009]
【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は本発明の第１の実施例のブロック図である。The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the first embodiment of the present invention.
【００１０】光信号入力は合波器１の第１の入力と光電
気変換器３の入力とに接続され、エルビウムドープファ
イバ２の入力は合波器１の出力と光電気変換器６の入力
とに接続され、エルビウムドープファイバ２の出力は光
信号出力となり、電圧比較器８の第１の入力は光電気変
換器６の出力と接続され、また電圧比較器の第２の入力
は監視制御回路５の出力に接続され、この電圧比較器８
の出力は励起光源４の入力に接続され、監視制御回路５
の入力は光電気変換器６の出力に接続され、励起光源４
の出力は合波器１の第２の入力に接続されている。The optical signal input is connected to the first input of the multiplexer 1 and the input of the optoelectric converter 3, and the input of the erbium-doped fiber 2 is the output of the multiplexer 1 and the input of the optoelectric converter 6. , The output of the erbium-doped fiber 2 becomes an optical signal output, the first input of the voltage comparator 8 is connected to the output of the optoelectric converter 6, and the second input of the voltage comparator is monitored and controlled. This voltage comparator 8 is connected to the output of the circuit 5.
Is connected to the input of the pumping light source 4, and the monitoring control circuit 5
Is connected to the output of the optoelectric converter 6 and
Is connected to the second input of the multiplexer 1.
【００１１】次に動作について説明する。Next, the operation will be described.
【００１２】動作は電圧比較器８の基準電圧が一定なら
ば従来技術で説明したようになる。この時ある一定の光
出力が合波器１から出ているがこの光出力を下げたい場
合、光入力信号から電圧比較器８の基準電圧値を下げる
ような信号を送ると、その信号は光電気変換器３で電気
信号に変換され監視制御回路５でその命令を受け電圧比
較器８の基準電圧を下げることになる。この基準電圧が
下がると励起光源４の光出力は下がり合波器１の光出力
も下がることとなり光電気変換器６の出力値が下がり基
準電圧と一致するまで光電気変換器６の光入力値つまり
励起光源４の光出力が下がって安定となる。この監視制
御回路５に命令する信号の種類をあらかじめ設定してお
くと光出力を自由に選ぶことが可能となる。また、逆に
光出力値を上げたい場合には電圧比較器８の基準電圧を
上げる様にすればよい。The operation is as described in the prior art if the reference voltage of the voltage comparator 8 is constant. At this time, a certain constant optical output is output from the multiplexer 1, but if it is desired to reduce this optical output, if a signal that lowers the reference voltage value of the voltage comparator 8 is sent from the optical input signal, that signal will be output. The electric converter 3 converts the electric signal into an electric signal, and the supervisory control circuit 5 receives the command to lower the reference voltage of the voltage comparator 8. When this reference voltage decreases, the optical output of the pumping light source 4 decreases and the optical output of the multiplexer 1 also decreases, so that the output value of the opto-electric converter 6 decreases and the optical input value of the opto-electric converter 6 decreases until it coincides with the reference voltage. That is, the optical output of the excitation light source 4 is lowered and becomes stable. If the type of signal instructing the supervisory control circuit 5 is set in advance, it becomes possible to freely select the optical output. On the contrary, when it is desired to increase the light output value, the reference voltage of the voltage comparator 8 may be increased.
【００１３】次に実施例２について説明する。Next, a second embodiment will be described.
【００１４】図２は本発明の第２の実施例のブロック図
である。光信号入力は合波器１の第１の入力と光電気変
換器３の入力とに接続され、エルビウムドープファイバ
２の入力は合波器１の出力と光減衰器９の第１の入力と
に接続され、エルビウムドープファイバ２の出力は光信
号出力となり、光減衰器９の第２の入力は監視制御回路
５の出力に制御され、この光減衰器９の出力は光電気変
換器６の入力に接続され、この光電気変換器６の出力は
励起光源４の入力に接続され、監視制御回路５の入力は
光電気変換器３の出力に変換され、励起光源４の出力は
合波器１の第２の入力に接続されている。FIG. 2 is a block diagram of the second embodiment of the present invention. The optical signal input is connected to the first input of the multiplexer 1 and the input of the optoelectric converter 3, and the input of the erbium-doped fiber 2 is the output of the multiplexer 1 and the first input of the optical attenuator 9. , The output of the erbium-doped fiber 2 becomes an optical signal output, the second input of the optical attenuator 9 is controlled by the output of the supervisory control circuit 5, and the output of the optical attenuator 9 is output by the optoelectric converter 6. The output of the photoelectric converter 6 is connected to the input of the pumping light source 4, the input of the monitoring control circuit 5 is converted to the output of the photoelectric converter 3, and the output of the pumping light source 4 is connected to the multiplexer. 1 connected to the second input.
【００１５】これも実施例１と同様に合波器１の光出力
を下げたい場合は光減衰器９の減衰量を減らすと光電気
変換器６の出力電圧値は上がるのでそれを下げるために
励起光源４の光出力は下がって高電圧変換器６の出力電
圧値は元の値になる。合波器１の光出力を上げる場合は
光減衰器９の減衰量を増やすとよい。Similarly to the first embodiment, when it is desired to reduce the optical output of the multiplexer 1, if the attenuation amount of the optical attenuator 9 is reduced, the output voltage value of the optoelectric converter 6 rises. The optical output of the pumping light source 4 decreases and the output voltage value of the high voltage converter 6 becomes the original value. When increasing the optical output of the multiplexer 1, the amount of attenuation of the optical attenuator 9 may be increased.
【００１６】[0016]
【発明の効果】以上説明したように本発明は合波器、光
電気変換器、励起光源で閉ループを構成している回路に
監視制御回路から制御可能な電気回路もしくは光回路を
挿入し、外部から監視制御回路に命令を送り電気回路も
しくは光回路を制御することで光信号出力を可変できる
という効果を有する。As described above, according to the present invention, an electric circuit or an optical circuit controllable from a supervisory control circuit is inserted into a circuit forming a closed loop with a multiplexer, an optoelectric converter and an excitation light source, and an external circuit is provided. The optical signal output can be varied by sending an instruction from the monitor control circuit to control the electric circuit or the optical circuit.
【図１】本発明の第１の実施例のブロック図。FIG. 1 is a block diagram of a first embodiment of the present invention.
【図２】本発明の第２の実施例のブロック図。FIG. 2 is a block diagram of a second embodiment of the present invention.
【図３】従来例のブロック図。FIG. 3 is a block diagram of a conventional example.
１ 合波器 ２ エルビウムドープファイバ ３ 光電気変換器 ４ 励起光源 ５ 監視制御回路 ６ 光電気変換器 ７ 光ファイバ増幅器 ８ 電圧比較器 ９ 光減衰器 1 multiplexer 2 erbium-doped fiber 3 photoelectric converter 4 pumping light source 5 supervisory control circuit 6 photoelectric converter 7 optical fiber amplifier 8 voltage comparator 9 optical attenuator
Claims (2)
し、光信号を励起光源の光と共にエルビウムドープファ
イバに入力せしめて光信号を増幅する光ファイバ増幅器
において、光信号入力は合波器の第１の入力と第１の光
電気変換器の入力とに接続され、エルビウムドープファ
イバの入力は前記合波器の出力と第２の光電気変換器の
入力に接続され、該エルビウムドープファイバの出力は
光信号出力となり、電圧比較器の第１の入力は前記第２
の光電気変換器の出力と接続され、該電圧比較器の第２
の入力は監視制御回路の出力に接続され、該電圧比較器
の出力は励起光源の入力に接続され、前記監視制御回路
の入力は前記第１の光電気変換器の出力に接続され、前
記励起光源の出力は前記合波器の第２の入力に接続され
たことを特徴とする光ファイバ増幅器。1. An optical fiber amplifier having a supervisory control circuit for monitoring an optical signal, wherein the optical signal is input to an erbium-doped fiber together with the light of an excitation light source to amplify the optical signal, and the optical signal input is of a multiplexer. An input of the erbium-doped fiber is connected to a first input and an input of the first photoelectric converter, and an input of the erbium-doped fiber is connected to an output of the multiplexer and an input of the second photoelectric converter. The output becomes an optical signal output, and the first input of the voltage comparator is the second
Second output of the voltage comparator connected to the output of the photoelectric converter of
Is connected to the output of the supervisory control circuit, the output of the voltage comparator is connected to the input of the excitation light source, the input of the supervisory control circuit is connected to the output of the first optoelectric converter, and the excitation The optical fiber amplifier, wherein the output of the light source is connected to the second input of the multiplexer.
し、光信号を励起光源の光と共にエルビウムドープファ
イバに入力せしめて、前記光信号を増幅する光ファイバ
増幅器において、光信号入力は合波器の第１の入力と第
１の光電気変換器の入力とに接続され、エルビウムドー
プファイバの入力は前記合波器の出力と光減衰器の第１
の入力とに接続され、該エルビウムドープファイバの出
力は光信号出力となり、前記光減衰器の第２の入力は監
視制御回路の出力に接続され、該光減衰器の出力は第２
の光電気変換器の入力に接続され、該光電気変換器の出
力は励起光源の入力に接続され、前記監視制御回路の入
力は前記第１の光電気変換器の出力に接続され、前記励
起光源の出力は前記励起光源の出力は前記合波器の第２
の入力に接続されたことを特徴とする光ファイバ増幅
器。2. An optical fiber amplifier having a supervisory control circuit for monitoring an optical signal, wherein the optical signal is input together with the light of a pumping light source into an erbium-doped fiber, and the optical signal is amplified. A first input of the multiplexer and an input of the first opto-electrical converter, the input of the erbium-doped fiber being the output of the multiplexer and the first of the optical attenuators.
, The output of the erbium-doped fiber is an optical signal output, the second input of the optical attenuator is connected to the output of the supervisory control circuit, and the output of the optical attenuator is the second
Connected to the input of the opto-electrical converter, the output of the opto-electrical converter is connected to the input of the excitation light source, the input of the supervisory control circuit is connected to the output of the first opto-electrical converter, The output of the light source is the output of the excitation light source and is the second output of the multiplexer.
An optical fiber amplifier connected to the input of the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12151492A JPH05315692A (en) | 1992-05-14 | 1992-05-14 | Optical fiber amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12151492A JPH05315692A (en) | 1992-05-14 | 1992-05-14 | Optical fiber amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05315692A true JPH05315692A (en) | 1993-11-26 |
Family
ID=14813094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12151492A Withdrawn JPH05315692A (en) | 1992-05-14 | 1992-05-14 | Optical fiber amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05315692A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6442309B1 (en) | 1998-11-11 | 2002-08-27 | Nec Corporation | Optical amplifier |
-
1992
- 1992-05-14 JP JP12151492A patent/JPH05315692A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6442309B1 (en) | 1998-11-11 | 2002-08-27 | Nec Corporation | Optical amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990803 |