CN1015840B - 用于放大光纤传输线中光信号的装置 - Google Patents
用于放大光纤传输线中光信号的装置Info
- Publication number
- CN1015840B CN1015840B CN90104609A CN90104609A CN1015840B CN 1015840 B CN1015840 B CN 1015840B CN 90104609 A CN90104609 A CN 90104609A CN 90104609 A CN90104609 A CN 90104609A CN 1015840 B CN1015840 B CN 1015840B
- Authority
- CN
- China
- Prior art keywords
- amplifier
- line
- optical fibre
- signal
- optical
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
- G02B6/4208—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback using non-reciprocal elements or birefringent plates, i.e. quasi-isolators
-
- 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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0064—Anti-reflection devices, e.g. optical isolaters
-
- 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- 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
- H01S2301/00—Functional characteristics
- H01S2301/02—ASE (amplified spontaneous emission), noise; Reduction thereof
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Optical Communication System (AREA)
- Lasers (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
公开了一种用于放大光纤传输线中光信号的装置,它包括一光纤放大器和第一、第二光隔离器,光信号经输入光纤线传输入该放大器,并在放大后传入输出光纤线。第一和第二光隔离器设置在光纤放大器和输入、输出线之间,防止噪声光信号从放大器转输到输入线和从输出线传输到放大器。
Description
本发明涉及用于放大光纤传输线中光信号的装置,这类装置包括一个使用中与至少一根输入光纤线和至少一根输出光纤线连接的光纤放大器,光信号通过输入光纤线传输至该放大器,由该光纤放大器放大后传输入输出光纤线。
已知,在光纤通讯中,由于在光纤内发生的不可避免的光损耗,沿着光纤的路径总要产生信号的逐渐衰减。
为此,若要长距离传输信号,就必须根据预定的长度间距把一个或多个放大装置插入该光纤路径中。
目前广泛使用的一种放大装置主要起作光纤放大器的作用,这种放大器在工作时与光纤连接,以便沿这些光纤的路径限定出光信号通过其传输至放大器的输入线和放大后的光信号经其沿光接收器的方向传输的输出线。
目前使用的这些光纤放大器存在着某些缺点,这主要产生于下列事实:到达放大器的不仅仅有待放大的有用信号,而且还有各种各样的噪声信号,这些信号也被放大并重新传输入输出线。
人们发现,相当数量的噪声信号来自输出线,这是由光纤内部不可避免地产生的光散射现象引起的。
更准确地说,一部分形成放大信号的光由于光纤内部发生的光散射现象而损失了。
一部分反向散射的光又回到该放大器,被重新放大后传输入输出
线。
而且,由于放大器的固有特性,人们认为它要发射一定数量的噪声信号,这些信号或传输入输入线,或传输入输出线。
由于上面所述的散射现象,这些噪声信号部分返回到放大器与实际需要传输的有用信号相混合。
由此可知,进入放大器的噪声信号和它们产生的放大结果产生了干涉和差拍现象,对于具有相当高增益值(>15dB)的放大器来说,这些现象能产生幅度大于由该放大器产生的已知噪声的干涉测量噪声。
这就导致沿放大器下行线路,有用信号和噪声之间的比例产生了不希望有的下降。这种信/噪比的下降要靠增加光纤放大器的增益和增加光纤路径中设置的放大器的数量来改善。
在这种情况下,要使有用信号传到远离信号源处的接收器时仍保持充分清晰将非常困难。
由日本专利52-155901和63-219186以及“电子通讯”(Electronics Letters)Vol.24,no.1,第7期,1988.1,第36~38页上可知,在激光器或光半导体放大器中由于放大器端部的反射会出现不稳定并发生振荡。
为了消除这些反射现象,上述专利和论文教导的方法是在半导体激光器上接一光隔离器,来防止由光纤线与装置之间的耦合表面反射的光到达激光器。
在一有源光纤放大器中,光纤线与放大器之间不存在界面,因为这些光纤线是直接焊到放大器的有源光纤上的,所以一般认为没有反射现象。
然而人们发现,在有源光纤放大器中,如果有源光纤没有反射限制装置,则由于发生干涉测量噪声而不可能达到高的放大增益。干涉测量噪声是由于光纤线本身的正向信号和反射信号间的差拍引起的,至少是由于朝向有源光纤的正向信号和反射信号间的差拍引起的。干涉测量噪声的存在对低增益、结构尺寸小的半导体放大器来说不太重要,但对于能达到非常高的增益的有源光纤放大器来说,这就变得十分重要,这种放大器的有源光纤长度在几十米的范围内,这远大于信号产生激光器的相干距离。
在光纤放大器中,问题是要保护放大器光纤以防这种噪声源的干涉,并保持对该有源光纤的反射低于临界值,以便在不危及传输质量的同时维持高的放大增益值。
本发明的主要目的是要解决这些现有技术存在的问题,提供一种能明显防止噪声信号进入光纤放大器的放大装置。
本发明的这一目的和其它目的将在下面的描述中得到更清楚的表达。这是由放大光纤传输线中光信号的装置实现的。该装置的特征为包括设置在所述放大器和输出光纤线之间用于单方向选择的第一装置和在所述放大器和输入光纤线之间用于单方向选择的第二装置,第一装置用于防止来自所述输出光纤线的光噪声信号传输到该放大器,第二装置用于防止来自放大器的噪声信号传输到所述输入线。
进一步的特征和优点将通过对本发明较佳实施例(不是唯一的)的详细描述更好地表达。下面将参考附图进行描述,这只作为无限制作用的实例。图1是实现本发明目的的放大装置的框图,其沿着光纤传输线排列。
图中,参考号1表示按本发明的放大光纤传输线中光信号的装置
整体结构。
放大装置1通常包括一个使用中与至少一根输入光纤线3连接的光纤放大器2,通过输入光纤线3传输由光传输器4发射来的光信号或由置于同一光纤线上行线路的与图中所示类似的放大装置来的光信号。
该放大器2还连接到放大的光信号须传入其中的输出光纤线5,该光信号将通过输出线被传输到光接收器6或传输到与图中所示类似的另一个放大装置中。
根据本发光,放大装置1还包括一设置在光纤放大器2和输出光纤线5之间用于单向选择的第一装置7,以防止来自输出线的噪声光信号传输到放大器,和一个设置在光纤放大器2和输入线3之间用于单方向选择的第二装置8,以防止来自放大器的噪声信号传输到该输入线中。
用于单方向选择的装置7和8最好分别包括至少一个第一光隔离器和至少一个第二光隔离器,两个光隔离器都有低的光反射率。已知这些光隔离器7和8的反射率本身比形成输入线3和输出线5的光纤的雷利散射所引起的反射率低至少10dB。
实现本发明目的的放大装置的工作方式如下。
已知的方式是:放大器2接收来自输入线3的光信号并将此放大后的信号按输出线5的方向传输。
除了上面所述的光信号,放大器还以已知的方式传输其噪声信号。这些噪声信号必然被传入输入线3和输出线5。
本发明由于紧靠着放大器2的上行线路处有第二光隔离器8,这就使上面所述的噪声信号不能进入输入线3。
如果没有所述光隔离器,由于光纤内产生的光散射现象放大后的噪声信号进入输入线3将产生更多的噪声信号,其中的一部分噪声信号就会再次到达放大器2,结果与光传输器4传输来的有用的光信号产生差拍干涉。
本发明的装置在紧靠着放大器2的下行线路处有第一光隔离器7,这就避免了由于光纤内部发生光散射现象而沿输出线5产生的噪声信号到达放大器。如果没有第一光隔离器7,这些噪声信号就会被放大并和放大后的有用信号一起再次传输到输出线5中,因此产生了不希希有的干涉和/或差拍现象。
根据上面的叙述可知,使用本发明的装置,到达输出线5的信号只是由放大器2产生的放大了的有用信号和较少的可以忽略的噪声信号。
因此,本发明的装置实现了提出的目的。如上所述,由于紧靠着放大器的上行线路和下行线路处设置有光隔离器,实现本发明目的的放大装置和现有技术相比能显著地降低进入放大器输出线的噪声信号。
这就进而增加了放大器的有用的增益,并改进了从发射器到互相距离一长矩离处的接收器的光信号传输。
本发明在不偏离同一发明构思的前提下能包括多种变形。
Claims (1)
1、一种用于放大光纤传输线中光信号的装置,包括一个使用中与至少一根输入光纤线和至少一根输出光纤线连接的光纤放大器,光信号通过输入光纤线传输到所述放大器,由其放大后传输入输出光纤线,其特征在于还包括:
设置在所述放大器和输出光纤线之间用于单方向选择的第一装置,以防止噪声光信号从所述输出线传输至放大器;以及
设置在所述放大器和输入光纤线之间用于单方向选择的第二装置,以防止噪声信号从放大器传输到所述输入线;
所述第一和第二选择装置至少分别包括一个第一光隔离器和一个第二光隔离器,所述光隔离器的反射率至少比形成所述输入和输出线的光纤的雷利散低10dB。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8921207A IT1231208B (it) | 1989-07-17 | 1989-07-17 | Unita' per l'amplificazione di segnali luminosi in linee di trasmissione a fibre ottiche. |
IT21207A/89 | 1989-07-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1048961A CN1048961A (zh) | 1991-01-30 |
CN1015840B true CN1015840B (zh) | 1992-03-11 |
Family
ID=11178379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN90104609A Expired CN1015840B (zh) | 1989-07-17 | 1990-07-17 | 用于放大光纤传输线中光信号的装置 |
Country Status (31)
Country | Link |
---|---|
EP (1) | EP0409012B1 (zh) |
JP (1) | JPH03101718A (zh) |
KR (1) | KR0177147B1 (zh) |
CN (1) | CN1015840B (zh) |
AR (1) | AR242686A1 (zh) |
AT (1) | ATE118935T1 (zh) |
AU (1) | AU634794B2 (zh) |
BR (1) | BR9003541A (zh) |
CA (1) | CA2021281C (zh) |
CZ (1) | CZ281336B6 (zh) |
DD (1) | DD301694A9 (zh) |
DE (1) | DE69017108T2 (zh) |
DK (1) | DK0409012T3 (zh) |
ES (1) | ES2071705T3 (zh) |
FI (1) | FI903597A0 (zh) |
HK (1) | HK1000979A1 (zh) |
HU (1) | HU210859B (zh) |
ID (1) | ID1039B (zh) |
IE (1) | IE67282B1 (zh) |
IT (1) | IT1231208B (zh) |
LT (1) | LT3573B (zh) |
LV (1) | LV10818B (zh) |
MX (1) | MX173807B (zh) |
NO (1) | NO303040B1 (zh) |
NZ (1) | NZ234437A (zh) |
PE (1) | PE33590A1 (zh) |
PL (1) | PL167672B1 (zh) |
PT (1) | PT94717B (zh) |
RU (1) | RU2025757C1 (zh) |
SK (1) | SK280814B6 (zh) |
UA (1) | UA24953A (zh) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5210808A (en) * | 1989-07-17 | 1993-05-11 | Pirelli Cavi S.P.A. | Unit for amplifying light signals in optical fiber transmission lines |
DE4222208A1 (de) * | 1992-07-07 | 1994-01-13 | Sel Alcatel Ag | Optisches Nachrichtenübertragungssystem mit optischem Filter zum Schutz vor Riesenimpulsen |
CN111095697A (zh) * | 2017-09-08 | 2020-05-01 | 古河电气工业株式会社 | 光模块 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2201556B2 (zh) * | 1971-09-24 | 1978-11-24 | Siemens Ag | |
JPS52155901A (en) | 1976-06-21 | 1977-12-24 | Nippon Telegr & Teleph Corp <Ntt> | Transmission system for optical fiber |
US4546476A (en) * | 1982-12-10 | 1985-10-08 | The Board Of Trustees Of The Leland Stanford Junior University | Fiber optic amplifier |
US4596048A (en) * | 1983-04-04 | 1986-06-17 | General Electric Company | Optically isolated contention bus |
GB8512980D0 (en) * | 1985-05-22 | 1985-06-26 | Pa Consulting Services | Fibre optic transmissions systems |
JPS63219186A (ja) | 1987-03-09 | 1988-09-12 | Nippon Telegr & Teleph Corp <Ntt> | 光アイソレ−タ内蔵半導体レ−ザ・モジユ−ル |
-
1989
- 1989-07-17 IT IT8921207A patent/IT1231208B/it active
-
1990
- 1990-07-06 EP EP90112920A patent/EP0409012B1/en not_active Revoked
- 1990-07-06 DE DE69017108T patent/DE69017108T2/de not_active Expired - Fee Related
- 1990-07-06 DK DK90112920.5T patent/DK0409012T3/da active
- 1990-07-06 AT AT90112920T patent/ATE118935T1/de not_active IP Right Cessation
- 1990-07-06 ES ES90112920T patent/ES2071705T3/es not_active Expired - Lifetime
- 1990-07-10 NZ NZ234437A patent/NZ234437A/xx unknown
- 1990-07-12 AU AU58952/90A patent/AU634794B2/en not_active Expired
- 1990-07-16 DD DD90342811A patent/DD301694A9/de active Search and Examination
- 1990-07-16 AR AR90317376A patent/AR242686A1/es active
- 1990-07-16 IE IE258490A patent/IE67282B1/en not_active IP Right Cessation
- 1990-07-16 KR KR1019900010776A patent/KR0177147B1/ko not_active IP Right Cessation
- 1990-07-16 RU SU904830505A patent/RU2025757C1/ru active
- 1990-07-16 HU HU904221A patent/HU210859B/hu not_active IP Right Cessation
- 1990-07-16 FI FI903597A patent/FI903597A0/fi not_active Application Discontinuation
- 1990-07-16 NO NO903172A patent/NO303040B1/no not_active IP Right Cessation
- 1990-07-16 PL PL90286078A patent/PL167672B1/pl unknown
- 1990-07-16 UA UA4830505A patent/UA24953A/uk unknown
- 1990-07-16 CA CA002021281A patent/CA2021281C/en not_active Expired - Lifetime
- 1990-07-17 JP JP2189289A patent/JPH03101718A/ja active Pending
- 1990-07-17 BR BR909003541A patent/BR9003541A/pt unknown
- 1990-07-17 PT PT94717A patent/PT94717B/pt not_active IP Right Cessation
- 1990-07-17 CZ CS903536A patent/CZ281336B6/cs not_active IP Right Cessation
- 1990-07-17 PE PE1990172304A patent/PE33590A1/es not_active Application Discontinuation
- 1990-07-17 MX MX021622A patent/MX173807B/es unknown
- 1990-07-17 CN CN90104609A patent/CN1015840B/zh not_active Expired
- 1990-07-17 SK SK3536-90A patent/SK280814B6/sk unknown
-
1991
- 1991-12-12 ID IDP22091A patent/ID1039B/id unknown
-
1993
- 1993-06-30 LV LVP-93-831A patent/LV10818B/en unknown
- 1993-12-15 LT LTIP1608A patent/LT3573B/lt not_active IP Right Cessation
-
1997
- 1997-12-27 HK HK97102627A patent/HK1000979A1/xx not_active IP Right Cessation
Also Published As
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2070194A1 (en) | Polarisation-insensitive amplification device | |
IT1273676B (it) | Sistema di telecomunicazione amplificata a multiplazione a divisione di lunghezza d'onda,con potenza di ricezione equalizzata | |
CA2094870A1 (en) | Optical power limiting amplifier | |
IE64719B1 (en) | Low-noise optical amplification unit with reflection of the pumping power | |
MY108522A (en) | A double-core active-fiber optical amplifier having a wide-band signal wavelength. | |
AU1097792A (en) | Optical-to-electric transducer with extended dynamic range | |
CN1015840B (zh) | 用于放大光纤传输线中光信号的装置 | |
US5210808A (en) | Unit for amplifying light signals in optical fiber transmission lines | |
CA2211838A1 (en) | Dispersion compensation in optical fibre transmission | |
US5204923A (en) | Unit for amplifying light signals in optical fiber transmission lines | |
CA2110191A1 (en) | Optical Amplification System | |
USRE35697E (en) | Unit for amplifying light signals in optical fiber transmission lines | |
CA2061095A1 (en) | Fiber-Optic Amplifier | |
CN1032029C (zh) | 光纤传输线路中放大光的信号元件 | |
CA2035804A1 (en) | Double-core, active fiber optical amplifier having a wide band signal wavelength | |
CA2042987A1 (en) | Unit for amplifying light signals in optical fiber transmission lines | |
JPH0568152U (ja) | 光信号受信装置 | |
WO2001047152A3 (en) | A lossless optical transmission link with raman gain | |
TH11035EX (th) | ชุดอุปกรณ์สำหรับการขยายสัญญาณแสงในสายส่งผ่านเส้นใยทางแสง | |
JPS6118230A (ja) | 光中継器 | |
JPH0491525A (ja) | 双方向光通信方式 | |
JPH01157632A (ja) | 光受信装置 | |
GEP19970780B (en) | Device for amplification of light signals in optical fiber transmission line | |
KR19980067182A (ko) | 광전송장치에서 ds3 선로 보상 회로 | |
JPH01289329A (ja) | エコーキャンセラー回路 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C13 | Decision | ||
GR02 | Examined patent application | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
OR01 | Other related matters | ||
C19 | Lapse of patent right due to non-payment of the annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |