JPH07109910B2 - Laser driving circuit for pumping optical fiber amplifier with switching function - Google Patents
Laser driving circuit for pumping optical fiber amplifier with switching functionInfo
- Publication number
- JPH07109910B2 JPH07109910B2 JP3189093A JP18909391A JPH07109910B2 JP H07109910 B2 JPH07109910 B2 JP H07109910B2 JP 3189093 A JP3189093 A JP 3189093A JP 18909391 A JP18909391 A JP 18909391A JP H07109910 B2 JPH07109910 B2 JP H07109910B2
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- field effect
- effect transistor
- laser
- optical fiber
- 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
Landscapes
- Lasers (AREA)
- Electronic Switches (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、希土類添加ファイバを
用いた光ファイバ増幅器に関し、特に、励起用レーザの
駆動回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber amplifier using a rare earth-doped fiber, and more particularly to a driving circuit for a pumping laser.
【０００２】[0002]
【従来の技術】光ファイバ増幅器の励起用レーザは、シ
ステムの信頼性を高めるため、現用の励起用レーザの他
に、予備の励起用レーザを備える必要があった。そし
て、現用の励起用レーザから予備の励起用レーザへの切
り替えは、図３に示すように、駆動回路ごと切り替えて
いた。2. Description of the Related Art The pumping laser of an optical fiber amplifier has to be equipped with a spare pumping laser in addition to the current pumping laser in order to improve system reliability. Then, the switching from the current pumping laser to the backup pumping laser is switched for each drive circuit as shown in FIG.
【０００３】[0003]
【発明が解決しようとする課題】この従来の切り替え方
法では、切り替え時に、光出力の瞬断がさけられず、ま
た、励起用レーザが高出力のため、突入電流による電源
への影響を無視できないという問題点があった。In this conventional switching method, the instantaneous interruption of the optical output is not avoided at the time of switching, and since the pumping laser has a high output, the influence of the inrush current on the power supply cannot be ignored. There was a problem.
【０００４】本発明の目的は、切り替え時に、光出力の
瞬断がないようにし、また、突入電流を防止することに
ある。An object of the present invention is to prevent instantaneous interruption of light output at the time of switching and to prevent inrush current.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、希土類添加ファイバを用いた光ファイバ
増幅器の励起用レーザの駆動回路において、エミッタが
互いに接続された第１のトランジスタ及び第２のトラン
ジスタのエミッタに定電流源を接続して構成される電流
切替型スイッチの第１のトランジスタのコレクタに第１
の励起用レーザを接続し、第２のトランジスタのコレク
タに第２の励起用レーザを接続し、第２のトランジスタ
のベースに基準電圧を加え、第１のトランジスタのベー
スに基準電圧よりも小さい電圧を加えたとき、第１のト
ランジスタを導通させ、第２のトランジスタを遮断状態
にさせ、第１のトランジスタのベースに基準電圧よりも
大きい電圧を加えたとき、第２のトランジスタを導通さ
せ、第１のトランジスタを遮断状態にさせるようにした
ものである。In order to achieve the above object, the present invention provides a first transistor having emitters connected to each other in a drive circuit of a pumping laser of an optical fiber amplifier using a rare earth-doped fiber, and Second tran
A first transistor is formed on the collector of the first transistor of the current changeover switch which is formed by connecting a constant current source to the emitter of the transistor.
Of connecting the excitation laser, the second excitation laser connected to the collector of the second transistor, the second transistor
A reference voltage is applied to the base of the
When a voltage lower than the reference voltage is applied to the
Conducting the transistor and shutting off the second transistor
Than the reference voltage at the base of the first transistor
When a large voltage is applied, the second transistor is turned on.
The first transistor is turned off .
【０００６】また、上記目的を達成するために、本発明
は、希土類添加ファイバを用いた光ファイバ増幅器の励
起用レーザの駆動回路において、ソースが互いに接続さ
れた第１の電界効果トランジスタ及び第２の電界効果ト
ランジスタのソースに定電流源を接続して構成される電
流切替型スイッチの第１の電界効果トランジスタのドレ
インに第１の励起用レーザを接続し、第２の電界効果ト
ランジスタのドレインに第２の励起用レーザを接続し、
第２の電界効果トランジスタのゲートに基準電圧を加
え、第１の電界効果トランジスタのゲートに基準電圧よ
りも小さい電圧を加えたとき、第１の電界効果トランジ
スタを導通させ、第２の電界効果トランジスタを遮断状
態にさせ、第１の電界効果トランジスタのゲートに基準
電圧よりも大きい電圧を加えたとき、第２の電界効果ト
ランジスタを導通させ、第１の電界効果トランジスタを
遮断状態にさせるようにしたものである。In order to achieve the above-mentioned object, the present invention provides a first field-effect transistor and a second field-effect transistor having sources connected to each other in a drive circuit of a pumping laser of an optical fiber amplifier using a rare earth-doped fiber . The field effect of
A first excitation laser connected to the first drain of the field effect transistor sources to a constant current source current switching type switch configured by connecting a transistor, a second drain of the second field effect transistor Connect the excitation laser,
A reference voltage is applied to the gate of the second field effect transistor.
The reference voltage is applied to the gate of the first field effect transistor.
The first field-effect transistor
The second field effect transistor is turned off.
The gate of the first field effect transistor.
When a voltage larger than the voltage is applied, the second field effect transistor
Conduct the transistor and connect the first field effect transistor
It is designed to be in a cutoff state .
【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。Next, the present invention will be described with reference to the drawings.
【０００８】図１は本発明の一実施例を示す図である。
図２は本発明の一実施例に用いられる励起用レーザの駆
動電流の切替特性である。FIG. 1 is a diagram showing an embodiment of the present invention.
FIG. 2 shows the switching characteristics of the drive current of the pumping laser used in the embodiment of the present invention.
【０００９】図１において、光パルスデータ信号を増幅
する希土類添加ファイバは、通常、第１の励起用レーザ
１又は第２の励起用レーザ２のいずれか一方で駆動され
ている。In FIG. 1, the rare earth-doped fiber for amplifying the optical pulse data signal is usually driven by either the first pumping laser 1 or the second pumping laser 2.
【００１０】第１の励起用レーザ１は、第１のトランジ
スタ３により駆動され、第２の励起用レーザ２は、第２
のトランジスタ４により駆動される。第１のトランジス
タ３と第２のトランジスタ４のエミッタは、互いに接続
され、定電流源５により駆動される。The first pumping laser 1 is driven by the first transistor 3, and the second pumping laser 2 is driven by the second transistor 3.
Driven by the transistor 4. The emitters of the first transistor 3 and the second transistor 4 are connected to each other and driven by the constant current source 5.
【００１１】駆動電流切替制御回路の制御信号電圧Ｖ
が、基準電圧よりも小さい電圧Ｖ1 のとき、第１のトラ
ンジスタ３が導通し、第２のトランジスタ４が遮断状態
となるので、定電流源５の電流Ｉは、第１の励起用レー
ザ１に流れる。また、駆動電流切替制御回路の制御信号
電圧Ｖが、基準電圧よりも大きい電圧Ｖ2 のとき、第２
のトランジスタ４が導通し、第１のトランジスタ３が遮
断状態となるので、定電流源５の電流は、第２の励起用
レーザ２に流れる。さらに、駆動電流切替制御回路の制
御信号電圧Ｖが、基準電圧の近傍のとき、第１のトラン
ジスタ３と第２のトランジスタ４は、ともに導通し、第
１の励起用レーザ１と第２の励起用レーザ２の両方に電
流が流れるが、その総和は定電流源５の電流Ｉに保たれ
る。以上の状態を図２に示す。Control signal voltage V of the drive current switching control circuit
However, when the voltage V 1 is smaller than the reference voltage, the first transistor 3 is turned on and the second transistor 4 is turned off. Therefore, the current I of the constant current source 5 is the first pumping laser 1 Flow to. When the control signal voltage V of the drive current switching control circuit is a voltage V 2 larger than the reference voltage, the second
Since the transistor 4 is turned on and the first transistor 3 is turned off, the current of the constant current source 5 flows to the second excitation laser 2. Further, when the control signal voltage V of the drive current switching control circuit is in the vicinity of the reference voltage, both the first transistor 3 and the second transistor 4 become conductive, and the first pump laser 1 and the second pump laser 2 are turned on. A current flows through both of the lasers 2 for use, but the total sum is kept at the current I of the constant current source 5. The above state is shown in FIG.
【００１２】以上の説明から明らかなように、第１の励
起用レーザ１から第２の励起用レーザ２に切り替える際
に、無瞬断で切り替えることができ、各励起用レーザの
特性が揃っている場合には、光出力も一定値に保たれ
る。また、切り替えのときに、突入電流が流れることも
ない。As is clear from the above description, when switching from the first pumping laser 1 to the second pumping laser 2, it is possible to switch without interruption, and the characteristics of each pumping laser are uniform. If so, the light output is also kept constant. In addition, no rush current flows when switching.
【００１３】なお、本発明の一実施例においては、バイ
ポーラトランジスタを用いているが、バイポーラトラン
ジスタの代わりに電界効果トランジスタを用いることも
できる。Although the bipolar transistor is used in the embodiment of the present invention, a field effect transistor may be used instead of the bipolar transistor.
【００１４】[0014]
【発明の効果】以上説明したように、本発明は、エミッ
タが互いに接続された２つのトランジスタのエミッタに
定電流源を接続して電流切替型スイッチを構成したの
で、切り替え時の電流の瞬断がなく、光出力の瞬断がな
いという効果が得られる。また、切り替え時、突入電流
を防止するという効果も得られる。As described above, according to the present invention, a constant current source is connected to the emitters of two transistors whose emitters are connected to each other to form a current changeover switch. And the effect that there is no interruption of the optical output is obtained. Further, an effect of preventing an inrush current can be obtained at the time of switching.
【図１】本発明の一実施例を示す図である。FIG. 1 is a diagram showing an embodiment of the present invention.
【図２】本発明の一実施例に用いられる励起用レーザの
駆動電流の切替特性を示す図である。FIG. 2 is a diagram showing a switching characteristic of a drive current of an excitation laser used in an embodiment of the present invention.
【図３】従来の光ファイバ増幅器の励起用レーザの駆動
回路を示す図である。FIG. 3 is a diagram showing a drive circuit of a pumping laser of a conventional optical fiber amplifier.
１ 第１の励起用レーザ ２ 第２の励起用レーザ ３ 第１のトランジスタ ４ 第２のトランジスタ ５ 定電流源 1 First Excitation Laser 2 Second Excitation Laser 3 First Transistor 4 Second Transistor 5 Constant Current Source
Claims (2)
幅器の励起用レーザの駆動回路において、エミッタが互
いに接続された第１のトランジスタ及び第２のトランジ
スタのエミッタに定電流源を接続して構成される電流切
替型スイッチの第１のトランジスタのコレクタに第１の
励起用レーザを接続し、第２のトランジスタのコレクタ
に第２の励起用レーザを接続し、第２のトランジスタの
ベースに基準電圧を加え、第１のトランジスタのベース
に基準電圧よりも小さい電圧を加えたとき、第１のトラ
ンジスタを導通させ、第２のトランジスタを遮断状態に
させ、第１のトランジスタのベースに基準電圧よりも大
きい電圧を加えたとき、第２のトランジスタを導通さ
せ、第１のトランジスタを遮断状態にさせることを特徴
とする切替機能を有する光ファイバ増幅器励起用レーザ
駆動回路。1. A driving circuit of a pumping laser for an optical fiber amplifier using a rare earth-doped fiber, wherein a first transistor and a second transistor whose emitters are connected to each other.
Connect the constant current source to the emitters of the static first excitation laser connected to the collector of the first transistor of the current switching type switch configured by, a second pumping laser to the collector of the second transistor Connect the second transistor
A reference voltage is applied to the base, and the base of the first transistor
When a voltage lower than the reference voltage is applied to the
Turn on the transistor and turn off the second transistor.
And the base of the first transistor is higher than the reference voltage.
When a threshold voltage is applied, the second transistor is turned on.
A laser drive circuit for pumping an optical fiber amplifier having a switching function, characterized in that the first transistor is turned off .
幅器の励起用レーザの駆動回路において、ソースが互い
に接続された第１の電界効果トランジスタ及び第２の電
界効果トランジスタのソースに定電流源を接続して構成
される電流切替型スイッチの第１の電界効果トランジス
タのドレインに第１の励起用レーザを接続し、第２の電
界効果トランジスタのドレインに第２の励起用レーザを
接続し、第２の電界効果トランジスタのゲートに基準電
圧を加え、第１の電界効果トランジスタのゲートに基準
電圧よりも小さい電圧を加えたとき、第１の電界効果ト
ランジスタを導通させ、第２の電界効果トランジスタを
遮断状態にさせ、第１の電界効果トランジスタのゲート
に基準電圧よりも大きい電圧を加えたとき、第２の電界
効果トランジスタを導通させ、第１の電界効果トランジ
スタを遮断状態にさせることを特徴とする切替機能を有
する光ファイバ増幅器励起用レーザ駆動回路。2. A drive circuit of a pumping laser for an optical fiber amplifier using a rare earth-doped fiber, wherein a first field effect transistor and a second electric field source whose sources are connected to each other are provided.
Connecting a first pumping laser to the drain of the first field effect transistor of the current switching type switch configured by connecting a constant current source to the source of the field effect transistor, the drain of the second field effect transistor The second excitation laser is connected and the reference voltage is applied to the gate of the second field effect transistor.
Apply pressure to the gate of the first field effect transistor
When a voltage smaller than the voltage is applied, the first field effect transistor
Turn on the transistor and connect the second field effect transistor
Gate of first field effect transistor in cut-off state
When a voltage higher than the reference voltage is applied to the
The effect transistor is turned on and the first field effect transistor is turned on.
A laser drive circuit for pumping an optical fiber amplifier having a switching function, which is characterized in that a star is turned off .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3189093A JPH07109910B2 (en) | 1991-07-30 | 1991-07-30 | Laser driving circuit for pumping optical fiber amplifier with switching function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3189093A JPH07109910B2 (en) | 1991-07-30 | 1991-07-30 | Laser driving circuit for pumping optical fiber amplifier with switching function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0541552A JPH0541552A (en) | 1993-02-19 |
| JPH07109910B2 true JPH07109910B2 (en) | 1995-11-22 |
Family
ID=16235222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3189093A Expired - Lifetime JPH07109910B2 (en) | 1991-07-30 | 1991-07-30 | Laser driving circuit for pumping optical fiber amplifier with switching function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07109910B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07240551A (en) * | 1994-03-02 | 1995-09-12 | Fujitsu Ltd | Prevention system of surge light generation in optical amplification and transmission apparatus |
| WO2014034073A1 (en) * | 2012-08-28 | 2014-03-06 | 日本電気株式会社 | Excitation light source for optical amplifier and method for controlling excitation light source for optical amplifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH043029A (en) * | 1990-04-20 | 1992-01-08 | Fujitsu Ltd | Method for driving pumping light source for optical amplification |
-
1991
- 1991-07-30 JP JP3189093A patent/JPH07109910B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0541552A (en) | 1993-02-19 |
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