JPH04151126A - Optical amplifier - Google Patents

Optical amplifier

Info

Publication number
JPH04151126A
JPH04151126A JP2060812A JP6081290A JPH04151126A JP H04151126 A JPH04151126 A JP H04151126A JP 2060812 A JP2060812 A JP 2060812A JP 6081290 A JP6081290 A JP 6081290A JP H04151126 A JPH04151126 A JP H04151126A
Authority
JP
Japan
Prior art keywords
optical fiber
light
signal light
optical
rare earth
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
Application number
JP2060812A
Other languages
Japanese (ja)
Other versions
JP2744668B2 (en
Inventor
Junichiro Yamashita
純一郎 山下
Akihiro Adachi
明宏 足立
Eiichi Nakagawa
栄一 仲川
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2060812A priority Critical patent/JP2744668B2/en
Publication of JPH04151126A publication Critical patent/JPH04151126A/en
Application granted granted Critical
Publication of JP2744668B2 publication Critical patent/JP2744668B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Light Guides In General And Applications Therefor (AREA)
  • Optical Communication System (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Lasers (AREA)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To realize sufficient optical amplifying operation by utilizing exciting light effectively and to realize the optical amplifier which is small in size by providing a means which transmits signal light and reflects and returns the exciting light into an optical fiber for amplification, and making the exciting light travel reciprocally in the optical fiber for amplification. CONSTITUTION:The exciting light emitted by an LD module 6 for excitation and the signal light 3 are multiplexed by an optical coupler 8 and made incident on one end of an optical fiber 5 doped with a rare earth element to travel to the other end. At this time, the exciting light is absorbed by the rare earth element in the doped optical fiber 5, but much light reaches the projection end since the loss is small. At this time, the means 12 which transmits the signal light and reflects and returns the exciting light into the rare-earth-element doped optical fiber 5 is provided at the projection end. Consequently, the amplified signal light 3 is passed and projected nearly without being affected, but the exciting light is reflected and returned into the rare-earth-element doped optical fiber 5 to contribute to absorption. Consequently, small-sized, easy and sufficient optical amplifying operation is realized with the short rare-earth- element doped optical fiber.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、光ファイバ通信系等において用いられ、入
射した信号光を増幅して出射する増幅用光ファイバを備
えた光増幅器に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical amplifier that is used in an optical fiber communication system, etc., and is equipped with an amplification optical fiber that amplifies input signal light and outputs the amplified signal light. .

[従来の技術] 第3図は、例えば、島田によって0plusENo、1
13(1989)に示された、増幅用光ファイバとして
希土類ドープ光ファイバを用いた従来の光増幅器の構成
を説明する一部切り欠いて示す斜視図である。図におい
て、(1)は光増幅器、(2)は光増幅器(1)の筐体
、(3)は光増幅器(1)に入射される信号光、(4)
は信号光(3)を入射させるための筐体(2)に設けら
れた入カコ不りター (5)は増幅用光ファイバとして
用いられている希土類ドープ光ファイバ、(6)は希土
類ドープ光ファイバ(5)の一端から励起光を入射させ
て励起する励起手段である励起用LDモジュール、(7
)は励起用LDモジュール(6)を駆動するためのLD
ドライバー (8)は信号光(3)と励起光を希土類ド
ープ光ファイバ(5)へ入射させるための光結合器、(
9)は希土類ドープ光ファイバ(5)内で増幅された信
号光(3)を取り出すために筐体(2)に設けられた出
力コネクター (10)は信号光(3)の進路を示す矢
印、(11)は励起光の進路を示す矢印である。
[Prior art] FIG. 3 shows, for example, 0plusENo, 1 by Shimada.
13 (1989) and is a partially cutaway perspective view illustrating the configuration of a conventional optical amplifier using a rare earth-doped optical fiber as an amplification optical fiber. In the figure, (1) is the optical amplifier, (2) is the housing of the optical amplifier (1), (3) is the signal light incident on the optical amplifier (1), and (4) is the optical amplifier (1).
(5) is a rare earth-doped optical fiber used as an amplification optical fiber, and (6) is a rare-earth doped optical fiber. A pumping LD module (7), which is a pumping means for pumping the fiber (5) by inputting pumping light from one end of the fiber (5).
) is an LD for driving the excitation LD module (6)
The driver (8) is an optical coupler (
9) is an output connector provided on the housing (2) to take out the signal light (3) amplified within the rare earth doped optical fiber (5); and (10) is an arrow indicating the path of the signal light (3); (11) is an arrow indicating the path of the excitation light.

ここで、励起光の周波数は信号光(3)の周波数より高
く(波長は短く)設定されており、希土類ドープ光ファ
イバ(5)は、励起光(19)・吸収することにより、
内部に反転分布を生じる。
Here, the frequency of the pumping light is set higher (the wavelength is shorter) than the frequency of the signal light (3), and the rare earth-doped optical fiber (5) absorbs the pumping light (19).
Population inversion occurs internally.

このように反転分布が生している希土類ドープづファイ
バ(5)中に、共鳴周波数に対応する周を数を有する信
号光(3)が入射すると、この刺さによって誘導放出か
生じ、信号光(3)と同−刃波数、同一位相の光が放出
される。従って、希二類ドープ光ファイバ(5)の出射
端における信↓光(3)の強度は、入射端に比べ大きく
なり、も号光(3)は増幅される。なお、この光増幅器
1:光ファイバ通信系等において、送信装置の産出ノ増
幅器、受信装置の前置増幅器、及び、中間増軛器等とし
て用いられる。
When a signal light (3) having a circumference corresponding to the resonant frequency enters the rare earth-doped fiber (5) in which population inversion occurs in this way, stimulated emission occurs due to this stab, and the signal light ( Light with the same blade wave number and phase as 3) is emitted. Therefore, the intensity of the signal light (3) at the output end of the rare class doped optical fiber (5) is greater than that at the input end, and the signal light (3) is amplified. The optical amplifier 1 is used as an output amplifier of a transmitting device, a preamplifier of a receiving device, an intermediate multiplier, etc. in an optical fiber communication system.

また、上記の光増幅作用において、希土類ドープ光ファ
イバ(5)は励起光を有効に吸収する戸、め、ある程度
の長さが必要となる。例えば、希1類元素の1つである
エルビウム(元素記号Er) ’&ドープした1、5μ
m帯用0光ファイバの場合、通常、10〜100m程度
の長さが必要とされている。
Further, in the above-mentioned optical amplification function, the rare earth doped optical fiber (5) needs to have a certain length in order to effectively absorb the excitation light. For example, erbium (element symbol Er), which is one of the rare elements, & doped 1,5μ
In the case of an m-band 0 optical fiber, a length of about 10 to 100 m is usually required.

[発明が解決しようとする課題] 従来の光増幅器は以上のように構成されているので、長
い希土類ドープ光ファイバを必要とした。
[Problems to be Solved by the Invention] Since the conventional optical amplifier is configured as described above, a long rare earth doped optical fiber is required.

また、十分な励起光を供給できる小型かつ簡便で高出力
の励起光源が得難いという問題点があった。
Another problem is that it is difficult to obtain a compact, simple, and high-output excitation light source that can supply sufficient excitation light.

この発明は、上記のような問題点を解決するためになさ
れたものであり、短い希土類ドープ光ファイバで、小型
かつ簡便な励起光源で得られる励起光を有効に利用して
十分な光増幅作用を得る、小型の光増幅器を実現するこ
とを目的とする。
This invention was made in order to solve the above-mentioned problems, and effectively utilizes the pumping light obtained from a small and simple pumping light source with a short rare-earth doped optical fiber to achieve sufficient optical amplification effect. The aim is to realize a compact optical amplifier that obtains the following characteristics.

[課題を解決するための手段] この発明に係わる光増幅器は、希土類ドープ光ファイバ
等の増幅用光ファイバの一端から励起光を入射させ、励
起光の出射する他端に、信号光を透過し、かつ、励起光
を反射して増幅用光ファイバ内に戻す手段を設け、励起
光を増幅用光ファイバ内で往復させる構成とした。
[Means for Solving the Problems] An optical amplifier according to the present invention allows pumping light to enter from one end of an amplification optical fiber such as a rare earth-doped optical fiber, and transmits signal light to the other end from which the pumping light is emitted. In addition, a means for reflecting the excitation light back into the amplification optical fiber is provided, and the excitation light is made to reciprocate within the amplification optical fiber.

[作用] 上記のように構成された光増幅器では、信号光を透過し
、かつ、励起光を反射して増幅用光ファイバ内に戻す手
段を設け、励起光を増幅用光ファイバ内で往復させるた
め、励起光が有効に利用でき、短い増幅用光ファイバで
も十分な励起光の吸収が行われる。
[Function] In the optical amplifier configured as described above, a means is provided to transmit the signal light and reflect the excitation light and return it into the amplification optical fiber, so that the excitation light is reciprocated within the amplification optical fiber. Therefore, the pumping light can be used effectively, and even a short amplification optical fiber can sufficiently absorb the pumping light.

[実施例] 第1図はこの発明の光増幅器の一実施例の構成を説明す
る一部切り欠いて示す斜視図であり、(1)〜(10)
は第3図に示した従来の光増幅器に相当するものである
。(12)は希土類ドープ光ファイバ(5)の励起光の
出射端に設けられた、信号光を透過し、かつ、励起光を
反射して希土類ドープ光ファイバ(5)内に戻す手段、
(13)は励起光の進路を示す矢印である。
[Embodiment] FIG. 1 is a partially cutaway perspective view illustrating the configuration of an embodiment of the optical amplifier of the present invention, and includes (1) to (10).
corresponds to the conventional optical amplifier shown in FIG. (12) means provided at the excitation light output end of the rare earth doped optical fiber (5) for transmitting the signal light and reflecting the excitation light back into the rare earth doped optical fiber (5);
(13) is an arrow indicating the path of the excitation light.

なお、このような光増幅器においては、用いる信号光(
3)及び励起光の波長、希土類ドープ光ファイバ(5)
の種類は、上記従来例で説明したように、反転分布の原
理に従うように設定される。
Note that in such an optical amplifier, the signal light used (
3) and wavelength of excitation light, rare earth doped optical fiber (5)
The type of is set to follow the principle of population inversion, as explained in the conventional example above.

また、この実施例においては、上記の手段(12)とし
て、波長特性の良い誘電体多層膜フィルタ等の干渉フィ
ルタを用い、これを希土類ドープ光ファイバ(5)の出
射端に近接させ、光軸に垂直に設置したものである。光
結合器(8)としてはファイバ形、プリズム形等の2分
岐光回路や、ファイバ形、プリズム形等て干渉フィルタ
を用いた合波器等が用いられる。
Further, in this embodiment, as the above means (12), an interference filter such as a dielectric multilayer filter with good wavelength characteristics is used, and this is placed close to the output end of the rare earth doped optical fiber (5), so that the optical axis It is installed vertically. As the optical coupler (8), a two-branch optical circuit such as a fiber type or prism type, or a multiplexer using an interference filter such as a fiber type or prism type is used.

上記のように構成された光増幅器においては、励起用L
Dモジュール(6)から出射された励起光及び信号光(
3)は光結合器(8)により合流されて希土類ドープ光
ファイバ(5)の一端から入射し、他端に進む。この時
、励起光は希土類ドープ光ファイバ(5)中の希土類に
吸収されるが、損失が少ないため、多くが出射端に到達
する。すると、出射端には信号光を透過し、がっ、励起
光を反射して希土類ドープ光ファイバ(5)内に戻す手
段(12)が設けられているため、増幅された信号光(
3)はほとんど影響を受けずに通り抜けて出射されるが
、励起光は反射されて再び希土類ドープ光ファイバ(5
)内に戻され、吸収に寄与する。なお、信号光(3)に
対する光増幅作用は上記従来例で説明したのと同様であ
り、説明を省略する。また、上記光増幅器は光結合器(
8)を分波特性を有する構成とした場合には、信号光(
3)を出力コネクター(9)側から入射させ、入力コネ
クター(4)側から増幅された信号光(3)を出射させ
るように用いることができる。
In the optical amplifier configured as above, the pumping L
Excitation light and signal light (
3) are combined by an optical coupler (8), enter the rare earth doped optical fiber (5) from one end, and proceed to the other end. At this time, the excitation light is absorbed by the rare earth in the rare earth doped optical fiber (5), but since the loss is small, most of it reaches the output end. Then, since the output end is provided with a means (12) that transmits the signal light and reflects the excitation light and returns it into the rare earth doped optical fiber (5), the amplified signal light (
3) is emitted through the rare earth doped optical fiber (5
) and contribute to absorption. Note that the optical amplification effect on the signal light (3) is the same as that explained in the above conventional example, and the explanation will be omitted. In addition, the above optical amplifier is an optical coupler (
8) is configured to have demultiplexing characteristics, the signal light (
3) can be input from the output connector (9) side, and the amplified signal light (3) can be emitted from the input connector (4) side.

以上のように、この実施例においては、短い希土類ドー
プ光ファイバと、小型かつ簡便なLDモジユール等で得
られる励起光で十分な光増幅作用を得ることができ、経
済的で小型の光増幅器を実現できる効果がある。
As described above, in this embodiment, a sufficient optical amplification effect can be obtained using a short rare earth-doped optical fiber and a pump light obtained from a small and simple LD module, etc., and an economical and small optical amplifier can be constructed. There are effects that can be achieved.

なお、上記実施例では、手段(12)として、波長特性
の良い誘電体多層膜フィルタ等の干渉フィルタを用い、
これを希土類ドープ光ファイバ(5)の出射端に近接さ
せ、光軸に垂直に設置したものを示したが、希土類ドー
プ光ファイバ(5)の出射端から離す場合には、レンズ
を挿入して平行光に変換すればよく、更に、希土類ドー
プ光ファイバ(5)の出射端に直接に、誘電体多層膜フ
ィルタ等を蒸着しても良い。この場合には希土類ドープ
光ファイバ(5)の出射端における信号光(8)に対す
る無反射膜の効果も有する。
In the above embodiment, as the means (12), an interference filter such as a dielectric multilayer filter with good wavelength characteristics is used,
This is shown as being placed close to the output end of the rare earth doped optical fiber (5) and perpendicular to the optical axis, but if it is placed away from the output end of the rare earth doped optical fiber (5), a lens must be inserted. It is sufficient to convert the light into parallel light, and furthermore, a dielectric multilayer filter or the like may be deposited directly on the output end of the rare earth doped optical fiber (5). In this case, the anti-reflection film also has an effect on the signal light (8) at the output end of the rare earth doped optical fiber (5).

第2図は、この発明の光増幅器を光信号受信系に適用し
た場合の一実施例を示す概略構成説明図であり、信号光
(3)を出力コネクター(9)側から入射させ、入力コ
ネクター(4)側から増幅された信号光(3)を出射さ
せるように用いた場合である。図において、(14)は
希土類ドープ光ファイバ(5)の端末、(15)は光結
合器(8)を構成するレンズ、(16)は希土類ドープ
光ファイバ(5)から出射された信号光(8)を反射し
、励起光を透過する光結合器(8)を構成する干渉フィ
ルタ、(17)は増幅された信号光(3)を受光するフ
ォトダイオード等で構成された受信手段、(18)は励
起用LDモジュール(6)を駆動するための励起発光半
導体直流電源(19)は筐体であり、その他の構成は第
1図に示した実施例と同一である。
FIG. 2 is a schematic configuration explanatory diagram showing an embodiment in which the optical amplifier of the present invention is applied to an optical signal receiving system, in which signal light (3) is input from the output connector (9) side, This is a case where the amplified signal light (3) is emitted from the (4) side. In the figure, (14) is the terminal of the rare earth doped optical fiber (5), (15) is the lens constituting the optical coupler (8), and (16) is the signal light ( (17) is a receiving means composed of a photodiode, etc., which receives the amplified signal light (3); ), the excitation light emitting semiconductor DC power supply (19) for driving the excitation LD module (6) is a housing, and the other configurations are the same as the embodiment shown in FIG.

上記のように構成された光受信器において、励起光発光
半導体用直流電源(18)によって駆動される励起用L
Dモジュール(6)から射出された励起光は、励起光集
光光学系(15g)で希土類ドープ光ファイバ(5)の
出射端末(14)に集光され、希土類ドープ光ファイバ
(5)に入射する。なお、励起光・信号光分離フィルタ
(16)は、励起光の波長域に対しては透過、信号光の
波長域に対しては反射するように設定された干渉フィル
タであり、入射した信号光(3)は、希土類ドープ光フ
ァイバ(5)で増幅された後に出射端末(14)から出
射される。出射された信号光は励起光・信号光分布フィ
ルタ(16)によって光路を折り曲げられた後に、信号
光集光光学系(15b)によって受信手段(17)に集
光される。
In the optical receiver configured as described above, the excitation L is driven by the excitation light emitting semiconductor DC power supply (18).
The excitation light emitted from the D module (6) is focused on the output terminal (14) of the rare earth doped optical fiber (5) by the excitation light condensing optical system (15g), and enters the rare earth doped optical fiber (5). do. The excitation light/signal light separation filter (16) is an interference filter that is set to transmit the wavelength range of the excitation light and reflect the wavelength range of the signal light. (3) is amplified by the rare earth doped optical fiber (5) and then emitted from the output terminal (14). The emitted signal light has its optical path bent by the excitation light/signal light distribution filter (16), and then is focused onto the receiving means (17) by the signal light focusing optical system (15b).

励起光反射フィルタ(12)は励起光の波長域に対して
は反射、信号光の波長域に対しては透過するように設定
された干渉フィルタであり、希土類ドープ光ファイバ(
5)を伝搬した励起光(13)を反射する。従って、励
起光(13)は希土類ドープ光ファイバ(5)中を往復
することとなり、単位長当たりの吸収量が大きくなるた
め、短い希土類ドープ光ファイバ(5)であっても有効
な増幅が行える。
The excitation light reflection filter (12) is an interference filter set to reflect the wavelength range of the excitation light and transmit the wavelength range of the signal light.
5) and reflects the excitation light (13) propagated through. Therefore, the excitation light (13) travels back and forth within the rare earth doped optical fiber (5), and the amount of absorption per unit length increases, so effective amplification can be achieved even with a short rare earth doped optical fiber (5). .

なお、上記第1図に示した実施例では説明を省略したが
、一般に、希土類ドープ光ファイバ(5)の両端に信号
光(3)の波長域に対する反射点かある場合には、信号
に対するエコーが生し、また、利得波長域に対する反射
点がある場合には、帰還がかがりレーザ発振が生しるた
め、希土類ドープ光ファイバ(5)の端末には反射を抑
圧する手段を備える必要がある。ここでは、(14)は
希土類ドープ光ファイバ(5)の端末であり、斜めに研
磨加工等で仕上げた場合を示している。なお、この他、
希土類ドープ光ファイバ(5)の端末(14)に信号光
(8)に対する無反射膜を蒸着等で付けても良い。
Although the explanation was omitted in the embodiment shown in FIG. occurs, and if there is a reflection point in the gain wavelength range, the feedback is overcast and laser oscillation occurs, so it is necessary to provide a means to suppress reflection at the terminal of the rare earth doped optical fiber (5). . Here, (14) is the end of the rare earth-doped optical fiber (5), which is finished obliquely by polishing or the like. In addition, in addition to this,
A non-reflection film for the signal light (8) may be attached to the end (14) of the rare earth doped optical fiber (5) by vapor deposition or the like.

また、上記の構成においては、希土類ドープ光ファイバ
(5)の端末(14)から信号光(8)と共に出射され
る吸収されなかった励起光は、光結合器(8)が分波特
性を有する構成とされていて、干渉フィルタ(16)に
よって分離されるため、励起光の受信手段(17)への
入射を防止できる。なお、光増幅器において、信号光(
8)を入力コネクター(4)側から入射させ、出力コネ
クター(9)側から増幅された信号光(3)を出射させ
るように用いる場合には、手段(12)が設けられてい
るため問題はない。
In addition, in the above configuration, the optical coupler (8) has a demultiplexing characteristic for the unabsorbed excitation light that is emitted from the terminal (14) of the rare earth doped optical fiber (5) together with the signal light (8). Since the excitation light is separated by the interference filter (16), it is possible to prevent the excitation light from entering the receiving means (17). Note that in the optical amplifier, the signal light (
8) is input from the input connector (4) side and the amplified signal light (3) is emitted from the output connector (9) side, the problem is solved because the means (12) is provided. do not have.

以上のように、この実施例においては、信号光(3)を
出力コネクター(9)側から入射させ、入力コネクター
(4)側から増幅された信号光(3)を出射させるよう
にして光増幅器を光信号受信系に適用しているので、希
土類ドープ光ファイバ(5)に対して受信手段(17)
を励起用LDモジュール(6)と同一の端部に配置する
ことができ、コンパクトに光信号受信系を構成できる。
As described above, in this embodiment, the optical amplifier is applied to the optical signal receiving system, the receiving means (17) is used for the rare earth doped optical fiber (5).
can be placed at the same end as the excitation LD module (6), making it possible to configure a compact optical signal receiving system.

また、励起光の光源となる発光半導体の放射光を、励起
光伝搬ファイバを介さずに集光光学系を用いて増幅用光
ファイバの一端から入射させ、かつ、上記集光光学系の
一部に励起光と信号光との光路を異ならせる手段を設け
、かつ、増幅用光ファイバから出射される信号光を他の
光ファイバを介さずに上記とは別の集光光学系を用いて
受光半導体に入射させる構成としたため、先受信器全体
が小型に構成できる。
Further, the emitted light of the light emitting semiconductor serving as the light source of the excitation light is made to enter from one end of the amplification optical fiber using a condensing optical system without going through the excitation light propagation fiber, and a part of the condensing optical system is A means is provided to make the optical paths of the excitation light and signal light different, and the signal light emitted from the amplification optical fiber is received using a condensing optical system different from the above without passing through another optical fiber. Since the light is incident on a semiconductor, the entire receiver can be made compact.

更に、光結合器、励起用LDモジュール等の個別の組み
合わせられている光学部品を単一の筐体(19)内に収
納することによって光受信器を小型に構成できる。
Furthermore, the optical receiver can be constructed in a compact size by housing the optical components that are combined individually, such as the optical coupler and the excitation LD module, in a single housing (19).

なお1、以上の実施例においては、光増幅器を光ファイ
バで構成した場合を示したが、この発明は光ファイバを
希土類ドープ光導波路などに置き換えた場合にも適用で
き、上記同様の効果を奏することは自明である。
1. In the above embodiments, the case where the optical amplifier is constructed of an optical fiber is shown, but the present invention can also be applied to a case where the optical fiber is replaced with a rare earth doped optical waveguide, and the same effects as described above can be obtained. That is self-evident.

加えて、以上の実施例においては、増幅用光ファイバが
希土類ドープ光ファイバの場合を示したが、この発明は
増幅用光ファイバの種類によらず適用でき、上記同様の
効果を奏する。
In addition, in the above embodiments, the amplification optical fiber is a rare earth doped optical fiber, but the present invention can be applied regardless of the type of amplification optical fiber, and the same effects as described above can be achieved.

[発明の効果コ 以上のように、この発明によれば、希土類ドープ光ファ
イバ等の増幅用光ファイバの一端から励起光を入射させ
、励起光の出射する他端に、信号光を透過し、かつ、励
起光を反射して増幅用光ファイバ内に戻す手段を設け、
励起光を増幅用光ファイバ内で往復させる構成としたの
で、短い希土類トープ光ファイバで、励起光を有効に利
用して十分な光増幅作用を得ることができ、小型の光増
幅器を実現できる。
[Effects of the Invention] As described above, according to the present invention, pumping light is input from one end of an amplification optical fiber such as a rare earth doped optical fiber, and signal light is transmitted to the other end from which the pumping light is emitted. and a means for reflecting the excitation light back into the amplification optical fiber,
Since the pumping light is configured to be reciprocated within the amplification optical fiber, the pumping light can be used effectively and a sufficient optical amplification effect can be obtained with a short rare-earth dope optical fiber, making it possible to realize a compact optical amplifier.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の光増幅器の一実施例の構成を説明す
る一部切り欠いて示す斜視図、第2図はこの発明の光増
幅器を光信号受信系に適用した場合の一実施例を示す概
略構成説明図、第3図は従来の光増幅器の構成を説明す
る一部切り欠いて示す斜視図である。 図において、(1)は光増幅器、(2)は筐体、(3)
は信号光、(4)は入力コネクター (5)は希土類ド
ープ光ファイバ、(6)は励起用LDモジュール、(7
)はLDドライバー (8)は光結合器、(9)は出力
コネクター (10)は信号光(3)の進路を示す矢印
、(11)は励起光の進路を示す矢印、(12)は励起
光反射フィルタ、(13)は励起光の進路を示す矢印、
(14)は希土類ドープ光ファイバ(5)の端末、(1
5)はレンズ、(16)は干渉フィルタ、(17)は受
信手段である。 なお、図中、同一符号は同一または相当部分を示す。 代理人 弁理士 吉 1)研 二 (外2名) 光増幅器 光結合器 第 図
FIG. 1 is a partially cutaway perspective view illustrating the configuration of an embodiment of the optical amplifier of the present invention, and FIG. 2 is an embodiment of the optical amplifier of the present invention applied to an optical signal receiving system. FIG. 3 is a partially cutaway perspective view illustrating the configuration of a conventional optical amplifier. In the figure, (1) is the optical amplifier, (2) is the housing, and (3) is the optical amplifier.
is the signal light, (4) is the input connector, (5) is the rare earth doped optical fiber, (6) is the excitation LD module, (7
) is the LD driver (8) is the optical coupler, (9) is the output connector, (10) is the arrow that shows the path of the signal light (3), (11) is the arrow that shows the path of the excitation light, and (12) is the excitation light. a light reflection filter; (13) is an arrow indicating the path of the excitation light;
(14) is the terminal of rare earth doped optical fiber (5), (1
5) is a lens, (16) is an interference filter, and (17) is a receiving means. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent: Patent attorney Yoshi 1) Kenji (2 others) Optical amplifier optical coupler diagram

Claims (1)

【特許請求の範囲】[Claims] 入射した信号光を増幅して出射する増幅用光ファイバと
、上記増幅用光ファイバの一端から励起光を入射させて
励起する励起手段と、上記増幅用光ファイバの励起光の
出射端に設けられ、上記信号光を透過し、かつ、上記励
起光を反射して増幅用光ファイバ内に戻す手段とを備え
、励起光を増幅用光ファイバ内で往復させることを特徴
とする光増幅器。
an amplification optical fiber that amplifies input signal light and outputs the amplified signal light; a pumping means that pumps the pumping light by inputting it from one end of the amplification optical fiber; and a pumping means provided at the pumping light output end of the amplification optical fiber. An optical amplifier comprising means for transmitting the signal light and for reflecting the pumping light and returning it into the amplification optical fiber, and causing the pumping light to reciprocate within the amplification optical fiber.
JP2060812A 1989-11-17 1990-03-12 Optical signal receiver Expired - Lifetime JP2744668B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2060812A JP2744668B2 (en) 1989-11-17 1990-03-12 Optical signal receiver

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP1-298815 1989-11-17
JP29881589 1989-11-17
JP2060812A JP2744668B2 (en) 1989-11-17 1990-03-12 Optical signal receiver

Publications (2)

Publication Number Publication Date
JPH04151126A true JPH04151126A (en) 1992-05-25
JP2744668B2 JP2744668B2 (en) 1998-04-28

Family

ID=26401863

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2060812A Expired - Lifetime JP2744668B2 (en) 1989-11-17 1990-03-12 Optical signal receiver

Country Status (1)

Country Link
JP (1) JP2744668B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002272745A (en) * 2001-03-14 2002-09-24 Hamamatsu Photonics Kk Breast cancer detector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58115948A (en) * 1981-12-29 1983-07-09 Nec Corp Bidirectional optical amplifier
JPH02221937A (en) * 1989-02-22 1990-09-04 Hitachi Cable Ltd Amplifier for glass waveguide for bidirectional transmission
JPH02306677A (en) * 1989-05-22 1990-12-20 Nippon Telegr & Teleph Corp <Ntt> Photoamplifier
JPH0325985A (en) * 1989-06-23 1991-02-04 Fujitsu Ltd Optical fiber amplifier
JPH0392828A (en) * 1989-09-06 1991-04-18 Kokusai Denshin Denwa Co Ltd <Kdd> Optical fiber laser amplifier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58115948A (en) * 1981-12-29 1983-07-09 Nec Corp Bidirectional optical amplifier
JPH02221937A (en) * 1989-02-22 1990-09-04 Hitachi Cable Ltd Amplifier for glass waveguide for bidirectional transmission
JPH02306677A (en) * 1989-05-22 1990-12-20 Nippon Telegr & Teleph Corp <Ntt> Photoamplifier
JPH0325985A (en) * 1989-06-23 1991-02-04 Fujitsu Ltd Optical fiber amplifier
JPH0392828A (en) * 1989-09-06 1991-04-18 Kokusai Denshin Denwa Co Ltd <Kdd> Optical fiber laser amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002272745A (en) * 2001-03-14 2002-09-24 Hamamatsu Photonics Kk Breast cancer detector

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Publication number Publication date
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