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JPS626209A - Optical demultiplexer - Google Patents

Optical demultiplexer

Info

Publication number
JPS626209A
JPS626209A JP14552085A JP14552085A JPS626209A JP S626209 A JPS626209 A JP S626209A JP 14552085 A JP14552085 A JP 14552085A JP 14552085 A JP14552085 A JP 14552085A JP S626209 A JPS626209 A JP S626209A
Authority
JP
Japan
Prior art keywords
diffraction grating
dielectric material
light
dielectric
optical fiber
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
JP14552085A
Other languages
Japanese (ja)
Inventor
Kiyokazu Hagiwara
萩原　清和
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP14552085A priority Critical patent/JPS626209A/en
Publication of JPS626209A publication Critical patent/JPS626209A/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
    • G02B6/29307—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

PURPOSE:To constitute an optical demultiplexer in an extremely simple shape by using a plane curved diffraction grating. CONSTITUTION:A dielectric 1 where the plane curved diffraction grating have curved grating grooves formed in one surface of a plane reflecting plate so as to have light converging effect, and is provided with a metallic film 15 so as to make the plane curved diffraction grating reflective. End parts of optical fibers 3, 4, 5, 6, 7, and 8 are inserted into recessed parts 9, 10, 11, 12, 13, and 14 formed in one end surface of a transparent prismatic dielectric 2, and the prismatic dielectric 2 and optical fibers 3, 4, 5, 6, 7, and 8 are united together by using a material whose refractive index is nearly equal to that of said optical fibers. Light having five different wavelengths is made incident from the input optical fiber 3 and passed through said dielectric 2, and this light is wavelength- dispered by a dielectric where a plane curved diffraction grating is formed, reflected by the metallic film 9 at different angles corresponding to the wavelengths, and converged by the plane curved diffraction grating 1, so that light beams having the mutually different wavelengths are photodetected by the optical fibers 4, 5, and 6.

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 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
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。BACKGROUND OF THE INVENTION 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は透明々誘電体、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１３．１４，１５，１６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.degree. 16 indicates an input optical fiber, and 14.15.degree. 16 indicates an output optical fiber, and the optical fibers 13.14, 15, and 16 are placed in contact with the transparent dielectric material 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々
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収束され
、各々波長の異なる光は出力光ファイバ１４，１５．１
６で受光される。（例えば、「昭和５６年度電子通信学
会光。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. At the same time, the lights are converged by a concave surface, and the lights with different wavelengths are sent to output optical fibers 14, 15.1.
The light is received at 6. (For example, ``1982 Institute of Electronics and Communication Engineers Hikari.

電波部門全国大会」３３−２　４２４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。Problems to be Solved by the Invention However, with the above configuration, it is extremely difficult to create a concave diffraction grating, and the transparent dielectric material Also, in order to bond it to the concave diffraction grating, it is necessary to process it into a convex shape, which has the problem of requiring 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形成した誘電体を用いて、
作製の容い光分波器を提供するものである。The present invention takes the above-mentioned problems into account, and uses a dielectric material formed with a planar curved diffraction grating that is planar and has a light focusing effect.
The present invention provides an optical demultiplexer that is easy to manufacture.

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光分波器は、曲線
状の格子溝を有する平面曲線回折格子を形成した誘電体
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
折格子を形成した誘電体と光ファイバとの間を満たす一
方の端面に凹部を有する透明な誘電体とを回折格子ある
いは凹部を有する面と反対側の面で接合し、かつ、前記
平面曲線回折格子を形成した誘電体の回折格子を有する
面に金属膜を形成して、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
。Means for Solving the Problems In order to solve the above problems, the optical demultiplexer of the present invention includes a dielectric material formed with a planar curved diffraction grating having curved grating grooves, and a dielectric material formed with a planar curved diffraction grating having curved grating grooves. a plurality of optical fibers arranged in a space in front of the diffraction grating so as to receive the light from the diffraction grating, and to connect the dielectric material forming the diffraction grating and the optical fibers. A transparent dielectric material having recesses on one end surface thereof is bonded to a diffraction grating or a surface opposite to the surface having recesses, and a metal is attached to the surface of the dielectric material having the diffraction grating that forms the planar curved diffraction grating. A film is formed, and a plurality of wavelengths are incident on the diffraction grating from one optical fiber via the dielectric, and each of the other optical fibers receives light of different wavelengths diffracted by the plane curved diffraction grating. It is equipped with a structure for receiving light.

作用 本発明は上記した構成によって、平面状で光の集束をも
った曲線回折格子を形成した誘電体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。Effect of the present invention With the above-described configuration, by using a dielectric material having a planar curved diffraction grating that focuses light, the shape of the transparent dielectric material that propagates the light from the optical fiber may also be a planar shape. This makes it possible to realize an optical demultiplexer that has a simple structure and is easy to manufacture.

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形成した
誘電体を示し、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。１５は、前
記平面曲線回折格子を反射型にするための金属膜である
。２は一方の端面に凹部を有する透明な角柱の誘電体を
示し、前記回折格子を形成した誘電体と凹部を有する誘
電体２とを回折格子あるいは凹部を有する面と反対側の
面で接合しである。３は入力光ファイバ、４．５，６，
７．８は出力光ファイバを示し、前記光ファイバ３，４
，５，６，７．８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９，１０，１１．１２，
１３．１４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．了、８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い
る。FIG. 1 shows an optical demultiplexer in an embodiment of the present invention. In FIG. 1, reference numeral 1 indicates a dielectric material on which a planar curved diffraction grating is formed, and curved grating grooves are formed on the surface of a planar reflection plate so as to have a light focusing effect. 15 is a metal film for making the planar curved diffraction grating reflective. 2 shows a transparent prismatic dielectric material having a recessed portion on one end surface, and the dielectric material on which the diffraction grating is formed and the dielectric material 2 having the recessed portions are joined at the surface opposite to the surface having the diffraction grating or the recessed portion. It is. 3 is the input optical fiber, 4.5, 6,
7.8 indicates an output optical fiber, and the optical fibers 3 and 4
, 5, 6, 7.8 are connected to the transparent prismatic dielectric 2.
recesses 9, 10, 11.12, provided on one end surface of
13.14, the transparent prismatic dielectric 2 and the optical fibers 3, 4, 5, 6 . and 8 are joined by a material having approximately the same refractive index as the optical fiber.

また、前記角柱の誘電体１．２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。Further, the refractive index of the prismatic dielectric 1.2 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６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
線回折格子を形成した誘電体によって、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
角度で金属膜９で反射されるとともに、平面曲線回折格
子１で集光され、各々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, the light consisting of six different wavelengths is transmitted from the input optical fiber 3 through the dielectric 2, which forms a plane curved diffraction grating, so that the light consisting of the three different wavelengths undergoes wavelength dispersion. The received light is reflected by the metal film 9 at different angles for each wavelength, and is condensed by the plane curved diffraction grating 1, and the light having different wavelengths is received by the output optical fibers 4, 5.6.

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ため
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、光の伝搬路の役割を果す
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 for forming the diffraction grating can be made flat, and by using the flat curved diffraction grating, light can be The shape of the transparent dielectric material that plays the role of a propagation path can be made into a prismatic shape that is very easy to process, making it easy to manufacture.

また、本実施例では、前記角柱の誘電体の回折格子を有
する面を、端面に凹部を設けた誘電体との接合面になら
ないような構成にしているため、回折格子の接合しの損
傷も少なく、また、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。In addition, in this example, since the surface of the prismatic dielectric material having the diffraction grating is configured so that it does not become a bonding surface with the dielectric material having a recessed portion on the end surface, damage to the bonding of the diffraction grating is avoided. Moreover, by providing a recess and inserting the optical fiber, the optical fiber can be easily coupled to the dielectric material.

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
た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 approximately 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.

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

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・・・・・・平面曲線回折格子を形成した誘電体、２
・・・・・・凹部を有する透明な角柱の誘電体、３・・
・・・・入力光ファイバ、４，５，６，７．８・・・・
・・力比光ファイバ、９，１０，１１．１２，１３．１
４・・・・・・凹部、１６・・・・・・金属膜。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...Dielectric material forming a plane curved diffraction grating, 2
......Transparent prismatic dielectric material with recesses, 3...
...Input optical fiber, 4, 5, 6, 7.8...
...force ratio optical fiber, 9, 10, 11.12, 13.1
4... Concavity, 16... Metal film.

Claims (1)

【特許請求の範囲】[Claims] 曲線状の格子溝を有する平面曲線回折格子を形成した誘
電体と、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
記回折格子を形成した誘電体と光ファイバとの間を満た
す一方の端面に凹部を有する透明な誘電体とを回折格子
あるいは凹部を有する面と反対側の面で接合し、かつ、
前記平面曲線回折格子を形成した誘電体の回折格子を有
する面に金属膜を形成して、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ことを特徴とする光分波器
。a dielectric material formed with a planar curved diffraction grating having curved grating grooves, and arranged in a space in front of the diffraction grating so as to allow light to enter the planar curved diffraction grating and to receive light from the diffraction grating. a transparent dielectric material having a recess on one end surface that fills the gap between the dielectric material forming the diffraction grating and the optical fiber; joined at the surface, and
A metal film is formed on the diffraction grating surface of the dielectric material on which the planar curve diffraction grating is formed, and a plurality of wavelengths are incident on the diffraction grating from one optical fiber through the dielectric material, and each of the other wavelengths is incident on the diffraction grating surface. An optical demultiplexer characterized in that an optical fiber receives light having different wavelengths diffracted by the plane curved diffraction grating.
JP14552085A 1985-07-02 1985-07-02 Optical demultiplexer Pending JPS626209A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14552085A JPS626209A (en) 1985-07-02 1985-07-02 Optical demultiplexer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14552085A JPS626209A (en) 1985-07-02 1985-07-02 Optical demultiplexer

Publications (1)

Publication Number Publication Date
JPS626209A true JPS626209A (en) 1987-01-13

Family

ID=15387125

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14552085A Pending JPS626209A (en) 1985-07-02 1985-07-02 Optical demultiplexer

Country Status (1)

Country Link
JP (1) JPS626209A (en)

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