JPS6265530A - Optical transmission system - Google Patents
Optical transmission systemInfo
- Publication number
- JPS6265530A JPS6265530A JP60205063A JP20506385A JPS6265530A JP S6265530 A JPS6265530 A JP S6265530A JP 60205063 A JP60205063 A JP 60205063A JP 20506385 A JP20506385 A JP 20506385A JP S6265530 A JPS6265530 A JP S6265530A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- single mode
- mode optical
- decentralization
- transmission
- 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
Links
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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/2525—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、光ファイバ伝送系特に超広帯域な伝送系に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical fiber transmission system, particularly an ultra-wideband transmission system.
［従来技術とその問題点］
広帯域光通信システム用伝送路としてシングルモード光
ファイバが広く実用化されている。このシングルモード
光ファイバを全波長分散が零となる波長すなわち零分散
波長で用いる場合、伝送帯域は無限大になり、超広帯域
な伝送系が得られる。[Prior art and its problems] Single-mode optical fibers have been widely put into practical use as transmission lines for broadband optical communication systems. When this single mode optical fiber is used at a wavelength where the total wavelength dispersion is zero, that is, a zero dispersion wavelength, the transmission band becomes infinite, and an ultra-wideband transmission system can be obtained.
しかしながら、現在までの時点では、
レーザ光源の発振波長及びシングルモード光ファイバの
零分散波長にばらつきが生じるため、分散特性は大いに
制限されてしまう。However, up to now, the dispersion characteristics are greatly limited due to variations in the oscillation wavelength of the laser light source and the zero dispersion wavelength of the single mode optical fiber.
（２）光通信システムを構成する光・電気変換器。(2) Optical/electrical converters that constitute optical communication systems.
光変調器、電子回路等の個別部品の積み上げ方式により
全体のコストが決まるため、経済性が良くない。このた
め、光・電子集積回路（以下０ＥＩＣと称する）が開発
されているが、一般に０ＥＩＣと通常のシングルモード
光ファイバとでは導波帯域の幅が互いに異なるため結合
損が生じる。Since the overall cost is determined by the stacking method of individual components such as the optical modulator and electronic circuit, it is not economical. For this reason, optoelectronic integrated circuits (hereinafter referred to as 0EICs) have been developed, but in general, 0EICs and ordinary single-mode optical fibers have different waveguide band widths, resulting in coupling loss.
等の問題点があった。There were problems such as.
［発明の目的］
本発明は、前述した従来技術の問題点を解決し、０ＥＩ
Ｇとの結合特性の優れた超広帯域の光伝送系を提供する
ことを目的とする。[Object of the invention] The present invention solves the problems of the prior art described above and achieves 0EI.
The object of the present invention is to provide an ultra-wideband optical transmission system with excellent coupling characteristics with G.
［発明の要点］
すなわち、本発明の要旨は、伝送用長尺光ファイバの両
端に配置された０ＥＩＣと前記伝送用長尺光ファイバと
の間に所定の長さの分散補償用シングルモード光ファイ
バを挿入し、光ファイバ伝送路全体の分散特性を補償し
たことにある。[Summary of the Invention] That is, the gist of the present invention is to provide a single mode optical fiber for dispersion compensation of a predetermined length between the 0EIC arranged at both ends of the long optical fiber for transmission and the long optical fiber for transmission. was inserted to compensate for the dispersion characteristics of the entire optical fiber transmission line.
１要点の補足説明〕
前記分散補償用シングルモード光ファイバとしては、
高ＮＡ型シングルモード光ファイバ
Ｗ型
多重クラッド形 〃
三角コア形
等が用いられるほか、偏波面保存光ファイバも使用可能
である。Supplementary Explanation of 1 Point] As the single mode optical fiber for dispersion compensation, a high NA type single mode optical fiber, a W type multi-clad type, a triangular core type, etc. are used, and a polarization maintaining optical fiber can also be used.
［実施例］
以下、本発明の一例を図を参照しながら詳細に説明する
。[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図は本発明の光伝送系の実施例を示すブロック図で
ある。１は電気信号入力端子、２はＩＣを５個使用した
半導体レーザのパルス駆動回路である。３は第２図（ａ
）に示される断面構造を右回る高ＮＡ（△−１％）細コ
ア（２ａ＝６μｍ）。FIG. 1 is a block diagram showing an embodiment of the optical transmission system of the present invention. 1 is an electric signal input terminal, and 2 is a semiconductor laser pulse drive circuit using five ICs. 3 is shown in Figure 2 (a
) High NA (Δ-1%) thin core (2a = 6 μm) rotating clockwise in the cross-sectional structure shown in ).
外径１２５μｍの分散補償用シングルモード光ファイバ
で、零分散波長１．６μｍ、長さ０．５に霧である。分
散補償用シングルモード光ファイバ３接続部４を介して
通常の１．３μｍ用シングルモードの光ファイバケーブ
ル５（Δ−３％、２ａ＝１０μｍ）と結合される。６は
レンズを２個用いた光結合器であり、１．３μｍ用シン
グルモード光ファイバ５と分散補償用シングルモード光
ファイバ３とを低損失に結合する。It is a single mode optical fiber for dispersion compensation with an outer diameter of 125 μm, a zero dispersion wavelength of 1.6 μm, and a length of 0.5 μm. The dispersion compensating single mode optical fiber 3 is coupled to a normal 1.3 μm single mode optical fiber cable 5 (Δ-3%, 2a=10 μm) via a connecting portion 4. Reference numeral 6 denotes an optical coupler using two lenses, which couples the 1.3 μm single mode optical fiber 5 and the dispersion compensation single mode optical fiber 3 with low loss.
７は光・電気復調器、８は電気信号出力端子である。光
ファイバケーブル５は零分散波長１．３１μｍ、長さ１
５にｍであり、パルス駆動回路２の出力光の波長は１．
３０μｍである。7 is an optical/electrical demodulator, and 8 is an electrical signal output terminal. The optical fiber cable 5 has a zero dispersion wavelength of 1.31 μm and a length of 1
5.m, and the wavelength of the output light of the pulse drive circuit 2 is 1.5m.
It is 30 μm.
以上の構成の光伝送系では伝送路全体の分散はパルス光
源２の出力光の波長１．３０μｍに移る。In the optical transmission system with the above configuration, the dispersion of the entire transmission path shifts to the wavelength of the output light from the pulsed light source 2, which is 1.30 μm.
すなわち、分散補償用シングルモード光ファイバ３を１
にｍ挿入することにより短波側に０．０１μｍシフトし
たことになる。従って、このような光伝送系では事実上
長さに比例するファクタで伝送帯域幅を制限するものは
完全に除去されることから非常に広帯域となる。一方、
０ＥＩＣとしての−Ｊ −
パルス駆動回路２及び光・電気復調器７との結合特性も
改善される。In other words, the single mode optical fiber 3 for dispersion compensation is
By inserting m into the waveform, it is shifted by 0.01 μm to the short wave side. Therefore, in such an optical transmission system, the factor that actually limits the transmission bandwidth by a factor proportional to the length is completely removed, resulting in a very wide band. on the other hand,
The coupling characteristics with the -J- pulse drive circuit 2 and the optical/electrical demodulator 7 as an 0EIC are also improved.
尚、分散補償用シングルモード光ファイバ３として第２
図（ｂ）に示される断面構造を右する偏波面保存光ファ
イバも適している。In addition, the second single mode optical fiber 3 for dispersion compensation
A polarization-maintaining optical fiber having the cross-sectional structure shown in Figure (b) is also suitable.
高ＮＡ、細コアの分散補償用シングルモード光ファイバ
であれば、伝送用長尺光ファイバからの後方散乱ノイズ
を有効に除去することもできる。A single mode optical fiber for dispersion compensation with a high NA and a thin core can also effectively remove backscattered noise from a long optical fiber for transmission.
［発明の効果］
以上実施例に説明したように本発明によれば、シングル
モード光ファイバを用いる光システムの伝送帯域が超広
帯域であり、スパンロスにマージンがあり超大容量の情
報を伝送したい場合に格好となるほか、０ＥＩＣと伝送
用長尺光ファイバの結合特性も改善される。[Effects of the Invention] As explained in the embodiments above, according to the present invention, the transmission band of an optical system using a single-mode optical fiber is an ultra-wide band, and when it is desired to transmit an ultra-large amount of information with a margin for span loss. In addition to this, the coupling characteristics between the 0EIC and the long optical fiber for transmission are also improved.
第１図は本発明の一実施例を示すブロック図。
第２図は本発明適用の分散補償用シングルモード光ファ
イバの横断面図である。
１・・・電気信号入力端子。
２・・・パルス駆動回路（ＯＥＩＣ）。
３・・・分散補償用シングルモード光ファイバ。
４・・・接 続 部。
５・・・光ファイバケーブル。
６・・・光結合器。
７・・・光電気復調器（ＯＥＩＣ）。
８・・・電気信号出力端子。
９・・・コ ア。
１０・・・クラッド。
１１・・・サポート。
１２・・・楕円ジャケット。FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a cross-sectional view of a single mode optical fiber for dispersion compensation to which the present invention is applied. 1... Electric signal input terminal. 2...Pulse drive circuit (OEIC). 3... Single mode optical fiber for dispersion compensation. 4...Connection part. 5...Optical fiber cable. 6... Optical coupler. 7...Optoelectrical demodulator (OEIC). 8... Electric signal output terminal. 9... Core. 10...Clad. 11...Support. 12...Oval jacket.
Claims (1)
ムにおいて、伝送用長尺光ファイバの両端に配置された
電子・光集積回路と前記伝送用長尺光ファイバとの間に
所定の長さの分散補償用シングルモード光ファイバを挿
入し、光ファイバ伝送路全体の分散特性を補償したこと
を特徴とする光伝送系。(1) In an optical communication system using a single mode optical fiber, a predetermined length of dispersion compensation is provided between an electronic/optical integrated circuit placed at both ends of a long transmission optical fiber and the long transmission optical fiber. An optical transmission system characterized by inserting a single mode optical fiber for use in the optical fiber transmission line and compensating the dispersion characteristics of the entire optical fiber transmission line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60205063A JPS6265530A (en) | 1985-09-17 | 1985-09-17 | Optical transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60205063A JPS6265530A (en) | 1985-09-17 | 1985-09-17 | Optical transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6265530A true JPS6265530A (en) | 1987-03-24 |
Family
ID=16500816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60205063A Pending JPS6265530A (en) | 1985-09-17 | 1985-09-17 | Optical transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6265530A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH052876U (en) * | 1991-03-22 | 1993-01-19 | 三菱電機株式会社 | Module extraction tool for electronic devices |
| FR2681202A1 (en) * | 1991-09-06 | 1993-03-12 | Cit Alcatel | OPTICAL COMMUNICATION LINK WITH CORRECTION OF NONLINEAR EFFECTS, AND METHOD FOR PROCESSING AN OPTICAL SIGNAL. |
| JPH06112907A (en) * | 1992-09-29 | 1994-04-22 | Sumitomo Electric Ind Ltd | Optical communication equipment |
| US5675429A (en) * | 1992-06-22 | 1997-10-07 | Nec Corporation | Optical communication transmission system |
-
1985
- 1985-09-17 JP JP60205063A patent/JPS6265530A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH052876U (en) * | 1991-03-22 | 1993-01-19 | 三菱電機株式会社 | Module extraction tool for electronic devices |
| FR2681202A1 (en) * | 1991-09-06 | 1993-03-12 | Cit Alcatel | OPTICAL COMMUNICATION LINK WITH CORRECTION OF NONLINEAR EFFECTS, AND METHOD FOR PROCESSING AN OPTICAL SIGNAL. |
| US5675429A (en) * | 1992-06-22 | 1997-10-07 | Nec Corporation | Optical communication transmission system |
| USRE37621E1 (en) * | 1992-06-22 | 2002-04-02 | Nec Corporation | Optical communication transmission system |
| JPH06112907A (en) * | 1992-09-29 | 1994-04-22 | Sumitomo Electric Ind Ltd | Optical communication equipment |
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