JPH06283790A - Bidirectional pumping light amplifier - Google Patents

Bidirectional pumping light amplifier

Info

Publication number
JPH06283790A
JPH06283790A JP5068647A JP6864793A JPH06283790A JP H06283790 A JPH06283790 A JP H06283790A JP 5068647 A JP5068647 A JP 5068647A JP 6864793 A JP6864793 A JP 6864793A JP H06283790 A JPH06283790 A JP H06283790A
Authority
JP
Japan
Prior art keywords
pumping
active element
optical
fiber
doped 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.)
Pending
Application number
JP5068647A
Other languages
Japanese (ja)
Inventor
Minoru Taya
実 田家
Kazuo Kamiya
和雄 神屋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shin Etsu Chemical Co Ltd
Original Assignee
Shin Etsu Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shin Etsu Chemical Co Ltd filed Critical Shin Etsu Chemical Co Ltd
Priority to JP5068647A priority Critical patent/JPH06283790A/en
Publication of JPH06283790A publication Critical patent/JPH06283790A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
    • H01S3/094011—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre with bidirectional pumping, i.e. with injection of the pump light from both two ends of the fibre

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To allow bidirectional pumping with only one pumping beam source by dividing a pumping beam from the single pumping beam source into two beams so as to input the beams into the incident side and outgoing side. CONSTITUTION:A pumping beam source 13 is permitted to emit by the drive of a driving power source circuit 14, the pumping beam from the pumping beam source 13 are separated by an optical multiplexer/demultiplexer 15 and are projected on the both edges of active element doped fiber 1 through an optical multiplexer/demultiplexer 16 and an optical multiplexer/demultiplexer 17. The signal beam directed to the incident side signal beam transmitting fiber 2 is amplified by the stimulated emission of the active element excited by the pumping beam projected in both directions while passing through the active element doped fiber 1, and the amplified beams are directed to outgoing side signal beam transmitting fiber 3. Thus, bidirectional excitation is allowed by operating only one pumping beam source 13, only single driving power source circuit 14 is necessitated for the pumping power source and the light amplifier is made compact at low cost.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、光通信の分野において
利用される光増幅器であって、励起光を活性元素ドープ
光ファイバの両端から入射させて増幅をする双方向励起
型光増幅器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical amplifier used in the field of optical communication, and relates to a bidirectional pumping optical amplifier for injecting pumping light from both ends of an active element-doped optical fiber for amplification. Is.

【０００２】[0002]

【従来の技術】光通信システムにおいて、長距離伝送に
よって減衰した光信号の増幅は、従来、光信号を一旦電
気信号に変換して電気的増幅をした後、再度光信号に変
換する方法が実施されている。しかしながらこのような
方法では、高速性が求められる多重通信の中継には自ら
制限があるうえ、システムが複雑になるという問題があ
り、最近では光信号を電気信号に変換することなく直接
光信号を増幅することのできる光増幅器が利用されつつ
ある。光増幅器は、光ファイバのコア部にＥｒなどの活
性元素をドープした光ファイバを通過する信号光が、前
記信号光とともに前記活性元素ドープ光ファイバに入射
された励起光により励起した活性元素の誘導放出により
直接増幅されるものである。活性元素としてＥｒをドー
プした光ファイバを使用した光増幅器は１．５５μｍ帯
光通信用の光増幅に適しており、すでに実用化されつつ
ある。また、１．３μｍ帯光通信用の光増幅については
ＮｄやＰｒをドープした光ファイバが注目されている。2. Description of the Related Art In an optical communication system, amplification of an optical signal attenuated by long-distance transmission is conventionally carried out by converting an optical signal into an electric signal, electrically amplifying the electric signal, and then converting the electric signal again. Has been done. However, in such a method, there is a problem in that the relay of multiplex communication, which requires high speed, is limited by itself, and the system becomes complicated. Recently, it is possible to directly transmit an optical signal without converting the optical signal into an electric signal. Optical amplifiers that can amplify are being used. The optical amplifier induces an active element in which a signal light passing through an optical fiber in which an active element such as Er is doped in a core portion of the optical fiber is excited by pumping light incident on the active element-doped optical fiber together with the signal light. It is directly amplified by emission. An optical amplifier using an optical fiber doped with Er as an active element is suitable for optical amplification for 1.55 μm band optical communication and is already in practical use. Further, for optical amplification for 1.3 μm band optical communication, attention is paid to an optical fiber doped with Nd or Pr.

【０００３】光増幅器の主要構成部品としては、活性元
素をドープした光ファイバのほかに、活性元素を励起す
るための励起用光源、およびその励起用光源を駆動する
ための電源回路、励起用光源からの励起光を活性元素ド
ープファイバに入射させるための光合分波器、励起光あ
るいは信号光の反射光を除去するための光アイソレータ
などがある。活性元素ドープファイバへの励起光の入射
方向としては、信号光の活性元素ドープファイバへの入
射側から励起する前方向励起、出射側から励起する後方
向励起、入射側と出射側の双方から励起する双方向励起
があり、それぞれ光増幅器の使用目的に応じて、使い分
けることができる。The main components of an optical amplifier are, in addition to an optical fiber doped with an active element, a pumping light source for pumping the active element, a power supply circuit for driving the pumping light source, and a pumping light source. There is an optical multiplexer / demultiplexer for making the pumping light from the optical element incident on the active element-doped fiber, and an optical isolator for removing the reflected light of the pumping light or the signal light. The incident direction of the pumping light to the active element-doped fiber is as follows: frontward pumping that excites the signal light from the incident side to the active element-doped fiber, rearward pumping that pumps from the exit side, and pumping from both the incident side and the exit side. There is bidirectional pumping, which can be used properly according to the purpose of use of the optical amplifier.

【０００４】双方向励起型の光増幅器は、図５に示して
あるように、入射側の信号光伝送用ファイバ２から出射
側の信号光伝送用ファイバ３に至る中間に挿入されるも
のである。信号光伝送用ファイバ２は光アイソレータ４
を介して光合分波器１６の第１の入力ポートに接続され
ている。光合分波器１６の第２の入力ポートには、光ア
イソレータ６を介して励起用光源８が接続される。光合
分波器１６の出力ポートには所定の長さの活性元素ドー
プファイバ１が接続され、さらに活性元素ドープファイ
バ１には光合分波器１７が接続される。光合分波器１７
の信号光出力側に分岐した一方は光アイソレータ７を介
して励起用光源１０に結合し、他方は光アイソレータ５
を介して出射側の信号光伝送用ファイバ３に接続されて
いる。励起用光源８は駆動電源回路９に連結され、励起
用光源１０は駆動電源回路１１に連結される。As shown in FIG. 5, the bidirectional pumping type optical amplifier is inserted in the middle from the signal light transmitting fiber 2 on the incident side to the signal light transmitting fiber 3 on the emitting side. . The signal light transmission fiber 2 is an optical isolator 4
Is connected to the first input port of the optical multiplexer / demultiplexer 16. The pumping light source 8 is connected to the second input port of the optical multiplexer / demultiplexer 16 via the optical isolator 6. An active element-doped fiber 1 having a predetermined length is connected to the output port of the optical multiplexer / demultiplexer 16, and an optical multiplexer / demultiplexer 17 is further connected to the active element-doped fiber 1. Optical multiplexer / demultiplexer 17
One of the two branches to the signal light output side is coupled to the pumping light source 10 via the optical isolator 7, and the other is coupled to the optical isolator 5
It is connected to the signal light transmission fiber 3 on the output side via. The excitation light source 8 is connected to the drive power supply circuit 9, and the excitation light source 10 is connected to the drive power supply circuit 11.

【０００５】活性元素ドープファイバ１には励起用光源
８からの励起光と励起用光源１０からの励起光が入射す
る。いわゆる双方向励起型と呼ばれる所以である。入射
側の信号光伝送用ファイバ２から入射した信号光は、活
性元素ドープファイバ１を通過する間、双方向から入射
した励起光によって励起した活性元素の誘導放射により
増幅され出射側の信号光伝送用ファイバ３に出射してゆ
く。Excitation light from the excitation light source 8 and excitation light from the excitation light source 10 enter the active element-doped fiber 1. This is why it is so-called bidirectional excitation type. The signal light incident from the signal light transmission fiber 2 on the incident side is amplified by the stimulated emission of the active element excited by the excitation light incident from both directions while passing through the active element-doped fiber 1, and the signal light transmission on the emission side. It is emitted to the optical fiber 3.

【０００６】[0006]

【発明が解決しようとする課題】従来の双方向励起型の
光増幅器は、双方向から励起光を入射させるため、２つ
の励起用光源８および１０を必要とし、そのための駆動
電源回路も２つ必要となっている。そのため光増幅器が
大きなものになってしまい、またコストが増大するとい
った問題があった。本発明はこのような問題点を解消
し、小型で安価な双方向励起型の光増幅器を提供するも
のである。A conventional bidirectional pumping type optical amplifier requires two pumping light sources 8 and 10 in order to enter pumping light from both directions, and two driving power supply circuits for that purpose. Is needed. Therefore, there is a problem that the optical amplifier becomes large and the cost increases. The present invention solves such a problem and provides a small-sized and inexpensive bidirectional pumping type optical amplifier.

【０００７】[0007]

【課題を解決するための手段】この目的を達成するため
の本発明の双方向励起型光増幅器は、実施例に対応する
図１に示すように、励起用光源１３からの励起光を、入
射側の信号光伝送用ファイバ２と出射側の信号光伝送用
ファイバ３との中間に接続される活性元素ドープファイ
バ１の入射側と出射側の双方から導入させて、活性元素
ドープファイバ１中で活性元素の誘導放出光により信号
光を増幅する双方向励起型光増幅器において、単一の励
起用光源１３からの励起光を分割する光学手段１５を有
し、該光学手段１５により分割した励起光の一方を活性
元素ドープファイバ１の入射側に光学的に接続し、もう
一方を活性元素ドープファイバ１の出射側に光学的に接
続し、活性元素ドープファイバ１の入射側および出射側
の双方から励起光を導入させることを特徴とする。A bidirectional pumping optical amplifier according to the present invention for achieving this object, as shown in FIG. 1 corresponding to an embodiment, makes pumping light from a pumping light source 13 incident. Of the active element-doped fiber 1 which is connected between the signal light transmitting fiber 2 on the side of the optical fiber and the fiber 3 for signal light on the emitting side of the active element-doped fiber 1 A bidirectional pumping optical amplifier for amplifying signal light by stimulated emission light of an active element has an optical means 15 for splitting pumping light from a single pumping light source 13, and pumping light split by the optical means 15. One is optically connected to the incident side of the active element-doped fiber 1 and the other is optically connected to the emission side of the active element-doped fiber 1 from both the incident side and the emission side of the active element-doped fiber 1. Excitation light Characterized in that to introduce.

【０００８】励起光を分割する光学手段１５は、具体的
には例えば光ファイバ合分波器である。前記した励起光
を分割する光学手段の別な例は、レーザービームスプリ
ッタ２１である（図３参照）。The optical means 15 for splitting the excitation light is, for example, an optical fiber multiplexer / demultiplexer. Another example of the optical means that splits the excitation light is the laser beam splitter 21 (see FIG. 3).

【０００９】前記目的を達成するための本発明の双方向
励起型光増幅器の別な態様は、実施例に対応する図４に
示すように、励起用光源１３から励起光を、入射側の信
号光伝送用ファイバ２と出射側の信号光伝送用ファイバ
３との中間に接続される活性元素ドープファイバ１の入
射側と出射側の双方から導入させて、活性元素ドープフ
ァイバ１中で活性元素の誘導放出光により信号光を増幅
する双方向励起型光増幅器において、単一の駆動電源回
路１４に切換回路２０を介して複数の励起用光源１８・
１９が接続しており、複数の励起用光源１８・１９は夫
々光合分波器22の第１の入力ポートおよび第２の入力ポ
ートに接続され、光合分波器２２の第１の出力ポートを
活性元素ドープファイバ１の入射側に光学的に接続し、
第２の出力ポートを活性元素ドープファイバ１の出社側
に光学的に接続し、活性元素ドープファイバ１の入射側
および出射側の双方から励起光を導入させることを特徴
とする。Another aspect of the bidirectional pumping type optical amplifier of the present invention for achieving the above object is, as shown in FIG. 4 corresponding to the embodiment, pumping light from a pumping light source 13 to a signal on the incident side. The active element-doped fiber 1 is introduced from both the incident side and the emission side of the active element-doped fiber 1 connected between the optical transmission fiber 2 and the signal-side optical transmission fiber 3 on the emission side, and the active element-doped fiber 1 In a bidirectional pumping optical amplifier that amplifies signal light by stimulated emission light, a plurality of pumping light sources 18 via a switching circuit 20 in a single drive power supply circuit 14
19, a plurality of pumping light sources 18 and 19 are respectively connected to the first input port and the second input port of the optical multiplexer / demultiplexer 22, and the first output port of the optical multiplexer / demultiplexer 22 is connected. Optically connected to the incident side of the active element-doped fiber 1,
The second output port is optically connected to the office side of the active element-doped fiber 1, and the excitation light is introduced from both the incident side and the exit side of the active element-doped fiber 1.

【００１０】[0010]

【作用】上記のように双方向励起型光増幅器の励起用光
源１３（または励起用光源１８・１９）から活性元素ド
ープファイバ１の入射側および出射側の双方に至る光路
中に励起光を分割する光学手段１５（または光ファイバ
合分波器２２）を挿入しているため、動作させる励起用
光源１つだけで双方向励起が実現できる。そのため励起
用光源の駆動電源回路１４は単独ですむことになる。As described above, the pumping light is split into the optical paths from the pumping light source 13 (or the pumping light sources 18 and 19) of the bidirectional pumping optical amplifier to both the incident side and the outgoing side of the active element-doped fiber 1. Since the optical means 15 (or the optical fiber multiplexer / demultiplexer 22) is inserted, bidirectional pumping can be realized with only one pumping light source to be operated. Therefore, the drive power supply circuit 14 for the excitation light source may be independent.

【００１１】[0011]

【実施例】以下、本発明の実施例を図面により詳細に説
明する。図１は本発明を適用する双方向励起型光増幅器
の実施例のブロック図である。同図に示す光増幅器は、
双方向励起の光増幅器であり入射側の信号光伝送用ファ
イバ２から出射側の信号光伝送用ファイバ３に至る途中
に挿入されるものである。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a bidirectional pumping optical amplifier to which the present invention is applied. The optical amplifier shown in FIG.
It is a bidirectional pumping optical amplifier and is inserted in the way from the incident side signal light transmission fiber 2 to the emission side signal light transmission fiber 3.

【００１２】入射側の信号光伝送用ファイバ２は光アイ
ソレータ４を介して光合分波器１６の第１の入力ポート
に接続される。光合分波器１６の第２の入力ポートには
光アイソレータ６を介して光合分波器１５の第１の出力
ポートに接続される。The signal light transmission fiber 2 on the incident side is connected to the first input port of the optical multiplexer / demultiplexer 16 via the optical isolator 4. The second input port of the optical multiplexer / demultiplexer 16 is connected to the first output port of the optical multiplexer / demultiplexer 15 via the optical isolator 6.

【００１３】出射側の信号光伝送用ファイバ３は光アイ
ソレータ５を介して光合分波器１７の第１の入力ポート
に接続され、光合分波器１７の第２の出力ポートは光ア
イソレータ７を介して光合分波器１５の第２の出力ポー
トに接続される。光合分波器１６の信号光出力ポートお
よび光合分波器１７の信号光入力ポートは、所定の長さ
でコイル状に巻かれた活性元素ドープファイバ１の両端
に夫々接続されている。光合分波器１５の入力ポートは
励起用光源１３に接続され、励起用光源１３は駆動電源
回路１４に連結される。The signal-side optical transmission fiber 3 on the output side is connected to the first input port of the optical multiplexer / demultiplexer 17 via the optical isolator 5, and the second output port of the optical multiplexer / demultiplexer 17 connects the optical isolator 7. It is connected to the second output port of the optical multiplexer / demultiplexer 15 via. The signal light output port of the optical multiplexer / demultiplexer 16 and the signal light input port of the optical multiplexer / demultiplexer 17 are connected to both ends of the active element-doped fiber 1 wound in a coil shape with a predetermined length. The input port of the optical multiplexer / demultiplexer 15 is connected to the excitation light source 13, and the excitation light source 13 is connected to the drive power supply circuit 14.

【００１４】駆動電源回路１４の駆動により励起用光源
１３が発光し、励起用光源１３からの励起光は光合分波
器１５で分割され、夫々光合分波器１６および光合分波
器17を経て活性元素ドープファイバ１に両端双方から入
射する。入射側の信号光伝送用ファイバ２から入射した
信号光は、活性元素ドープファイバ１を通過する間、双
方向から入射した励起光よって励起した活性元素の誘導
放射により増幅され、出射側の信号光伝送用ファイバ３
に出射してゆく。The excitation light source 13 emits light when driven by the drive power supply circuit 14, the excitation light from the excitation light source 13 is split by the optical multiplexer / demultiplexer 15, and passes through the optical multiplexer / demultiplexer 16 and the optical multiplexer / demultiplexer 17, respectively. It is incident on the active element-doped fiber 1 from both ends. The signal light incident from the signal light transmitting fiber 2 on the incident side is amplified by the stimulated emission of the active element excited by the excitation light incident from both directions while passing through the active element-doped fiber 1, and the signal light on the emitting side is amplified. Transmission fiber 3
It goes out to.

【００１５】図２は本発明を適用する双方向励起型光増
幅器の別な実施例である。同図に示す光増幅器は、図１
に示した光合分波器１５と光合分波器１６および１７と
の間に夫々光アイソレータ６および７を接続する代わり
に、光アイソレータ６を励起用光源１３と光合分波器１
５の間に接続したものである。その他の構成は、図１に
示す双方向励起型光増幅器と同一である。FIG. 2 shows another embodiment of the bidirectional pumping type optical amplifier to which the present invention is applied. The optical amplifier shown in FIG.
Instead of connecting the optical isolators 6 and 7 between the optical multiplexer / demultiplexer 15 and the optical multiplexers / demultiplexers 16 and 17, respectively, the optical isolator 6 is connected to the pumping light source 13 and the optical multiplexer / demultiplexer 1.
It is connected between 5. Other configurations are the same as those of the bidirectional pumping type optical amplifier shown in FIG.

【００１６】図３も本発明を適用する双方向励起型光増
幅器の別な実施例である。同図に示す光増幅器は、励起
用光源１３からの励起光を分割する光学手段がレーザー
ビームスプリッタ２１である。その他の構成は、図１に
示す双方向励起型光増幅器と同一である。FIG. 3 also shows another embodiment of the bidirectional pumping optical amplifier to which the present invention is applied. In the optical amplifier shown in the figure, the optical means for splitting the pumping light from the pumping light source 13 is the laser beam splitter 21. Other configurations are the same as those of the bidirectional pumping type optical amplifier shown in FIG.

【００１７】図４は本発明を適用する別な態様の双方向
励起型光増幅器の実施例である。この図に示す光増幅器
は、入射側の信号光伝送用ファイバ２が光アイソレータ
４を介して光合分波器１６の第１の入力ポートに接続さ
れる。光合分波器１６の第２の入力ポートには光アイソ
レータ６を介して光合分波器２２の第１の出力ポートに
接続される。出射側の信号光伝送用ファイバ３は光アイ
ソレータ５を介して光合分波器１７の第１の出力ポート
に続され、光合分波器１７の第２の出力ポートには光ア
イソレータ７を介して光合分波器２２の第２の出力ポー
トに接続される。光合分波器２２の第１の入力ポートに
は励起用光源１８が接続され、第２の入力ポートには励
起用光源１９が接続される。励起用光源１８および励起
用光源19は切換スイッチ２０を介して駆動電源回路１４
に連結される。FIG. 4 shows an embodiment of a bidirectional pumping type optical amplifier of another mode to which the present invention is applied. In the optical amplifier shown in this figure, a signal light transmission fiber 2 on the incident side is connected to a first input port of an optical multiplexer / demultiplexer 16 via an optical isolator 4. The second input port of the optical multiplexer / demultiplexer 16 is connected to the first output port of the optical multiplexer / demultiplexer 22 via the optical isolator 6. The signal-side optical transmission fiber 3 on the output side is connected to the first output port of the optical multiplexer / demultiplexer 17 via the optical isolator 5, and is connected to the second output port of the optical multiplexer / demultiplexer 17 via the optical isolator 7. It is connected to the second output port of the optical multiplexer / demultiplexer 22. The light source 18 for excitation is connected to the 1st input port of the optical multiplexer / demultiplexer 22, and the light source 19 for excitation is connected to the 2nd input port. The excitation light source 18 and the excitation light source 19 are connected to the drive power supply circuit 14 via the changeover switch 20.
Connected to.

【００１８】図示のように切換スイッチ２０が励起用光
源１８側に接続しているとき、駆動電源回路１４の駆動
により励起用光源１８が発光し、励起光は光合分波器２
２で分割され、夫々光合分波器１６および光合分波器１
７を経て活性元素ドープファイバ１に両端双方から入射
する。入射側の信号光伝送用ファイバ２から入射した信
号光は、活性元素ドープファイバ１を通過する間、双方
向から入射した励起光によって励起した活性元素の誘導
放出により増幅され、出射側の信号光伝送用ファイバ３
へ出射してゆく。励起用光源１８が不調のときには、直
ちに切換スイッチ２０を励起用光源１９側に切換え、障
害なく通信を続けることができる。As shown in the figure, when the changeover switch 20 is connected to the pumping light source 18 side, the pumping light source 18 emits light by driving the driving power supply circuit 14, and the pumping light is the optical multiplexer / demultiplexer 2.
Optical multiplexer / demultiplexer 16 and optical multiplexer / demultiplexer 1 respectively.
After passing through 7, the light enters the active element-doped fiber 1 from both ends. The signal light incident from the signal light transmitting fiber 2 on the incident side is amplified by the stimulated emission of the active element excited by the excitation light incident from both directions while passing through the active element-doped fiber 1, and the signal light on the emitting side is amplified. Transmission fiber 3
It goes out to. When the pumping light source 18 is out of order, the changeover switch 20 can be immediately switched to the pumping light source 19 side, and communication can be continued without trouble.

【００１９】[0019]

【発明の効果】以上詳細に説明したように本発明の双方
向励起型光増幅器は、動作させる励起用光源１つだけで
双方向励起が実現でき、励起用光源の駆動電源回路は単
独ですむため、コンパクトでかつ安価なものとなる。特
に単一の駆動電源回路を切換回路で複数の励起用光源の
うちの一つに切換える構成の光増幅器では、一方の励起
用光源に支障があった場合でも、切換により増幅動作が
続けられるため、この光増幅器を利用するシステムの信
頼性が高まることになる。As described in detail above, the bidirectional pumping optical amplifier of the present invention can realize bidirectional pumping with only one pumping light source to be operated, and a single driving power supply circuit for the pumping light source is required. Therefore, it is compact and inexpensive. In particular, in an optical amplifier configured to switch a single drive power supply circuit to one of a plurality of pumping light sources by a switching circuit, even if one pumping light source has a problem, switching operation continues amplification. , The reliability of the system using this optical amplifier will be improved.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明を適用する双方向励起型光増幅器の実施
例のブロック図である。FIG. 1 is a block diagram of an embodiment of a bidirectional pumping optical amplifier to which the present invention is applied.

【図２】本発明を適用する双方向励起型光増幅器の別な
実施例のブロック図である。FIG. 2 is a block diagram of another embodiment of a bidirectional pumping optical amplifier to which the present invention is applied.

【図３】本発明を適用する双方向励起型光増幅器の別な
実施例のブロック図である。FIG. 3 is a block diagram of another embodiment of a bidirectional pumping optical amplifier to which the present invention is applied.

【図４】本発明を適用する双方向励起型光増幅器の別な
実施例のブロック図である。FIG. 4 is a block diagram of another embodiment of a bidirectional pumping optical amplifier to which the present invention is applied.

【図５】従来の双方向励起型光増幅器の実施例のブロッ
ク図である。FIG. 5 is a block diagram of an embodiment of a conventional bidirectional pumping optical amplifier.

【符号の説明】[Explanation of symbols]

１は活性元素ドープファイバ、２・３は信号光伝送用フ
ァイバ、４・５・６・７は光アイソレータ、８・１０・
１３・１８・１９は励起用光源、９・１１・14は駆動電
源回路、１５・１６・１７・２２は光合分波器、２０は
切替回路、２１はレーザービームスプリッタ。Reference numeral 1 is an active element-doped fiber, 2.3 is a signal light transmission fiber, 4.5.6.7 is an optical isolator, and 8.10.
13.18.19 is a pumping light source, 9.11.14 is a drive power supply circuit, 15.16.17.22 is an optical multiplexer / demultiplexer, 20 is a switching circuit, and 21 is a laser beam splitter.

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 励起用光源からの励起光を、入射側の信
号光伝送用ファイバと出射側の信号光伝送用ファイバと
の中間に接続される活性元素ドープファイバの入射側と
出射側の双方から導入させて、活性元素ドープファイバ
中で活性元素の誘導放出光により信号光を増幅する双方
向励起型光増幅器において、単一の励起用光源からの励
起光を分割する光学手段を有し、該光学手段により分割
した励起光の一方を前記活性元素ドープファイバの入射
側に光学的に接続し、もう一方を活性元素ドープファイ
バの出射側に光学的に接続し、活性元素ドープファイバ
の入射側および出射側の双方から励起光を導入させるこ
とを特徴とする双方向励起型光増幅器。1. A pumping light from a pumping light source is connected to an intermediate side between a signal light transmitting fiber on the incident side and a signal light transmitting fiber on the emitting side, both on the incident side and the emitting side of an active element-doped fiber. Introduced from, in the bidirectional pumping optical amplifier for amplifying the signal light by the stimulated emission light of the active element in the active element-doped fiber, having an optical means for splitting the pumping light from a single pumping light source, One of the excitation lights split by the optical means is optically connected to the incident side of the active element-doped fiber, and the other is optically connected to the exit side of the active element-doped fiber, the incident side of the active element-doped fiber. A bidirectional pumping optical amplifier characterized in that pumping light is introduced from both the output side and the output side. 【請求項２】 前記した励起光を分割する光学手段が光
ファイバ合分波器であることを特徴とする請求項１に記
載の双方向励起型光増幅器。2. The bidirectional pumping optical amplifier according to claim 1, wherein the optical means for splitting the pumping light is an optical fiber multiplexer / demultiplexer. 【請求項３】 前記した励起光を分割する光学手段がレ
ーザービームスプリッタであることを特徴とする請求項
１に記載の双方向励起型光増幅器。3. The bidirectional pumping optical amplifier according to claim 1, wherein the optical means for splitting the pumping light is a laser beam splitter. 【請求項４】 励起用光源からの励起光を、入射側の信
号光伝送用ファイバと出射側の信号光伝送用ファイバと
の中間に接続される活性元素ドープファイバの入射側と
出射側の双方から導入させて、活性元素ドープファイバ
中で活性元素の誘導放出光により信号光を増幅する双方
向励起型光増幅器において、単一の駆動電源回路に切換
回路を介して複数の励起用光源が接続しており、該複数
の励起用光源を入力とする光ファイバ合分波器の第１の
出力ポートを前記活性元素ドープファイバの入射側に光
学的に接続し、第２の出力ポートを活性元素ドープファ
イバの出射側に光学的に接続し、活性元素ドープファイ
バの入射側および出射側の双方から励起光を導入させる
ことを特徴とする双方向励起型光増幅器。4. Excitation light from an excitation light source is connected to the middle of the signal light transmission fiber on the incident side and the signal light transmission fiber on the emission side, both on the incident side and the emission side of the active element-doped fiber. , A bidirectional pumping optical amplifier that amplifies the signal light by stimulated emission light of the active element in the active element-doped fiber, multiple pumping light sources are connected to a single drive power supply circuit via a switching circuit. The first output port of the optical fiber multiplexer / demultiplexer having the plurality of pumping light sources as inputs is optically connected to the incident side of the active element-doped fiber, and the second output port is connected to the active element. A bidirectional pumping optical amplifier, which is optically connected to the exit side of a doped fiber and introduces pumping light from both the entrance side and the exit side of an active element-doped fiber.
JP5068647A 1993-03-26 1993-03-26 Bidirectional pumping light amplifier Pending JPH06283790A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5068647A JPH06283790A (en) 1993-03-26 1993-03-26 Bidirectional pumping light amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5068647A JPH06283790A (en) 1993-03-26 1993-03-26 Bidirectional pumping light amplifier

Publications (1)

Publication Number Publication Date
JPH06283790A true JPH06283790A (en) 1994-10-07

Family

ID=13379715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5068647A Pending JPH06283790A (en) 1993-03-26 1993-03-26 Bidirectional pumping light amplifier

Country Status (1)

Country Link
JP (1) JPH06283790A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6016219A (en) * 1996-12-31 2000-01-18 Lucent Technologies Inc. Optical protection switching system
US6690507B2 (en) * 2002-01-30 2004-02-10 Corning Incorporated Double-pumped raman amplifier
US7391562B2 (en) 1995-03-20 2008-06-24 Fujitsu Limited Optical fiber amplifier and dispersion compensating fiber module for optical fiber amplifier
CN111162433A (en) * 2019-12-20 2020-05-15 江苏亮点光电科技有限公司 Optical fiber laser light path structure suitable for low-power MOPA laser

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7391562B2 (en) 1995-03-20 2008-06-24 Fujitsu Limited Optical fiber amplifier and dispersion compensating fiber module for optical fiber amplifier
US7466477B2 (en) 1995-03-20 2008-12-16 Fujitsu Limited Optical fiber amplifier and dispersion compensating fiber module for optical fiber amplifier
US6016219A (en) * 1996-12-31 2000-01-18 Lucent Technologies Inc. Optical protection switching system
US6690507B2 (en) * 2002-01-30 2004-02-10 Corning Incorporated Double-pumped raman amplifier
CN111162433A (en) * 2019-12-20 2020-05-15 江苏亮点光电科技有限公司 Optical fiber laser light path structure suitable for low-power MOPA laser

Similar Documents

Publication Publication Date Title
JP2928149B2 (en) Optical fiber amplifier
EP0541061B1 (en) Optical-fiber light amplifier
EP0914015B1 (en) Optical add-drop multiplexer
US7034997B2 (en) Wideband optical fiber amplifier
JPH06342952A (en) Optical fiber amplifier and optical fiber transmission system
JPH06283790A (en) Bidirectional pumping light amplifier
US7119948B2 (en) Optical amplifier apparatus and method
US20020159138A1 (en) Access device for pump source in cascade erbium-doped fiber amplification
JP2707892B2 (en) Optical wavelength division multiplexing
JPH1174595A (en) Optical fiber amplifier
JP2714692B2 (en) Wavelength multiplexing signal light separation switching device
JPH11112065A (en) Optical fiber amplifier
JPH06252486A (en) Optical fiber amplifier
JP2694014B2 (en) Bidirectional optical amplifier transmission circuit
JP2002176218A (en) Optical amplifier, optical amplification method, and light source equipment
JP2000114624A (en) Bi-directional excitation light direct amplifying device
JP2682870B2 (en) Optical amplifier
JP2550862B2 (en) Bidirectional optical amplifier
JP2002048937A (en) Multistage optical demultuplexer and multistage optical multiplexer
JP2744471B2 (en) Optical amplification transmission circuit
JP3290707B2 (en) Optical amplifier
JPH1187823A (en) Light amplifier
JP2000114625A (en) Direct optical amplification device
JP2000261077A (en) Optical circuit
JP2914024B2 (en) Optical amplifier