JPH01129212A - Bidirectional optical tuner - Google Patents
Bidirectional optical tunerInfo
- Publication number
- JPH01129212A JPH01129212A JP28782487A JP28782487A JPH01129212A JP H01129212 A JPH01129212 A JP H01129212A JP 28782487 A JP28782487 A JP 28782487A JP 28782487 A JP28782487 A JP 28782487A JP H01129212 A JPH01129212 A JP H01129212A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- diffraction grating
- optical
- optical fiber
- half mirror
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 13
- 239000013307 optical fiber Substances 0.000 claims abstract description 27
- 239000012788 optical film Substances 0.000 claims description 2
- 230000007175 bidirectional communication Effects 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000006854 communication Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4246—Bidirectionally operating package structures
-
- 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
- G02B6/29308—Diffractive element having focusing properties, e.g. curved gratings
-
- 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
- G02B6/29395—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 configurable, e.g. tunable or reconfigurable
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、光フアイバ通信において、光波長多重伝送の
受信側に用いる双方向光チューナに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bidirectional optical tuner used on the receiving side of optical wavelength division multiplexing transmission in optical fiber communications.
従来の技術
近年、光波長多重伝送技術は、光フアイバ伝送に・おい
て、一本の光ファイバを有効に活用して、複数の信号を
異なった波長にのせて送り、信号の伝送容量の増大を図
る手段として注目され、利用されている。Conventional technology In recent years, optical wavelength division multiplexing transmission technology has increased the transmission capacity of signals by effectively utilizing a single optical fiber to transmit multiple signals on different wavelengths. It is attracting attention and being used as a means to achieve this goal.
従来、上述の光波長多重伝送においては、受信側では、
光を波長分割するものとして光分波器が用いられていた
。Conventionally, in the above-mentioned optical wavelength division multiplexing transmission, on the receiving side,
Optical demultiplexers were used to split light into wavelengths.
以下、図面を参照しながら、この光分波器の一例につい
て説明する。An example of this optical demultiplexer will be described below with reference to the drawings.
第２図は従来の光分波器を示すものである。第２図にお
いて、２１は平面直線回折格子、２２はレンズ、２３は
入力光ファイバ、２４，２５゜２６．２７．２８は出力
光ファイバ、２９．３０゜３１，３２．３３は光−電気
変換器を示し、前記レンズ２２は前記平面直線回折格子
２１と、前記入力光ファイバ２３および前記出力光ファ
イバ２４．２５，２６，２７．２８の間に配置されてい
る。FIG. 2 shows a conventional optical demultiplexer. In Fig. 2, 21 is a planar linear diffraction grating, 22 is a lens, 23 is an input optical fiber, 24, 25° 26, 27, 28 is an output optical fiber, 29.30° 31, 32.33 is an optical-to-electrical converter. The lens 22 is arranged between the planar linear diffraction grating 21, the input optical fiber 23 and the output optical fiber 24.25, 26, 27.28.
以上のように構成された光分波器について以下その動作
について説明する。The operation of the optical demultiplexer configured as described above will be explained below.
前記入力光ファイバ２３から、５つの異なる波長からな
る光を、前記レンズ２２を介して平面直線回折格子に入
射することによって、前記光は波長分散を受け、波長ご
とに異なる角度で反射されるとともに前記レンズで収束
され、各々波長の異なる光は出力光ファイバ２４，２５
，２６，２７゜２８で受光され光−電気変換器２９，３
０，３１゜３２．３３でそれぞれ電気信号に変換される
。By inputting light consisting of five different wavelengths from the input optical fiber 23 to the plane linear diffraction grating through the lens 22, the light undergoes wavelength dispersion and is reflected at different angles for each wavelength. The lights converged by the lens and having different wavelengths are output to optical fibers 24 and 25.
, 26, 27° 28 and the optical-to-electrical converter 29, 3
0.31 degrees and 32.33 degrees, respectively, are converted into electrical signals.
（たとえば、ｒ１９７８年度電子通信学会技術研究報告
・Ｃ３７８−１６６，３７ページ〜４２ページ」）
発明が解決しようとする問題点
しかしながら上記のような構成では、−度に複数の広帯
域の信号を受信するのには適しているが、何チャンネル
ものテレビ信号を一本の光ファイバで伝送する放送型の
光波長多重伝送のように、−度には一つの信号すなわち
一つの波長しか必要としない場合には、光ファイバおよ
び光−電気変換器は一組あればよく、光−電気変換器の
コストが高いことから、新しい機能の部品がのぞまれて
いた。(For example, 1978 IEICE Technical Research Report C378-166, pages 37-42) Problems to be Solved by the Invention However, with the above configuration, multiple broadband signals are received at a time. However, it is suitable for cases where only one signal, or one wavelength, is required at a time, such as broadcast-type optical wavelength division multiplexing, which transmits many channels of television signals over a single optical fiber. For this, only one set of optical fiber and optical-to-electrical converter is required, and since the cost of the optical-to-electrical converter is high, parts with new functions have been desired.
また、この様な機能に加えて、データなどの信号を送る
双方向通信が可能な新しい部品の開発が望まれていた。In addition to these functions, there was also a desire to develop new parts that could perform two-way communication to send signals such as data.
本発明は上記問題点を考慮し、放送型の光波長多重伝送
に最も適した光受信側の装置となる双方向通信が可能な
双方向光チェーナを提供するものである。The present invention takes the above-mentioned problems into consideration and provides a bidirectional optical chainer capable of bidirectional communication, which is an optical receiving side device most suitable for broadcast type optical wavelength division multiplexing transmission.
問題点を解決するための手段
上記問題点を解決するために本発明の双方向光チューナ
は、一本の入・出力光ファイバと、一個の受光素子と、
前記入・出力光ファイバと一個の受光素子の前方空間に
配置されたレンズと、前記レンズの前方空間に、前記入
・出力光ファイバの光軸に対して斜に配置された回折格
子を存し、前記レンズと回折格子の間にハーフミラ−を
付設し、前記ハーフミラ−の法線を軸として前記光軸に
たいして対称な方向にレンズおよび光源を配置し、前記
回折格子は回転機構を備えたものである。Means for Solving the Problems In order to solve the above problems, the bidirectional optical tuner of the present invention includes one input/output optical fiber, one light receiving element,
A lens arranged in a space in front of the input/output optical fiber and one light receiving element, and a diffraction grating arranged obliquely with respect to the optical axis of the input/output optical fiber in the space in front of the lens. , a half mirror is attached between the lens and the diffraction grating, the lens and the light source are arranged in a direction symmetrical to the optical axis with the normal line of the half mirror as an axis, and the diffraction grating is provided with a rotation mechanism. be.
作用
本発明は上記した構成によって、ホログラフィック、回
折格子に回転機構を持たせることによって、複数の波長
の中から必要とする波長の光だけを、一個の受光素子で
受光することができ、がっ、ハーフミラ−によって上り
の信号を入力ファイバに集光して送ることのできる、間
車な構造を持った双方向光チューナを作成することがで
きる。Effect of the present invention With the above-described configuration, by providing the holographic or diffraction grating with a rotation mechanism, only the light of the required wavelength from among a plurality of wavelengths can be received by a single light receiving element. It is possible to create a bidirectional optical tuner with a sparse structure that can condense the upstream signal to the input fiber using a half mirror and send it to the input fiber.
実施例
以下本発明の一実施例の双方向光チューナについて図面
を参照しながら説明する。EMBODIMENT A bidirectional optical tuner according to an embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明における双方向光チューナを示すもので
ある。第１図においてｌはホログラフィック回折格子を
示す。２はレンズを示す。FIG. 1 shows a bidirectional optical tuner according to the present invention. In FIG. 1, l indicates a holographic diffraction grating. 2 indicates a lens.
前述の構成において、入・出力光ファイバ３がら５つの
異なる信号を、５つの異なる波長からな、る光にのせて
、前記レンズ２を介してホログラフィック回折格子ｌに
斜に入射することによって、前記５つの異なる波長から
なる光は波長分散を受けて波長ごとに異なる角度で反射
されるとともに、レンズ２で集光され、各々波長の異な
る光の中の一つの波長Ｎの光だけが受光素子４の端面上
で焦点を結び、他の波長の光は受光素子４には入射され
ない。In the above-mentioned configuration, by transmitting five different signals from the input/output optical fiber 3 onto light consisting of five different wavelengths and obliquely entering the holographic diffraction grating l via the lens 2, The light consisting of the five different wavelengths undergoes wavelength dispersion and is reflected at different angles for each wavelength, and is condensed by the lens 2, and only the light of one wavelength N among the lights of different wavelengths is transmitted to the light receiving element. The light of other wavelengths is not incident on the light receiving element 4.
従って、他の波長の光を受光する時は、回転機構５を用
いて前記ホログラフインク回折格子を回転させ、所用の
波長の光を受光素子に入射し電気信号に変換する。Therefore, when receiving light of another wavelength, the rotation mechanism 5 is used to rotate the holographic ink diffraction grating, and the light of the desired wavelength enters the light receiving element and is converted into an electrical signal.
このとき、受光素子の形状は矩形にすることによって、
受光する光の波長通過特性は、平坦な特性にすることが
できる。At this time, by making the shape of the light receiving element rectangular,
The wavelength passage characteristics of the received light can be made flat.
一方、上りの信号を送るときは、光源８に電気信号を載
せて、レンズ７を介してハーフミラー６で反射させ、前
記レンズ２を介して入・出力光ファイバ３に集光する。On the other hand, when sending an upward signal, an electric signal is placed on the light source 8, reflected by the half mirror 6 through the lens 7, and condensed into the input/output optical fiber 3 through the lens 2.
前記ハーフミラ−６は、入・出力光ファイバからの波長
の光に対しては透過し、光源からの波長の光に対しては
反射を行うような光学膜が付設されている。また、前記
ハーフミラ−７は固定されており、前記ホログラフイン
ク回折格子１の回転の如何に係わらず信号を送ることが
できる。The half mirror 6 is provided with an optical film that transmits light of the wavelength from the input/output optical fiber and reflects light of the wavelength from the light source. Furthermore, the half mirror 7 is fixed and can send signals regardless of whether the holographic ink diffraction grating 1 rotates.
前記ホログラフィック回折格子の設定角度は、１次回折
光が入射光軸上に戻るいわゆるリトロ−角では、入力光
ファイバおよび出力光ファイバは接して配置することが
でき、小型化の点で有利である。The setting angle of the holographic diffraction grating is the so-called Littrow angle, where the first-order diffracted light returns to the incident optical axis, so that the input optical fiber and the output optical fiber can be disposed in contact with each other, which is advantageous in terms of miniaturization. .
ホログラフインク回折格子は、従来の機械刻線法の回折
格子に比べて容易に作成することができる。Holographic ink diffraction gratings are easier to create than traditional mechanically scored diffraction gratings.
以上のように本実施例によればホログラフィック回折格
子に、回転機構を付けることによって、従来の光分波器
に波長選択効果を持たせることができ、また、ハーフミ
ラ−によって双方向の通信をも可能にする小型で高性能
な光波長多重伝送の新しい機能の部品を提供するもので
ある。As described above, according to this embodiment, by attaching a rotation mechanism to the holographic diffraction grating, a conventional optical demultiplexer can have a wavelength selection effect, and the half mirror allows bidirectional communication. The aim is to provide components with new functions for compact, high-performance optical wavelength division multiplexing transmission.
なお、本実施例では反射型の回折格子について述べたが
、透過型の回折格子やミラー系を含むものについても同
様の効果が得られる。In this embodiment, a reflection type diffraction grating has been described, but similar effects can be obtained with a transmission type diffraction grating or one including a mirror system.
発明の効果
以上のように本発明は、ホログラフィック回折格子に回
転機構を設けることによって、波長選択効果を持たせる
ことができ、また、受光素子に直接に信号光を入射し、
光−電気変換を直接行い、部品点数を凍らしている。ま
た、受光素子の形状は矩形にすることによって、受光す
る光の波長通過特性は、平坦な特性にすることができる
。また、ハーフミラ−によって双方向の通信をも可能に
する、非常に単純な形状を有する光学部材で双方向の光
チューナを構成することができ、放送型光波長多重伝送
に適した新しい光部品を作成することができる。Effects of the Invention As described above, the present invention can provide a wavelength selection effect by providing a rotation mechanism to a holographic diffraction grating, and also allows signal light to be directly input to a light receiving element,
Optical-to-electrical conversion is performed directly, reducing the number of parts. Moreover, by making the shape of the light receiving element rectangular, the wavelength passage characteristics of the received light can be made flat. In addition, a bidirectional optical tuner can be constructed using a very simple optical member that enables bidirectional communication using a half mirror, creating a new optical component suitable for broadcast-type optical wavelength division multiplexing transmission. can be created.
第１図は本発明の実施例における双方向光チューナの平
面図、第２図は従来の光分波器の斜視図である。
１・・・・・・ホログラフィック回折格子、２・・・・
・・レンズ、３・・・・・・入・出力光ファイバ、４・
・・・・・受光素子、５・・・・・・回転機構、６・・
・・・・ハーフミラ−１７・・・・・・レンズ、８・・
・・・・光源。
代理人の氏名 弁理士 中尾敏男 はか１名ノ − ホ
ログラフィック回折格子
２− レンズ
３− 人・出力光ファイバ
４−受光＊、）
５− 回に機構
６−バーフミラー
７−・レンスFIG. 1 is a plan view of a bidirectional optical tuner according to an embodiment of the present invention, and FIG. 2 is a perspective view of a conventional optical demultiplexer. 1... Holographic diffraction grating, 2...
...Lens, 3...Input/output optical fiber, 4.
... Light receiving element, 5 ... Rotation mechanism, 6 ...
...half mirror 17...lens, 8...
····light source. Name of agent Patent attorney Toshio Nakao 1 name - Holographic diffraction grating 2 - Lens 3 - Person / Output optical fiber 4 - Light receiving*,) 5 - Mechanism 6 - Barf mirror 7 - Lens
Claims (3)
、前記入・出力光ファイバと一個の受光素子の前方空間
に配置されたレンズと、前記レンズの前方空間に、前記
入・出力光ファイバの光軸に対して斜に配置された回折
格子とを有し、前記レンズと回折格子の間にハーフミラ
ーを付設し、前記ハーフミラーの法線を軸として前記光
軸にたいして対称な方向にレンズおよび光源を配置し、
前記回折格子は回転機構を具備して成ることを特徴とす
る双方向光チューナ。(1) One input/output optical fiber, one light receiving element, a lens disposed in a space in front of the input/output optical fiber and one light receiving element, and a lens arranged in a space in front of the lens; a diffraction grating disposed obliquely with respect to the optical axis of the output optical fiber, a half mirror is attached between the lens and the diffraction grating, and the optical fiber is symmetrical with respect to the optical axis with the normal line of the half mirror as an axis. Place the lens and light source in the direction,
A bidirectional optical tuner characterized in that the diffraction grating is equipped with a rotation mechanism.
対しては透過し、光源からの波長の光に対しては反射を
行うような光学膜を具備して成ることを特徴とする特許
請求の範囲第（１）項記載の双方向光チューナ。(2) A patent claim characterized in that the half mirror is equipped with an optical film that transmits light at a wavelength from an input optical fiber and reflects light at a wavelength from a light source. A bidirectional optical tuner according to item (1).
求の範囲第（１）項記載の双方向光チューナ。(3) The bidirectional optical tuner according to claim (1), wherein the light receiving element is rectangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28782487A JPH01129212A (en) | 1987-11-13 | 1987-11-13 | Bidirectional optical tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28782487A JPH01129212A (en) | 1987-11-13 | 1987-11-13 | Bidirectional optical tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01129212A true JPH01129212A (en) | 1989-05-22 |
Family
ID=17722237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28782487A Pending JPH01129212A (en) | 1987-11-13 | 1987-11-13 | Bidirectional optical tuner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01129212A (en) |
-
1987
- 1987-11-13 JP JP28782487A patent/JPH01129212A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3119540B2 (en) | Light tap | |
| CN213659025U (en) | Light receiving assembly and optical module | |
| JP2003202463A (en) | Wavelength multiplex bidirectional optical transmission module | |
| US6381052B1 (en) | Multiplexors with a flat top spectral channel shape | |
| JPS62115403A (en) | Optical tuner | |
| US6553160B2 (en) | Method and apparatus for asymmetric multiplexing and demultiplexing of optical signals utilizing a diffraction grating | |
| JPH01129212A (en) | Bidirectional optical tuner | |
| JPH01142505A (en) | Bidirectional optical tuner | |
| JPH01129211A (en) | Bidirectional optical tuner | |
| JPH01128010A (en) | Bidirectional optical tuner | |
| JPH01128006A (en) | Optical tuner | |
| US6987907B2 (en) | Tunable holographic drop filter with quasi phase-conjugate fiber coupling | |
| JPH01128009A (en) | Optical tuner | |
| JPS62284328A (en) | Optical tuner | |
| JPH01130108A (en) | Optical tuner | |
| JPH01128007A (en) | Optical tuner | |
| JPH01129210A (en) | Optical tuner | |
| JPH01128011A (en) | Optical tuner | |
| JPH01142507A (en) | Optical tuner | |
| JPH01202705A (en) | Optical tuner | |
| JPH01128008A (en) | Optical tuner | |
| JP2931905B2 (en) | Bidirectional light receiving / emitting module | |
| KR100518382B1 (en) | High isolation WDM device using by mirror | |
| JPH01129213A (en) | Optical tuner | |
| JPH0810285B2 (en) | Optical wavelength multiplexer / demultiplexer |