JPS59185309A - Optical multiplexer/demultiplexer - Google Patents
Optical multiplexer/demultiplexerInfo
- Publication number
- JPS59185309A JPS59185309A JP6020983A JP6020983A JPS59185309A JP S59185309 A JPS59185309 A JP S59185309A JP 6020983 A JP6020983 A JP 6020983A JP 6020983 A JP6020983 A JP 6020983A JP S59185309 A JPS59185309 A JP S59185309A
- Authority
- JP
- Japan
- Prior art keywords
- prism
- light
- filter
- lens
- 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
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
- G02B6/29379—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
-
- 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
- G02B6/29346—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 wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
- G02B6/29362—Serial cascade of filters or filtering operations, e.g. for a large number of channels
- G02B6/29364—Cascading by a light guide path between filters or filtering operations, e.g. fibre interconnected single filter modules
-
- 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
- G02B6/29346—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 wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
- G02B6/2937—In line lens-filtering-lens devices, i.e. elements arranged along a line and mountable in a cylindrical package for compactness, e.g. 3- port device with GRIN lenses sandwiching a single filter operating at normal incidence in a tubular package
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伝送において波長多重伝送を行なう
光合波・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 multiplexer/demultiplexer that performs wavelength multiplexing transmission in optical fiber transmission.
従来例の構成とその問題点
従来この種のものは、第１図に示すように、屈折率分布
形レンズ（以下レンズと呼ぶ）４．６に波長選択フィル
タ８，９を設け、波長選択フィルタ８，９の他面に同一
のレンズ６．７を貼り合わせたレンズ群を図のように配
置し、光ファイバ１からレンズ４へ波長λ１．λ２の光
を入射する。波長選択フィルタ８を透過した波長λ１の
光はレンズ６で集光され、光ファイバ２に入射する。一
方、波長選択フィルタ８で反射した波長λ２と波長λ１
の一部の光は、レンズ４を再び逆に進み、レンズ６に入
射し、もう一つの波長選択フィルタ９を波長λ２の光が
透過し、レンズ７で集光され、波長λ２の光が光ファイ
バ３に入射する。図に示す従来例ではレンズ４．６が光
軸を離して結合・配置されているため、光ファイバ１，
２．３も設計上光軸をは３べ−８・
ずした位置に配置され、従って、レンズの集光能率の低
下や波長選択フィルタの特性がずれてし貰う欠点があり
、更に高価なレンズを４つも使用しなければならない欠
点があった。Configuration of conventional example and its problems Conventionally, as shown in FIG. A lens group in which identical lenses 6 and 7 are bonded to the other surfaces of 8 and 9 is arranged as shown in the figure, and wavelengths λ 1 . Light of λ2 is incident. The light having the wavelength λ1 that has passed through the wavelength selection filter 8 is focused by the lens 6 and enters the optical fiber 2. On the other hand, the wavelength λ2 and the wavelength λ1 reflected by the wavelength selection filter 8
A part of the light travels backward through the lens 4 and enters the lens 6, and the light with the wavelength λ2 passes through another wavelength selection filter 9, is condensed by the lens 7, and the light with the wavelength λ2 becomes the light. It enters fiber 3. In the conventional example shown in the figure, since the lenses 4.6 are coupled and arranged with their optical axes separated, the optical fibers 1,
2.3 is also placed 3-8 degrees away from the optical axis due to its design, which has the drawbacks of reducing the light-gathering efficiency of the lens and shifting the characteristics of the wavelength selection filter, making it an even more expensive lens. The disadvantage was that it required the use of four.
発明の目的
本発明は上記の欠点を除去するもので、光ファイバをレ
ンズの光軸に近づける構造にし、更にレンズの数を２つ
にした光合波・分波器を提供することを目的とするもの
である。Purpose of the Invention The present invention eliminates the above-mentioned drawbacks, and aims to provide an optical multiplexer/demultiplexer that has a structure in which the optical fiber is brought closer to the optical axis of the lens, and further has two lenses. It is something.
発明の構成
本発明は上記の目的を達成するため、ファイバからの先
がレンズによって平行光になるところに第１．第２のプ
リズムを設け、このプリズムに波長選択フィルタを設け
、更に第１のプリズムを通り、波長選択フィルタを透過
した光は第２のプリズムを通り、その後に置かれた反射
鏡により光路を逆行し、光ファイバの近傍に設けられた
光ファイバに集光されるようにし、一方、上記の波長選
択フィルタにより反射した光は第１のプリズムを再び通
り、もう一つのレンズにより他の光ファイバに集光され
るようにしたものであり、このようにして３本の光ファ
イバを各々レンズの光軸近傍に設置し、レンズの数を２
個にしようとするものである。DESCRIPTION OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a first . A second prism is provided, a wavelength selection filter is provided on this prism, and the light that passes through the first prism and passes through the wavelength selection filter passes through the second prism, and then reverses the optical path by a reflecting mirror placed after it. The light is focused on an optical fiber installed near the optical fiber, while the light reflected by the wavelength selection filter passes through the first prism again and is sent to another optical fiber by another lens. In this way, three optical fibers are installed near the optical axis of each lens, reducing the number of lenses to 2.
It is intended to be individualized.
実施例の説明
以下、本発明の一実施例を第２図、第３図に基づいて説
明すると、１１は光ファイバであり、異なった２つの波
長の光λ１．λ２が伝送されている０１２．１３も光フ
ァイバであり、各々の波長の光λ１．λ２に分波された
ものを伝送する０１４，１５はレンズであり、光ファイ
バから出た光を平行光にしたり、逆に光ファイバに集光
するものである０１８．１９は波長選択フィルタ（以下
、フィルりと呼ぶ）であり、異なった２つの波長の光を
反射及び透過させて合波したり分波するものである０第
３図に示すａ、ｂは光源λ１．λ２の分光特性で、ｃ、
ｄはフィルタ１８．１９の分光特性である０２２．２３
はプリズムであり、光はこの間では平行光である０なお
イ１ロ、ハはプリズム２２のプリズム面であり、４１口
はし／ズ１４，１５の光５ペーご゛
軸と直角でハはθの角度を有している０２４は反射鏡で
あり、光を反射させるものである。DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Reference numeral 11 denotes an optical fiber, which transmits light beams λ1. of two different wavelengths. 012.13 through which λ2 is transmitted is also an optical fiber, and each wavelength of light λ1. 014 and 15 are lenses that transmit the demultiplexed light into λ2, and 018 and 19 are wavelength selection filters (hereinafter referred to as . In the spectral characteristics of λ2, c,
d is the spectral characteristic of filter 18.19 022.23
is a prism, and the light is parallel light between them. 024 having an angle of θ is a reflecting mirror that reflects light.
次に以上の構成における動作をまず分岐器として使用す
る場合について第２図に基づいて説明する。光ファイバ
１１に２つの異なる波長λ１．λ２の光が伝送されてい
る。この光束２０がレンズ１４に入射し、プリズム２２
で平行光になる。このプリズム２２の一面に第３図ｄ［
示される特性をもつフィルタ９が光軸２５と角度θ（約
１６°）だけ傾いて置かれている。このフィルタ１９を
透過した光（ここでは２１）はプリズム２３を通り反射
鏡２４で反射され、再びプリズム２３を通りフィルタ１
９を透過した波長λ２の光２１′はプリズム２２を通り
、レンズ１４で集光され光ファイバ１３に入射する。一
方、フィルタ１９で反射した波長λ１の光（ここでは２
σ）はプリズム２２を通り、フィルタ１８を透過してし
／ズ１６で集光され、光ファイバ１２に入射する。ここ
で、フィルタ１８を必要とする理由は、フィルタ１９で
反射した波長成分の中に波長λ２の一部（第３図を例に
すれば６１“
約１０係の反射成分）が含まれているので、」二記フィ
ルタ１９と逆特性のフィルタ１８つまり、第３図のＣに
示すような特性で上記成分を除去するものである。この
ようにして、２つの波長λ１．λ２に分離することがで
きる。Next, the operation of the above configuration when used as a branch will be described based on FIG. 2. The optical fiber 11 has two different wavelengths λ1. Light of λ2 is being transmitted. This light beam 20 enters the lens 14 and prism 22
becomes parallel light. On one surface of this prism 22, as shown in FIG.
A filter 9 having the characteristics shown is placed at an angle θ (approximately 16°) with respect to the optical axis 25. The light (21 in this case) transmitted through this filter 19 passes through a prism 23, is reflected by a reflecting mirror 24, passes through the prism 23 again, and filters 1
The light 21' having the wavelength λ2 that has passed through the optical fiber 9 passes through the prism 22, is focused by the lens 14, and enters the optical fiber 13. On the other hand, the light of wavelength λ1 (here, 2
σ) passes through the prism 22, passes through the filter 18, is focused by the lens 16, and enters the optical fiber 12. Here, the reason why the filter 18 is required is that the wavelength component reflected by the filter 19 includes a part of the wavelength λ2 (reflected component of approximately 61" in FIG. 3). Therefore, a filter 18 with characteristics opposite to those of the filter 19 described above is used to remove the above component with characteristics as shown in C in FIG. In this way, two wavelengths λ1. It can be separated into λ2.
次に、第２図の構成を合波器として使用する場合につい
て述べる。この場合は、２つの異なる波長λ１．λ２の
光ファイバへの入射、出射が前述の場合と逆である（第
２図のに）内の矢印方向で示す）。Next, a case will be described in which the configuration shown in FIG. 2 is used as a multiplexer. In this case, two different wavelengths λ1. The input and output of λ2 into the optical fiber is opposite to the above case (indicated by the direction of the arrow in the box in FIG. 2).
合波器におけるフィルタ１８．１９の役割は、第３図の
２つの波長λ１．λ２の分光特性ａ、ｂの斜線で示す互
いに重複する部分を合波する前に除去することである。The role of the filters 18 and 19 in the multiplexer is to filter the two wavelengths λ1. The purpose is to remove the mutually overlapping portions of the spectral characteristics a and b of λ2 shown by diagonal lines before multiplexing.
その理由は、異なる光源の光で一度重複してし１つだ波
長は、分岐器では分離できないからである。このように
第２図のような構成によって、２波長用の合波器・分波
器として使用することができる。The reason for this is that wavelengths that once overlap in light from different light sources cannot be separated by a splitter. With the configuration shown in FIG. 2, it can be used as a multiplexer/demultiplexer for two wavelengths.
発明の効果
以上のように本発明によれば、光ファイバをレンズの光
軸の近傍に置くことがでさ、従って、集７ベ、−゛
光能率の改良やフィルタの分光特性のずれからの改良が
可能となり、しかも高価なレンズを２個にへらし安価な
プリズムを置くことにより低価格にすることが出来る効
果を有するものである。Effects of the Invention As described above, according to the present invention, it is possible to place the optical fiber near the optical axis of the lens. This has the effect of making it possible to improve the prism, and also to reduce the cost by replacing the expensive lenses with two and replacing them with an inexpensive prism.
第１図は従来の光合波・分波器の要部正面図、第２図は
本発明の一実施例における光合波・分波器の要部正面図
、第３図は分光特性を示す特性図である。
１１．１２．１３・・・・・・光ファイバ、１４．１５
・・・・・レンズ、１８，１９・・・・・・波長選択フ
ィルタ、２２．２３・・・・・プリズム、２４・・・・
・・反射鏡。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名５３
−
ｎ 獣稈家制・ス（馳噌船
賊Figure 1 is a front view of the main parts of a conventional optical multiplexer/demultiplexer, Figure 2 is a front view of the main parts of an optical multiplexer/demultiplexer in an embodiment of the present invention, and Figure 3 is a characteristic showing spectral characteristics. It is a diagram. 11.12.13...Optical fiber, 14.15
... Lens, 18, 19 ... Wavelength selection filter, 22.23 ... Prism, 24 ...
··Reflector. Name of agent: Patent attorney Toshio Nakao and 1 other person53
- n Beast Cultivation Su (Hasiso Ship Pirates)
Claims (1)
イバとを一方の側の焦点面に設けた第１のレンズ系と、
−人力あるいは出力ファイバを一方の側の焦点面に設け
た第２のレンズ系と、前記第１．第２のレンズ系のファ
イバを設けない側の面に配置した第１のプリズムと、光
軸と所望の角度を有した前記第１のプリズムの面に合せ
て設けた第２のプリズムと、前記第１．第２のプリズム
の合せ面に設けた第１の波長選択フィルタと、前記第１
の波長選択フィルタを透過する光路の側で前記第２のプ
リズムの後に設けた反射鏡と、前記第１の波長選択フィ
ルタを反射する光路の側にその光軸とはゾ垂直に設けた
第２の波長選択フィルタを備え、前記第２の波長選択フ
ィルタの後に前記第２のレンズ系を配置したことを特徴
とする光合波・分波器〇 ２べ−・[Claims] A first lens system having an output fiber and an output fiber on one focal plane on one side;
- a second lens system with a manual or output fiber in the focal plane on one side; a first prism disposed on the side of the second lens system on which no fiber is provided; a second prism disposed in alignment with the surface of the first prism having a desired angle with the optical axis; 1st. a first wavelength selection filter provided on the mating surface of the second prism;
a reflecting mirror provided after the second prism on the side of the optical path that passes through the wavelength selection filter; and a second reflecting mirror provided on the side of the optical path that reflects the first wavelength selection filter and perpendicular to its optical axis. An optical multiplexer/demultiplexer 〇2 base, characterized in that the second lens system is arranged after the second wavelength selection filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6020983A JPS59185309A (en) | 1983-04-05 | 1983-04-05 | Optical multiplexer/demultiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6020983A JPS59185309A (en) | 1983-04-05 | 1983-04-05 | Optical multiplexer/demultiplexer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59185309A true JPS59185309A (en) | 1984-10-20 |
Family
ID=13135526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6020983A Pending JPS59185309A (en) | 1983-04-05 | 1983-04-05 | Optical multiplexer/demultiplexer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59185309A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991000535A1 (en) * | 1989-07-04 | 1991-01-10 | British Telecommunications Public Limited Company | A wavelength demultiplexer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5617305A (en) * | 1979-07-20 | 1981-02-19 | Matsushita Electric Ind Co Ltd | Light branching coupler |
| JPS57190919A (en) * | 1981-05-20 | 1982-11-24 | Toshiba Corp | Optical multiplexer and demultiplexer |
-
1983
- 1983-04-05 JP JP6020983A patent/JPS59185309A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5617305A (en) * | 1979-07-20 | 1981-02-19 | Matsushita Electric Ind Co Ltd | Light branching coupler |
| JPS57190919A (en) * | 1981-05-20 | 1982-11-24 | Toshiba Corp | Optical multiplexer and demultiplexer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991000535A1 (en) * | 1989-07-04 | 1991-01-10 | British Telecommunications Public Limited Company | A wavelength demultiplexer |
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