JPS61182003A - Optical demultiplexer - Google Patents
Optical demultiplexerInfo
- Publication number
- JPS61182003A JPS61182003A JP2227085A JP2227085A JPS61182003A JP S61182003 A JPS61182003 A JP S61182003A JP 2227085 A JP2227085 A JP 2227085A JP 2227085 A JP2227085 A JP 2227085A JP S61182003 A JPS61182003 A JP S61182003A
- Authority
- JP
- Japan
- Prior art keywords
- diffraction grating
- optical fiber
- optical
- dielectric
- optical fibers
- 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
-
- 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
- G02B6/29307—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 components assembled in or forming a solid transparent unitary block, e.g. for facilitating component alignment
-
- 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
- G02B6/29379—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)
- Light Guides In General And Applications Therefor (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、光波長分割多重伝
送に用いられる光分波器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical demultiplexer used for optical wavelength division multiplexing transmission in optical fiber communications.
従来の技術
近年、光波長分割多重伝送技術は、光フアイバ伝送にお
いて光ファイバを有効に活用して、伝送容量の増大をは
かる手段として利用されている。2. Description of the Related Art In recent years, optical wavelength division multiplexing transmission technology has been used as a means for increasing transmission capacity by effectively utilizing optical fibers in optical fiber transmission.
以下図面を参照しながら、上述した従来の光分波器の一
例について説明する。An example of the conventional optical demultiplexer mentioned above 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、１１は凹面回折格子、１２は透明な誘電体、１３
は入力光ファイバ、１４，１５゜１６は出力光ファイバ
を示し、前記光ファイバ１３，１４．１６および１６は
、前記透明な誘電体１２に接するように置かれている。FIG. 2 shows a conventional optical demultiplexer. In FIG. 2, 11 is a concave diffraction grating, 12 is a transparent dielectric material, and 13 is a concave diffraction grating.
14, 15 and 16 indicate input optical fibers, and output optical fibers 13, 14, 16 and 16 are placed in contact with the transparent dielectric 12.
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１３から、３つの異なる波長から女
る光を、前記誘電体１２を介して凹面回折格子１１に入
射することによって、前記の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凹面で集束され
、各々の波長の異なる光は出力光ファイバ１４．１６お
よび１６で受光される。（例えば、［昭和５６年度電子
通信学会光・電波部門全国大会 ５３−２４２４ページ
〜４２５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、凹面の回折格子を
作成するのが非常にむずかしく、また、前記透明な誘電
体についても前記凹面回折格子に接合するために、凸面
状に加工を施す必要があり、非常に煩雑な工数を必要と
するという問題を有していた。By inputting light from three different wavelengths from the input optical fiber 13 into the concave diffraction grating 11 via the dielectric 12, the light undergoes wavelength dispersion and is reflected at different angles for each wavelength. The light beams, each having a different wavelength, are received by output optical fibers 14, 16 and 16. (For example, [1981 National Conference of the Optical and Radio Division of the Institute of Electronics and Communication Engineers, pages 53-2424 to 425) Problems to be Solved by the Invention However, with the above configuration, it is very difficult to create a concave diffraction grating. Moreover, it is necessary to process the transparent dielectric material into a convex shape in order to bond it to the concave diffraction grating, which requires a very complicated number of man-hours.
本発明は上記問題点を考慮し、平面でかつ光の集束効果
を有する平面曲線回折格子を用いて、作製の容易な光分
波器を提供するものである。The present invention takes the above-mentioned problems into consideration and provides an optical demultiplexer that is easy to manufacture by using a flat curved diffraction grating that is flat and has a light focusing effect.
問題点を解決するだめの手段
上記問題点を解決するために本発明の光分波器は、平面
反射板の表面に曲線状の格子溝を形成した平面曲線回折
格子と、前記平面曲線回折格子に光を入射するとともに
、前記回折格子からの光を受光するように、前記回折格
子の前方空間に配列される複数の光ファイバを有し、前
記回折格子と光ファイバとの間を満たす透明な誘電体と
を有し、一本の光ファイバから前記誘電体を介して前記
回折格子に複数の波長を入射し、他の各光ファイバが前
記平面曲線回折格子で回折された各々波長の異なる光を
受光するという構成を備えたものである０
作 用
本発明は上記した構成によって、平面状で光の集束効果
をもった曲線回折格子を用いることによって、光ファイ
バからの光を伝搬する透明な誘電体の形状も平面で良く
、簡単な構造をもった作製の容易な光分波器が実現でき
ることとなる。Means for Solving the Problems In order to solve the above problems, the optical demultiplexer of the present invention includes a planar curved diffraction grating in which curved grating grooves are formed on the surface of a planar reflection plate, and the planar curved diffraction grating. a plurality of optical fibers arranged in a space in front of the diffraction grating so as to input light to the diffraction grating and receive light from the diffraction grating; a dielectric material, a plurality of wavelengths are incident on the diffraction grating from one optical fiber via the dielectric material, and each of the other optical fibers is diffracted by the planar curve diffraction grating, each having a different wavelength. According to the above-described structure, the present invention uses a flat curved diffraction grating that has a light focusing effect to transmit light from an optical fiber. The shape of the dielectric material may be flat, and an optical demultiplexer with a simple structure and easy to manufacture can be realized.
実施例
以下本発明の一実施例の光分波器について図面を参照し
ながら説明する。Embodiment An optical demultiplexer according to an embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明の実施例における光分波器を示すもので
ある。第１図において、１は平面曲線回折格子を示し、
平面反射板の表面に光の集束効果を有する様に、曲線状
の格子溝が形成されている。FIG. 1 shows an optical demultiplexer in an embodiment of the present invention. In FIG. 1, 1 indicates a plane curved diffraction grating,
Curved grating grooves are formed on the surface of the plane reflector to have a light focusing effect.
２は透明な角柱の誘電体を示す。３は入力光ファイバ、
４，６．６は出力光ファイバを示し、前記光ファイバ３
，４．５および６の端部は、前記透明な角柱の誘電体２
の一方の端面に設けられた凹部に挿入されており、前記
透明な角柱の誘電体２と光ファイバ３，４，５．６とを
、前記光ファイバとほぼ同一の屈折率を有する物質で接
合されて込る。また、前記角柱の誘電体の屈折率は、前
記光ファイバの屈折率とほぼ同一の値を有する。2 shows a transparent prismatic dielectric. 3 is the input optical fiber,
4, 6.6 indicates an output optical fiber, and the optical fiber 3
, 4.5 and 6 are connected to the transparent prismatic dielectric 2.
The transparent prismatic dielectric 2 and the optical fibers 3, 4, 5.6 are bonded to each other using a material having substantially the same refractive index as the optical fiber. It's crowded. Further, the refractive index of the prismatic dielectric material has approximately the same value as the refractive index of the optical fiber.
一方、平面曲線回折格子１も同様に、光ファイバとほぼ
同一の屈折率を有する物質で透明な誘電体２に接合され
ている。On the other hand, the planar curved diffraction grating 1 is also bonded to a transparent dielectric material 2 made of a material having approximately the same refractive index as the optical fiber.
前述の構成において、前記入力光ファイバ３から３つの
異なる波長からなる光を、前記誘電体２を介して平面曲
線回折格子１に入射することによって、前記３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１．平面曲線回折格子で集光
され、各々の波長の異なる光は出力光ファイバ４，５．
６で受光される。In the above-mentioned configuration, by inputting light having three different wavelengths from the input optical fiber 3 to the plane curved diffraction grating 1 via the dielectric 2, the light having three different wavelengths has no wavelength dispersion. It is reflected at different angles for each wavelength, and 1. The light beams, which are focused by a plane curved diffraction grating and have different wavelengths, are sent to output optical fibers 4, 5 .
The light is received at 6.
以上のように本実施例によれば、曲線回折格子を波長分
散素子として用いることにより、回折格子を形成するだ
めの基板は平面にすることができるとともに、平面曲線
回折格子を利用することにより、光の伝搬路の役割シを
果たす透明な誘電体の形状を、加工の非常に容易な角柱
にすることができ、その製造を容易にするものである。As described above, according to this embodiment, by using a curved diffraction grating as a wavelength dispersion element, the substrate on which the diffraction grating is formed can be made flat, and by using a flat curved diffraction grating, The shape of the transparent dielectric material that serves as a light propagation path can be made into a prismatic shape that is very easy to process, which facilitates its manufacture.
また、本実施例では、前記角柱の誘電体の一方の端面に
凹部を設けて光ファイバを挿入することによって、光フ
ァイバの誘電体への結合を容易にしている。Furthermore, in this embodiment, a concave portion is provided in one end face of the prismatic dielectric body and an optical fiber is inserted into the concave portion, thereby facilitating coupling of the optical fiber to the dielectric body.
さらに、前記角柱の誘電体の屈折率および、光ファイバ
と誘電体および平面曲線回折格子と誘電体とを接合する
だめの物質を光ファイバの屈折率とほぼ同一にすること
によって、各部分での光の損失を極めて小さくすること
によって、損失の少ない光分波器を実現することができ
る。Furthermore, by making the refractive index of the prismatic dielectric material and the material for joining the optical fiber and the dielectric material and the planar curved diffraction grating and the dielectric material almost the same as the refractive index of the optical fiber, the refractive index of each portion can be adjusted. By minimizing optical loss, it is possible to realize an optical demultiplexer with low loss.
発明の効果
以上のように本発明は、平面曲線回折格子を用いること
によって、非常に単純な形状を有する光学部材で光分波
器を構成することができ、光分波器の作製を極めて容易
にすることができる。Effects of the Invention As described above, the present invention allows an optical demultiplexer to be constructed from optical members having a very simple shape by using a plane curved diffraction grating, making it extremely easy to manufacture an optical demultiplexer. It can be done.
第１図は本発明の実施例における光分波器の斜視図、第
２図は従来の光分波器の斜視図である。
１・・・・・・平面曲線回折格子、２・・・・・・透明
な角柱の誘電体、３・・・・・・入力光フィイバ、４，
５．６・・・・・・出力光ファイバ、７，８，９．１０
・・・・・・凹部。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名３、
入力光７？イハパ
４．６．６ 出７１：ｆ：、７アイバ第２図FIG. 1 is a perspective view of an optical demultiplexer according to an embodiment of the present invention, and FIG. 2 is a perspective view of a conventional optical demultiplexer. 1... Planar curved diffraction grating, 2... Transparent prismatic dielectric, 3... Input optical fiber, 4,
5.6... Output optical fiber, 7, 8, 9.10
・・・・・・Concavity. Name of agent: Patent attorney Toshio Nakao and 1 other person3,
Input light 7? Ihapa 4.6.6 Ex 71: f:, 7 Aiba Fig. 2
Claims (3)
面曲線回折格子と、前記平面曲線回折格子に光を入射す
るとともに、前記回折格子からの光を受光するように、
前記回折格子の前方空間に配列される複数の光ファイバ
を有し、前記回折格子と光ファイバとの間を満たす透明
な誘電体とを有し、一本の前記光ファイバから前記誘電
体を介して前記回折格子に複数の波長を入射し、他の各
光ファイバが前記平面曲線回折格子で回折された各々波
長の異なる光を受光することを特徴とする光分波器。(1) A planar curved diffraction grating in which curved grating grooves are formed on the surface of a planar reflector, and a planar curved diffraction grating that allows light to enter the diffraction grating and receives light from the diffraction grating;
A plurality of optical fibers are arranged in a space in front of the diffraction grating, and a transparent dielectric fills the space between the diffraction grating and the optical fibers, and the transmission from one optical fiber through the dielectric is provided. an optical demultiplexer, wherein a plurality of wavelengths are incident on the diffraction grating, and each of the other optical fibers receives light of different wavelengths diffracted by the plane curved diffraction grating.
の誘電体で満たし、前記誘電体の一方の端面に凹部を設
け、前記凹部に前記光ファイバを挿入したことを特徴と
する特許請求の範囲第（１）項記載の光分波器。(2) A patent claim characterized in that a space between the plane curve diffraction grating and the optical fiber is filled with a transparent prismatic dielectric, a recess is provided on one end surface of the dielectric, and the optical fiber is inserted into the recess. The optical demultiplexer according to range (1).
率が光ファイバとほぼ同一の固体の誘電体で満たし、前
記回折格子と前記誘電体、および前記誘電体と前記光フ
ァイバとを、前記光ファイバとほぼ同一の屈折率を有す
る物質で接合したことを特徴とする特許請求の範囲第（
１）項記載の光分波器。(3) Filling the space between the plane curved diffraction grating and the optical fiber with a transparent solid dielectric having a refractive index substantially the same as that of the optical fiber, and connecting the diffraction grating and the dielectric, and the dielectric and the optical fiber, Claim No. 3, characterized in that the optical fiber is joined with a material having substantially the same refractive index as that of the optical fiber.
The optical demultiplexer described in section 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2227085A JPS61182003A (en) | 1985-02-07 | 1985-02-07 | Optical demultiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2227085A JPS61182003A (en) | 1985-02-07 | 1985-02-07 | Optical demultiplexer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61182003A true JPS61182003A (en) | 1986-08-14 |
Family
ID=12078070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2227085A Pending JPS61182003A (en) | 1985-02-07 | 1985-02-07 | Optical demultiplexer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61182003A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5434846A (en) * | 1977-07-14 | 1979-03-14 | Western Electric Co | Method of forming diffraction grating and device therefor |
| JPS5660401A (en) * | 1979-10-22 | 1981-05-25 | Nippon Telegr & Teleph Corp <Ntt> | Optical branching filter |
| JPS588486A (en) * | 1981-07-09 | 1983-01-18 | Nippon Hakuyo Kiki Kaihatsu Kyokai | Bridge construction of ship |
-
1985
- 1985-02-07 JP JP2227085A patent/JPS61182003A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5434846A (en) * | 1977-07-14 | 1979-03-14 | Western Electric Co | Method of forming diffraction grating and device therefor |
| JPS5660401A (en) * | 1979-10-22 | 1981-05-25 | Nippon Telegr & Teleph Corp <Ntt> | Optical branching filter |
| JPS588486A (en) * | 1981-07-09 | 1983-01-18 | Nippon Hakuyo Kiki Kaihatsu Kyokai | Bridge construction of ship |
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