JPH05136512A - Optical amplifier - Google Patents

Optical amplifier

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Publication number
JPH05136512A
JPH05136512A JP30050891A JP30050891A JPH05136512A JP H05136512 A JPH05136512 A JP H05136512A JP 30050891 A JP30050891 A JP 30050891A JP 30050891 A JP30050891 A JP 30050891A JP H05136512 A JPH05136512 A JP H05136512A
Authority
JP
Japan
Prior art keywords
optical
signal light
optical amplifier
wavelength
light
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
JP30050891A
Other languages
Japanese (ja)
Inventor
Masayuki Shigematsu
昌行 重松
Masayuki Nishimura
正幸 西村
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP30050891A priority Critical patent/JPH05136512A/en
Publication of JPH05136512A publication Critical patent/JPH05136512A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To reduce the variation in light amplification gain, and to lessen the distortion of waveform of a signal light by providing an attenuation means with which the signal light amplified by the main body of a light amplifier is outputted by attenuating it with almost complementary wavelength characteristics against the wavelength characteristics of the light amplification gain of the light amplifier main body. CONSTITUTION:The signal light made incident on one end of an Er-doped fiber 46 through the intermediary of an optical fiber coupler 26 is amplified by the induced emission of the exciter Er. The amplified signal light is taken out to an output end through an optical filter 56. As the transmission characteristics of the optical filter 56 has complementary wavelength dependency, the distortion of wavelength of the signal light, caused by the wavelength dependency of light amplification gain on the optical fiber 46, can be compensated. To be more precise, the variation in light amplification gain, caused by the microscopic variation of wavelength of the signal light inputted to the main body part of a light amplifier 6, can be removed by the working of the filter 56, the distortion of wavelength of the signal light outputted from the light amplifier is reduced, and the high degree of noise component generated on the light amplifier can also be decreased.

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、希土類元素、遷移元素
その他の活性物質を添加した光ファイバ等からなる光増
幅器に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical amplifier including an optical fiber doped with a rare earth element, a transition element and other active substances.

【0002】[0002]

【従来の技術】ケーブルテレビの映像伝送その他の分野
においては、光ファイバの特性を生かした多くの伝送シ
ステムが考えられている。このような伝送システムの一
つである残留側波帯強度変調(amplitude modulated ve
stigial sideband)のAM−VSB伝送では、例えば9
1.25〜337.25MHzの範囲に、6MHzごと
に40chのキャリアが含まれる。
2. Description of the Related Art In the field of video transmission of cable television and other fields, many transmission systems utilizing the characteristics of optical fibers have been considered. One such transmission system is amplitude modulated ve
In AM-VSB transmission of stigial sideband), for example, 9
In the range of 1.25 to 337.25 MHz, a carrier of 40 ch is included every 6 MHz.

【0003】図1は、このAM−VSB伝送の送信源と
なるレーザダイオード(以下LDという)の動作を説明
したもので、図1(a)はLDのI−L特性を示し、図
1(b)はLDの信号特性を示す。LDに加える電気信
号を強度変調すれば、この強度変調に応じた光信号がL
Dから出力され、この光信号が光ファイバ中を伝送す
る。
FIG. 1 illustrates the operation of a laser diode (hereinafter referred to as an LD) which is a transmission source of this AM-VSB transmission. FIG. 1A shows the IL characteristic of the LD, and FIG. b) shows the signal characteristics of the LD. When the electric signal applied to the LD is intensity-modulated, the optical signal corresponding to this intensity modulation is L
The optical signal output from D is transmitted through the optical fiber.

【0004】しかしLDは、その入力電流が増大する
と、一般にその出力光の波長がプラズマ効果によって短
波長側にシフトする。したがって、伝送用の光ファイバ
中を通過したLDの出力光を増幅する光ファイバ増幅器
の増幅特性に波長依存性が存在する場合、光ファイバ増
幅器で増幅された光信号の波形に歪みが発生する。
However, when the input current of the LD increases, the wavelength of its output light generally shifts to the short wavelength side due to the plasma effect. Therefore, when there is wavelength dependence in the amplification characteristic of the optical fiber amplifier that amplifies the output light of the LD that has passed through the optical fiber for transmission, distortion occurs in the waveform of the optical signal amplified by the optical fiber amplifier.

【0005】図2は、光ファイバ増幅器の波長依存性に
起因して発生する光信号の歪みを説明した図である。図
2(a)は光増幅器の光増幅利得の波長依存性を示し、
図2(b)は光増幅器への入力信号光と出力信号光の波
形を比較したものである。入力信号光の強度が比較的強
くなると、LDから発生する信号光が短波長側にシフト
するので、光増幅器の利得が減少してしまう。この結
果、実線のような入力信号光の波形が点線のような波形
に歪んで出力される。
FIG. 2 is a diagram for explaining the distortion of an optical signal caused by the wavelength dependence of an optical fiber amplifier. FIG. 2A shows the wavelength dependence of the optical amplification gain of the optical amplifier,
FIG. 2B compares the waveforms of the input signal light and the output signal light to the optical amplifier. When the intensity of the input signal light becomes relatively strong, the signal light generated from the LD shifts to the short wavelength side, so that the gain of the optical amplifier decreases. As a result, the waveform of the input signal light as shown by the solid line is distorted and outputted as the waveform as shown by the dotted line.

【0006】かかる出力信号の歪みに起因して、キャリ
ア周波数f1 の2倍の周波数成分すなわち2次高調波成
分(2HD:2nd order harmonic distortion )が生じ
てしまう。またこのような歪みに起因して、キャリア周
波数f1 と別のキャリア周波数f2 との和及び差f1 ±
2 に対応する周波数成分すなわち複合2次相互変調成
分(CSO:composite 2nd order distortion)が生じ
てしまう。これらの2HDやCSOはノイズの原因とな
る。
Due to the distortion of the output signal, a frequency component twice as high as the carrier frequency f 1 , that is, a second harmonic component (2HD: 2nd order harmonic distortion) is generated. Further, due to such distortion, the sum and difference f 1 ± of the carrier frequency f 1 and another carrier frequency f 2
A frequency component corresponding to f 2 , that is, a composite second-order intermodulation component (CSO: composite 2nd order distortion) is generated. These 2HD and CSO cause noise.

【0007】このような出力信号の歪みを電気的に補正
する方法については、文献「Optical Amplifier and th
eir Applications '91 PD-10」に詳しく開示されてい
る。
For a method of electrically correcting such distortion of the output signal, see the document "Optical Amplifier and th".
eir Applications '91 PD-10 ”.

【0008】[0008]

【発明が解決しようとする課題】しかし、2HDやCS
Oの電気的補正は、複雑なものとなってしまう。そこで
本発明は、出力信号の波形歪みに起因する2HDやCS
Oのノイズの発生を簡易かつ効果的に防止する光増幅器
を提供することを目的とする。
However, 2HD and CS
The electrical correction of O becomes complicated. Therefore, according to the present invention, 2HD and CS caused by the waveform distortion of the output signal
An object of the present invention is to provide an optical amplifier that can easily and effectively prevent the generation of O noise.

【0009】[0009]

【課題を解決するための手段】上記課題を解決するた
め、本発明に係る第1の光増幅器は、(a)活性物質を
添加した光ファイバ(若しくは光導波路装置)及びこの
活性物質を励起する光源を有するとともに、入力した信
号光を光ファイバ(若しくは光導波路装置)内の励起さ
れた活性物質によって光増幅して出力する光増幅器本体
と、(b)光増幅器本体によって光増幅された信号光
を、この光増幅器本体の光増幅利得の波長特性に対して
略相補的な波長特性で減衰して出力する減衰手段とを備
えることとしている。
In order to solve the above problems, a first optical amplifier according to the present invention comprises (a) an optical fiber (or an optical waveguide device) doped with an active substance and the active substance. An optical amplifier body which has a light source and optically amplifies the input signal light by an excited active substance in an optical fiber (or an optical waveguide device) and outputs the signal light, and (b) a signal light optically amplified by the optical amplifier body. And an attenuator for attenuating and outputting with a wavelength characteristic substantially complementary to the wavelength characteristic of the optical amplification gain of the optical amplifier body.

【0010】また、本発明に係る第2の光増幅器は、
(a)活性物質を添加した光ファイバ(若しくは光導波
路装置)及びこの活性物質を励起する光源を有するとと
もに、入力した信号光を光ファイバ(若しくは光導波路
装置)内の励起された活性物質によって光増幅して出力
する光増幅器本体と、(b)光増幅器本体によって光増
幅された信号光を、この光増幅器本体に入力されるべき
信号光の波長変動を伴う強度歪み及びこの光増幅器本体
の光増幅利得の波長特性に対して略相補的な波長特性で
減衰して出力する減衰手段とを備えることとしている。
The second optical amplifier according to the present invention is
(A) An optical fiber (or an optical waveguide device) having an active substance added thereto and a light source for exciting the active substance are provided, and the input signal light is emitted by the excited active substance in the optical fiber (or the optical waveguide device). An optical amplifier main body that amplifies and outputs, and (b) intensity distortion of the signal light optically amplified by the optical amplifier main body accompanied by wavelength fluctuation of the signal light to be input to the optical amplifier main body and light of the optical amplifier main body. Attenuating means for attenuating and outputting with a wavelength characteristic substantially complementary to the wavelength characteristic of the amplification gain is provided.

【0011】[0011]

【作用】上記第1の光増幅器では、減衰手段が光増幅器
本体によって光増幅された信号光を、この光増幅器本体
の光増幅利得の波長特性に対して略相補的な波長特性で
減衰して出力するので、光増幅器本体の光増幅利得の波
長依存性の歪みをこの減衰手段によって補償することが
できる。この結果、光増幅器本体に入力された信号光の
波長の微小変動に起因する光増幅利得の変動を減少させ
ることができ、さらには、光ファイバ増幅器から出力さ
れる信号光の波形の歪みを低減させることができる。
In the first optical amplifier, the attenuator attenuates the signal light optically amplified by the optical amplifier body with a wavelength characteristic substantially complementary to the wavelength characteristic of the optical amplification gain of the optical amplifier body. Since the output is performed, the wavelength-dependent distortion of the optical amplification gain of the optical amplifier body can be compensated by this attenuator. As a result, it is possible to reduce fluctuations in the optical amplification gain caused by minute fluctuations in the wavelength of the signal light input to the optical amplifier main body, and further to reduce distortion of the waveform of the signal light output from the optical fiber amplifier. Can be made

【0012】上記第2の光増幅器では、減衰手段が光増
幅器本体によって光増幅された信号光を、この光増幅器
本体に入力されるべき信号光の波長変動を伴う強度歪み
及びこの光増幅器本体の光増幅利得の波長特性に対して
略相補的な波長特性で減衰して出力するので、光増幅器
本体に入力されるべき信号光の波長変動を伴う強度歪み
及びこの光増幅器本体の光増幅利得の波長依存性の歪み
を補償することができる。この結果、光ファイバ増幅器
から出力される信号光の波形の歪みを低減させることが
できる。
In the second optical amplifier, the signal light optically amplified by the optical amplifier main body by the attenuator is subjected to intensity distortion accompanied by wavelength fluctuation of the signal light to be input to the optical amplifier main body, and the optical amplifier main body. Since the output is attenuated with a wavelength characteristic that is substantially complementary to the wavelength characteristic of the optical amplification gain, the intensity distortion accompanying the wavelength fluctuation of the signal light to be input to the optical amplifier main body and the optical amplification gain of the optical amplifier main body Wavelength-dependent distortion can be compensated. As a result, the distortion of the waveform of the signal light output from the optical fiber amplifier can be reduced.

【0013】[0013]

【実施例】以下、本発明の実施例の構成及び動作につい
て、図3〜図5を参照しつつ簡単に説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration and operation of an embodiment of the present invention will be briefly described below with reference to FIGS.

【0014】図3は、第1実施例に係る光増幅器の構成
を示す図である。信号用のレーザダイオード(LD)2
は、強度変調を受けた電気信号の入力に応じて波長1.
55μm帯光を強度変調した信号光を発生する。LD2
を出射した信号光は、光伝送用の光ファイバ4を通過し
て光増幅器6に入射する。この光増幅器6の内部に設け
られた励起用のLD16は波長1.48μm帯の励起光
を発生する。このLD16から発生した励起光は光ファ
イバカプラ26に入射する。光ファイバカプラ26に入
射した励起光は、入力端側から入射した信号光と合波さ
れたのち、発振を抑えるための光アイソレータ36を通
過し、光増幅用のErドープファイバ46の一端に入射
する。Erドープファイバ46に入射してここで増幅さ
れた信号光は、Erドープファイバ46の他端に設けら
れた歪み補償用の光フィルタ56を通過して出力端から
出射する。
FIG. 3 is a diagram showing the configuration of the optical amplifier according to the first embodiment. Laser diode (LD) for signal 2
Has a wavelength of 1.
Signal light is generated by intensity-modulating 55 μm band light. LD2
The signal light emitted from the laser beam passes through the optical fiber 4 for optical transmission and enters the optical amplifier 6. The pumping LD 16 provided inside the optical amplifier 6 generates pumping light having a wavelength band of 1.48 μm. The excitation light generated from the LD 16 enters the optical fiber coupler 26. The pumping light that has entered the optical fiber coupler 26 is combined with the signal light that has entered from the input end side, and then passes through the optical isolator 36 that suppresses oscillation and enters one end of the Er-doped fiber 46 for optical amplification. To do. The signal light that has entered the Er-doped fiber 46 and is amplified here passes through an optical filter 56 for distortion compensation provided at the other end of the Er-doped fiber 46 and exits from the output end.

【0015】図4は光フィルタ56の機能を説明するた
めの図である。図4(a)は光増幅器6の本体部分1
6、26、36、46の光増幅利得(dB)を示し、図
4(b)は光フィルタ56の透過損失(dB)を示し、
図4(c)は光増幅器6全体での光増幅利得(dB)を
示す。図示のように、光増幅器6の本体部分16、2
6、36、46は波長とともに増加する利得特性を有す
るが、光フィルタ56が同じ傾きで波長とともに減少す
る相補的な透過特性を有するので、光増幅器6全体とし
ての光増幅利得は波長依存性を有しない。つまり、光増
幅器6の本体部分の光増幅利得の波長依存性の歪みが光
フィルタ56の透過特性の波長依存性によって補償され
る。
FIG. 4 is a diagram for explaining the function of the optical filter 56. FIG. 4A shows the body portion 1 of the optical amplifier 6.
6, 26, 36, and 46 show the optical amplification gain (dB), and FIG. 4B shows the transmission loss (dB) of the optical filter 56.
FIG. 4C shows the optical amplification gain (dB) of the entire optical amplifier 6. As shown, the body parts 16, 2 of the optical amplifier 6 are
Although the optical amplifiers 6, 36, and 46 have gain characteristics that increase with wavelength, the optical filter 56 has complementary transmission characteristics that decrease with wavelength at the same inclination, so the optical amplification gain of the optical amplifier 6 as a whole has wavelength dependence. I don't have it. That is, the wavelength-dependent distortion of the optical amplification gain of the body of the optical amplifier 6 is compensated by the wavelength-dependent transmission characteristic of the optical filter 56.

【0016】図3の光ファイバ増幅器の動作について簡
単に説明する。光ファイバカプラ26を介してErドー
プファイバ46の一端に入射した励起光は、Erドープ
ファイバ46に添加したErを励起する。光ファイバカ
プラ26を介してErドープファイバ46の一端に入射
した信号光は、励起されたErの誘導放出によって増幅
される。増幅された信号光は光フィルタ56を経て出力
端に取り出される。この場合、LD2はその入力電流の
振幅の変動にともなってその出力光の波長に変動が生じ
る特性を有するので、強度変調された電流信号の振幅の
変動にともなって信号光の波長に変動が生じる。さら
に、光ファイバ46での光増幅利得に図4(a)のよう
な波長依存性が存在するので、LD2を出射した信号光
は、光ファイバ46中を伝送して増幅される間にその波
形に歪みを受ける。光フィルタ56の透過特性は、図4
(b)のような相補的な波長依存性を有するので、光フ
ァイバ46での光増幅利得の波長依存性に起因する信号
光の波形歪みが補償される。つまり、光増幅器6の本体
部分に入力された信号光の波長の微小変動に起因する光
増幅利得の変動を光フィルタ56の働きによって除去す
ることができ、光増幅器から出力される信号光の波形の
歪みを低減させて光増幅器の発生する高次雑音成分を低
減することができる。
The operation of the optical fiber amplifier shown in FIG. 3 will be briefly described. The excitation light that has entered one end of the Er-doped fiber 46 via the optical fiber coupler 26 excites the Er added to the Er-doped fiber 46. The signal light incident on one end of the Er-doped fiber 46 via the optical fiber coupler 26 is amplified by stimulated emission of excited Er. The amplified signal light passes through the optical filter 56 and is extracted at the output end. In this case, since the LD 2 has a characteristic that the wavelength of its output light varies with the variation of the amplitude of its input current, the wavelength of the signal light varies with the variation of the amplitude of the intensity-modulated current signal. .. Further, since the optical amplification gain in the optical fiber 46 has wavelength dependence as shown in FIG. 4A, the signal light emitted from the LD 2 has its waveform while being transmitted through the optical fiber 46 and being amplified. Subject to distortion. The transmission characteristics of the optical filter 56 are shown in FIG.
Since it has the complementary wavelength dependence as in (b), the waveform distortion of the signal light due to the wavelength dependence of the optical amplification gain in the optical fiber 46 is compensated. That is, the fluctuation of the optical amplification gain caused by the minute fluctuation of the wavelength of the signal light input to the main body of the optical amplifier 6 can be removed by the function of the optical filter 56, and the waveform of the signal light output from the optical amplifier can be removed. It is possible to reduce the distortion of the high-order noise component and the high-order noise component generated by the optical amplifier.

【0017】以下、第2実施例に係る光増幅器について
説明する。第2実施例の光増幅器は、光フィルタ56を
除き図3の光増幅器とほぼ同様の構造を有するので、そ
の構造の説明は省略する。図5は、第2実施例に係る光
増幅器の動作を説明するための図である。図5(a)は
信号用LDのI−L特性を示し、図5(b)は光増幅器
全体の光増幅利得(dB)の波長依存性を示し、図5
(c)は光増幅器から出力される増幅された信号光の波
形を示す。この光増幅器の特徴は、光増幅器6の本体部
分と歪み補償用の光フィルタとを合わせた光増幅器全体
の光増幅利得が波長とともに減少する点である。つま
り、光増幅器の本体部分は波長とともに増加する利得特
性を有するが、歪み補償用の光フィルタがそれ以上の大
きさの負の傾きで波長とともに減少する透過特性を有す
るので、光増幅器全体としての光増幅利得は波長ととも
に漸減する利得特性を有する。つまり、この光増幅器で
は、歪み補償用の光フィルタが、光増幅器本体に入力さ
れるべき信号光のもともと有する強度歪みと光増幅器の
本体部分の有する利得特性とを相補的な透過特性によっ
て補償するので、信号光を発生するLDに起因する信号
光の波形歪み等を光ファイバ増幅器によって低減させる
ことができる。
The optical amplifier according to the second embodiment will be described below. The optical amplifier of the second embodiment has almost the same structure as the optical amplifier of FIG. 3 except for the optical filter 56, and therefore the description of the structure will be omitted. FIG. 5 is a diagram for explaining the operation of the optical amplifier according to the second embodiment. 5A shows the IL characteristic of the signal LD, FIG. 5B shows the wavelength dependence of the optical amplification gain (dB) of the entire optical amplifier, and FIG.
(C) shows the waveform of the amplified signal light output from the optical amplifier. The feature of this optical amplifier is that the optical amplification gain of the entire optical amplifier including the main part of the optical amplifier 6 and the optical filter for distortion compensation decreases with the wavelength. In other words, the main part of the optical amplifier has a gain characteristic that increases with wavelength, but the distortion-compensating optical filter has a transmission characteristic that decreases with wavelength with a negative slope of a larger magnitude. The optical amplification gain has a gain characteristic that gradually decreases with wavelength. In other words, in this optical amplifier, the optical filter for distortion compensation compensates the intensity distortion originally possessed by the signal light to be input to the optical amplifier main body and the gain characteristic of the main body of the optical amplifier by complementary transmission characteristics. Therefore, the optical fiber amplifier can reduce the waveform distortion and the like of the signal light due to the LD that generates the signal light.

【0018】本発明は、上記実施例に限定されるもので
はない。例えば、ErドープファイバのかわりにErを
添加した光導波路を用いることができる。また、Er以
外の活性物質として希土類元素Nd等を用いることがで
きる。また、歪み補償用の光フィルタとして誘電体多層
膜のほかに融着延伸型の光ファイバカプラ等の使用も可
能である。さらに、歪み補償用の光フィルタは、信号光
の波長の光を反射することによってフィルタリングを行
うものであってもよい。
The present invention is not limited to the above embodiment. For example, an Er-doped optical waveguide can be used instead of the Er-doped fiber. Further, a rare earth element Nd or the like can be used as an active substance other than Er. Further, as the optical filter for distortion compensation, it is possible to use a fusion splicing type optical fiber coupler in addition to the dielectric multilayer film. Furthermore, the optical filter for distortion compensation may be one that filters by reflecting light of the wavelength of the signal light.

【0019】[0019]

【発明の効果】以上説明したように、本発明の第1の光
増幅器によれば、光学手段がその入出力の波長特性によ
って光増幅器本体の光増幅利得の波長依存性の歪みを補
償するので、光増幅器本体に入力された信号光の波長の
微小変動に起因する光増幅利得の変動を減少させること
ができ、光増幅器から出力される信号光の波形の歪みを
低減させてノイズの減少を図ることができる。
As described above, according to the first optical amplifier of the present invention, the optical means compensates the wavelength-dependent distortion of the optical amplification gain of the optical amplifier body by the wavelength characteristics of its input and output. , The fluctuation of the optical amplification gain due to the minute fluctuation of the wavelength of the signal light input to the optical amplifier main body can be reduced, and the distortion of the waveform of the signal light output from the optical amplifier can be reduced to reduce the noise. Can be planned.

【0020】また、本発明の第2の光ファイバ増幅器に
よれば、光学手段がその入出力の波長特性によって光増
幅器本体に入力された信号光の有する強度歪み等を補償
するので、信号光を発生するレーザその他の信号光源な
どに起因する信号光の強度歪みを光増幅器によって低減
させてノイズの減少を図ることができる。
Further, according to the second optical fiber amplifier of the present invention, the optical means compensates the intensity distortion or the like of the signal light inputted to the optical amplifier main body by the wavelength characteristic of its input / output, so that the signal light is The optical amplifier can reduce the intensity distortion of the signal light caused by the generated laser or other signal light source, thereby reducing the noise.

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

【図1】信号光源となるレーザダイオードの動作を説明
した図。
FIG. 1 is a diagram illustrating the operation of a laser diode that serves as a signal light source.

【図2】光ファイバ増幅器の波長依存性に起因して発生
する光信号の歪みを示す図。
FIG. 2 is a diagram showing distortion of an optical signal caused by the wavelength dependence of an optical fiber amplifier.

【図3】第1実施例に係る光増幅器の構成を示す図FIG. 3 is a diagram showing a configuration of an optical amplifier according to a first embodiment.

【図4】第1実施例の光増幅器を構成する光フィルタの
機能を説明する図。
FIG. 4 is a diagram for explaining the function of an optical filter that constitutes the optical amplifier of the first embodiment.

【図5】第2実施例の光増幅器を構成する光フィルタの
機能を説明する図。
FIG. 5 is a diagram for explaining the function of an optical filter that constitutes the optical amplifier of the second embodiment.

【符号の説明】[Explanation of symbols]

6…光光増幅器本体、16…光源、46…光ファイバ、
56…光学手段
6 ... Optical amplifier main body, 16 ... Light source, 46 ... Optical fiber,
56 ... Optical means

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 活性物質を添加した光ファイバ及び該活
性物質を励起する光源を有するとともに、入力した信号
光を該光ファイバ内の励起された活性物質によって光増
幅して出力する光増幅器本体と、 前記光増幅器本体によって光増幅された信号光を、該光
増幅器本体の光増幅利得の波長特性に対して略相補的な
波長特性で減衰して出力する減衰手段と、 を備える光増幅器。
1. An optical amplifier main body having an optical fiber doped with an active substance and a light source for exciting the active substance, and for optically amplifying input signal light by the excited active substance in the optical fiber and outputting the amplified signal light. An attenuator for attenuating the signal light optically amplified by the optical amplifier main body with a wavelength characteristic substantially complementary to the wavelength characteristic of the optical amplification gain of the optical amplifier main body, and outputting the optical amplifier.
【請求項2】 活性物質を添加した光導波路装置及び該
活性物質を励起する光源を有するとともに、入力した信
号光を該光導波路装置内の励起された活性物質によって
光増幅して出力する光増幅器本体と、 前記光増幅器本体によって光増幅された信号光を、該光
増幅器本体の光増幅利得の波長特性に対して略相補的な
波長特性で減衰して出力する減衰手段と、 を備える光増幅器。
2. An optical amplifier having an optical waveguide device to which an active substance is added and a light source for exciting the active substance, and optically amplifying input signal light by the excited active substance in the optical waveguide device and outputting the signal light. An optical amplifier comprising: a main body; and an attenuator that attenuates and outputs the signal light optically amplified by the optical amplifier main body with a wavelength characteristic substantially complementary to the wavelength characteristic of the optical amplification gain of the optical amplifier main body. ..
【請求項3】 活性物質を添加した光ファイバ及び該活
性物質を励起する光源を有するとともに、入力した信号
光を該光ファイバ内の励起された活性物質によって光増
幅して出力する光増幅器本体と、 前記光増幅器本体によって光増幅された信号光を、該光
増幅器本体に入力されるべき信号光の波長変動を伴う強
度歪み及び該光増幅器本体の光増幅利得の波長特性に対
して略相補的な波長特性で減衰して出力する減衰手段
と、 を備える光増幅器。
3. An optical amplifier main body which has an optical fiber doped with an active substance and a light source for exciting the active substance, and which amplifies and outputs the input signal light by the excited active substance in the optical fiber. A signal light optically amplified by the optical amplifier body is substantially complementary to a wavelength characteristic of an optical amplification gain of the optical amplifier body and intensity distortion accompanied by wavelength fluctuation of the signal light to be input to the optical amplifier body. Attenuator that attenuates and outputs the light with various wavelength characteristics.
【請求項4】 活性物質を添加した光導波路装置及び該
活性物質を励起する光源を有するとともに、入力した信
号光を該光導波路装置内の励起された活性物質によって
光増幅して出力する光増幅器本体と、 前記光増幅器本体によって光増幅された信号光を、該光
増幅器本体に入力されるべき信号光の波長変動を伴う強
度歪み及び該光増幅器本体の光増幅利得の波長特性に対
して略相補的な波長特性で減衰して出力する減衰手段
と、 を備える光増幅器。
4. An optical amplifier having an optical waveguide device to which an active substance is added and a light source for exciting the active substance, and optically amplifying input signal light by the excited active substance in the optical waveguide device and outputting the signal light. A main body, and the signal light optically amplified by the optical amplifier main body, with respect to the intensity distortion accompanying the wavelength fluctuation of the signal light to be input to the optical amplifier main body and the wavelength characteristic of the optical amplification gain of the optical amplifier main body An optical amplifier comprising: an attenuator that attenuates and outputs a complementary wavelength characteristic.
JP30050891A 1991-11-15 1991-11-15 Optical amplifier Pending JPH05136512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30050891A JPH05136512A (en) 1991-11-15 1991-11-15 Optical amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30050891A JPH05136512A (en) 1991-11-15 1991-11-15 Optical amplifier

Publications (1)

Publication Number Publication Date
JPH05136512A true JPH05136512A (en) 1993-06-01

Family

ID=17885664

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30050891A Pending JPH05136512A (en) 1991-11-15 1991-11-15 Optical amplifier

Country Status (1)

Country Link
JP (1) JPH05136512A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07226558A (en) * 1993-11-18 1995-08-22 Matsushita Electric Ind Co Ltd Optical fiber amplifying equipment and optical fiber transmission system using the same
US5812710A (en) * 1996-02-07 1998-09-22 Fujitsu Limited Apparatus and method for optical equalization and amplification
JP2010140046A (en) * 2010-01-29 2010-06-24 Fujitsu Optical Components Ltd Optical amplifier system and optical variable attenuator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07226558A (en) * 1993-11-18 1995-08-22 Matsushita Electric Ind Co Ltd Optical fiber amplifying equipment and optical fiber transmission system using the same
JP2742513B2 (en) * 1993-11-18 1998-04-22 松下電器産業株式会社 Optical fiber amplifier and optical fiber transmission system using it
US5812710A (en) * 1996-02-07 1998-09-22 Fujitsu Limited Apparatus and method for optical equalization and amplification
JP2010140046A (en) * 2010-01-29 2010-06-24 Fujitsu Optical Components Ltd Optical amplifier system and optical variable attenuator

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