JPS62143005A - Optical demultiplexer - Google Patents

Optical demultiplexer

Info

Publication number
JPS62143005A
JPS62143005A JP28526585A JP28526585A JPS62143005A JP S62143005 A JPS62143005 A JP S62143005A JP 28526585 A JP28526585 A JP 28526585A JP 28526585 A JP28526585 A JP 28526585A JP S62143005 A JPS62143005 A JP S62143005A
Authority
JP
Japan
Prior art keywords
optical
pieces
optical fiber
wavelength
signals
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
JP28526585A
Other languages
Japanese (ja)
Inventor
Kaoru Fukushima
福島　薫
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP28526585A priority Critical patent/JPS62143005A/en
Publication of JPS62143005A publication Critical patent/JPS62143005A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
    • G02B6/2931—Diffractive element operating in reflection
    • 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
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
    • G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
    • G02B6/29313—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide characterised by means for controlling the position or direction of light incident to or leaving the diffractive element, e.g. for varying the wavelength response
    • G02B6/29314—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide characterised by means for controlling the position or direction of light incident to or leaving the diffractive element, e.g. for varying the wavelength response by moving or modifying the diffractive element, e.g. deforming
    • 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
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To improve the profitability by making an optical demultiplexing optical system for constituting an optical demultiplexer, or an output use optical fiber movable, so that optional optical signals whose number is smaller than N pieces can be selected, among N pieces of optical signals whose wavelength has been multiplexed. CONSTITUTION:N pieces of optical signals whose wavelength has been divided and multiplexed, from an input use optical fiber 1 pass through a lens 4, hit against a grating element 5, reflected therein by changing an angle at every wavelength, and one optical signal among them is condensed by a lens 5 and made incident on an output use optical fiber 2. In this state, by rotating the grating element, it becomes possible to make an optical signal of other wavelength incident on the optical fiber 2. Generally, as for the number of optical fibers 2, M pieces being smaller than N are provided, and by a means for rotating the grating element 3, optional M pieces of optical signals, among N pieces of signals can be made incident on the optical fiber 2, and the profitability can be improved.

Description

【発明の詳細な説明】 ［産業上の利用分野１ 本発明は光分波器に関し、特に片方向の波長分割多重光
伝送に使用される光分波器に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to an optical demultiplexer, and more particularly to an optical demultiplexer used for unidirectional wavelength division multiplexed optical transmission.

［従来の技術］ 従来、波長分割多重化されたＮ個の波長の異なる光信号
を分波する場合、入力の１本の光ファイバと、波長分離
する光学系と、出力の複数本の光ファイバからなり、構
造的に固定された光分波器が用いられていた。[Prior Art] Conventionally, when demultiplexing N wavelength-division multiplexed optical signals with different wavelengths, one input optical fiber, a wavelength demultiplexing optical system, and multiple output optical fibers are used. A structurally fixed optical demultiplexer was used.

［解決しようとする問題点］ 上述した従来の光分波器を、加入者系の光通信システム
（同時に複数のＮ個の光信号を必要とせず１Ｍ個の光信
号を選んで使う場合、但しＮ〉Ｍ、例えばＣＡＴＶシス
テムの映像信号の分配系）に用いる場合は、光分波器で
分離された光信号に対して、各々、電気−光変換回路を
設け、電気信号に変換した後、選釈する必要があった。[Problem to be solved] The above-mentioned conventional optical demultiplexer can be used in a subscriber-based optical communication system (when 1M optical signals are selected and used without the need for a plurality of N optical signals at the same time). N>M, for example, when used in a video signal distribution system of a CATV system), an electrical-optical conversion circuit is provided for each optical signal separated by an optical demultiplexer to convert it into an electrical signal, and then It was necessary to make a selection.

この場合には、波長の異なる信号の数に対応する故の電
気−光変換回路が必要となり、経済性を重視する加入者
系システムとしては無駄が多くなるという欠点がある。In this case, an electric-to-optical conversion circuit is required to accommodate the number of signals with different wavelengths, and there is a drawback that there is a lot of waste in a subscriber system where economic efficiency is important.

［問題点を解決するための手段］ 本発明による光分波装置は、Ｎより少ない数のＭ本の出
力用光ファイバと、光学系またはＭ本の出力用光ファイ
バの可動手段とを有し１分離されたＮ個の光信号のうち
の任意のＭ個の光信号を、Ｍ本の出力用光ファイバへ出
射することを特徴とする。[Means for Solving the Problems] The optical demultiplexing device according to the present invention includes M output optical fibers, the number of which is smaller than N, and an optical system or means for moving the M output optical fibers. It is characterized in that any M optical signals out of the N optical signals separated into one signal are emitted to M output optical fibers.

［作用］ 即ち、光分波器の出力側光ファイバの数を信号の数より
も少なくすることによって、それに接続される光−電気
変換回路の数も少なくして経済化を計るものでおる。そ
のために、本発明の光分波装置では分波する光学系また
は出力側光ファイバを可動化することによって、光分波
装置の光出力を少なくすることが可能となった。[Function] That is, by reducing the number of optical fibers on the output side of the optical demultiplexer than the number of signals, the number of optical-to-electrical conversion circuits connected thereto can also be reduced, thereby achieving economy. Therefore, in the optical demultiplexer of the present invention, by mobilizing the demultiplexing optical system or the output optical fiber, it is possible to reduce the optical output of the optical demultiplexer.

［実施例］ 以下図面を用いて本発明の詳細な説明する。[Example] The present invention will be described in detail below using the drawings.

第１図は本発明の一実施例を示す図である。FIG. 1 is a diagram showing an embodiment of the present invention.

人力用光ファイバ１の光軸上にレンズ４が配置され、レ
ンズ４を出る光軸上に回転可能な光信号分波用光学系３
（この場合はグレーティング素子）が配置される。さら
に、この光学系３により反射される光軸上にレンズ５が
配置され、レンズ５を出る光軸上に出力用光ファイバ２
が配置される。レンズ４．５は光ファイバからの光を平
行ビームに変換、またはその逆の作用をする。A lens 4 is arranged on the optical axis of the human-powered optical fiber 1, and an optical signal demultiplexing optical system 3 is rotatable on the optical axis exiting the lens 4.
(in this case, a grating element) is arranged. Further, a lens 5 is placed on the optical axis reflected by this optical system 3, and an output optical fiber 2 is placed on the optical axis exiting the lens 5.
is placed. The lens 4.5 converts the light from the optical fiber into a parallel beam and vice versa.

本実施例では出力用光ファイバが１本の場合を示してあ
り、入力用光ファイバ１からの波長分割多重化されたＮ
個の光信号はレンズ４を通り、グレーティング素子３に
当たり、そこで波長毎に角度を変えて反射され、そのう
ちの１つの光信号がレンズ５により集光され、出力用光
ファイバ２へ入射される。そこでグレーティング素子３
を回転させると、別の波長の光信号を出力用光ファイバ
２へ入射することが可能となる。一般的には、出力用光
ファイバ２の数をＮより少ないＭ本設け、グレーティン
グ素子３を回転させる手段により、Ｎ個の信号のうちか
ら任意のＭ個の光信号を出力用光ファイバ２へ入射する
ことができる。In this embodiment, the case where there is one output optical fiber is shown, and the wavelength division multiplexed N
The optical signals pass through the lens 4 and strike the grating element 3, where they are reflected at different angles for each wavelength, and one of the optical signals is focused by the lens 5 and input to the output optical fiber 2. Therefore, grating element 3
By rotating , it becomes possible to input an optical signal of a different wavelength into the output optical fiber 2 . In general, the number of output optical fibers 2 is less than N, and by means of rotating the grating element 3, any M optical signals from among the N signals are sent to the output optical fiber 2. can be incident.

本実施例は、可動手段が光分岐用の光学系を回転せしめ
る例であるが、グレーティング素子３を固定して、その
回りにレンズ５と共に出力用光ファイバ２を回転させる
可動手段によっても同様の機能が得られる。Although this embodiment is an example in which the movable means rotates the optical system for splitting light, a similar method may be used in which the movable means fixes the grating element 3 and rotates the output optical fiber 2 together with the lens 5 around it. Functionality is obtained.

［発明の効果］ 本発明によれば、光分波器を構成する光分岐用光学系ま
たは出力用光ファイバを可動化することによって、Ｎ個
の波長多重化された光信号のうちの任意の光信号（Ｎよ
りも少ない数）を選択することが可能となり、その結果
、光分波器の後につづく光−電気変換回路の数も減り、
経済化の効果がある。[Effects of the Invention] According to the present invention, by mobilizing the optical branching optical system or the output optical fiber constituting the optical demultiplexer, any of the N wavelength-multiplexed optical signals can be It becomes possible to select optical signals (number less than N), and as a result, the number of optical-to-electrical conversion circuits following the optical demultiplexer is also reduced.
It has an economical effect.

また本発明を用いた光通信システムの例として、主に経
済化が強く要求される光加入者通信システムで、例えば
チャンネルの映像信号を波長分割多重によって、多数の
加入者へ同時に分配伝送するＣＡＴＶシステムがあるが
、この場合には、各加入者へ設置する端末機器の経済化
は、その加入者の数が多いだけに特にその効果が太きく
なる。Further, an example of an optical communication system using the present invention is an optical subscriber communication system that is strongly required to be economical, such as CATV, which simultaneously distributes and transmits channel video signals to a large number of subscribers by wavelength division multiplexing. There is a system, but in this case, the economicalization of terminal equipment installed at each subscriber is especially effective because the number of subscribers is large.

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

第１図は本発明の一実施例を示す構成図である。 １・・・入力用光ファイバ。 ２・・・出力用光ファイバ、 ３・働・光分岐用光学系（グレーティング素子）４．５
−−争レンズ。 代　理　人　　弁理士　内厚　晋５．・　、ｊ・、ｙ＝
、−。FIG. 1 is a block diagram showing an embodiment of the present invention. 1...Input optical fiber. 2... Optical fiber for output, 3. Optical system for working/light branching (grating element) 4.5
--Conflict lens. Representative Patent Attorney Susumu Uchi5.・ ,j・,y=
,-.

Claims (1)

【特許請求の範囲】[Claims] １本の入力用光ファイバから、波長分割多重化された複
数のＮ個の波長の異なる入射光を得て、波長によつて角
度を変えＮ個の光信号として分離する光学系と、その分
離された光信号を出力するための出力用光ファイバを含
む光分波器において、前記Ｎより少ない数のＭ本の出力
用光ファイバと、前記光学系またはＭ本の出力用光ファ
イバの可動手段とを有し、分離された前記Ｎ個の光信号
のうちの任意のＭ個の光信号を、前記Ｍ本の出力用光フ
ァイバへ出射することを特徴とする光分波装置。An optical system that obtains a plurality of N wavelength-division multiplexed incident lights with different wavelengths from a single input optical fiber and separates them into N optical signals by changing the angle depending on the wavelength, and the separation. In the optical demultiplexer including output optical fibers for outputting optical signals, M output optical fibers, the number of which is smaller than the N, and movable means for the optical system or the M output optical fibers are provided. An optical demultiplexing device comprising: an optical demultiplexing device, wherein any M optical signals among the N separated optical signals are emitted to the M output optical fibers.
JP28526585A 1985-12-17 1985-12-17 Optical demultiplexer Pending JPS62143005A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28526585A JPS62143005A (en) 1985-12-17 1985-12-17 Optical demultiplexer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28526585A JPS62143005A (en) 1985-12-17 1985-12-17 Optical demultiplexer

Publications (1)

Publication Number Publication Date
JPS62143005A true JPS62143005A (en) 1987-06-26

Family

ID=17689262

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28526585A Pending JPS62143005A (en) 1985-12-17 1985-12-17 Optical demultiplexer

Country Status (1)

Country Link
JP (1) JPS62143005A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01128007A (en) * 1987-11-12 1989-05-19 Matsushita Electric Ind Co Ltd Optical tuner
JPH01128006A (en) * 1987-11-12 1989-05-19 Matsushita Electric Ind Co Ltd Optical tuner
JPH01172910A (en) * 1987-12-28 1989-07-07 Matsushita Electric Ind Co Ltd Optical tuner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01128007A (en) * 1987-11-12 1989-05-19 Matsushita Electric Ind Co Ltd Optical tuner
JPH01128006A (en) * 1987-11-12 1989-05-19 Matsushita Electric Ind Co Ltd Optical tuner
JPH01172910A (en) * 1987-12-28 1989-07-07 Matsushita Electric Ind Co Ltd Optical tuner

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