JPS61285414A - Optical demultiplexer - Google Patents
Optical demultiplexerInfo
- Publication number
- JPS61285414A JPS61285414A JP12732185A JP12732185A JPS61285414A JP S61285414 A JPS61285414 A JP S61285414A JP 12732185 A JP12732185 A JP 12732185A JP 12732185 A JP12732185 A JP 12732185A JP S61285414 A JPS61285414 A JP S61285414A
- Authority
- JP
- Japan
- Prior art keywords
- light
- wavelength
- wavelength filter
- optical demultiplexer
- optical
- 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.)
- Granted
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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
-
- 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
-
- 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 Couplings Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
受光面にそれぞれ異なる波長の光を透過する波長フィル
タを設けた複数の光電検出器を、光ビームを中心として
対称に配設して、構成素子の固定が容易で、且つ調整作
業を殆ど必要としない光分波器を提供する。[Detailed Description of the Invention] [Summary] A plurality of photoelectric detectors each having a wavelength filter that transmits light of a different wavelength on the light receiving surface are arranged symmetrically with respect to a light beam, and the fixing of the component elements is achieved. To provide an optical demultiplexer that is easy and requires almost no adjustment work.
本発明は、光通信に使用する光分波器の改良に関する。 The present invention relates to improvements in optical demultiplexers used in optical communications.
光通信システムにおいても、他の伝送システムと同様に
伝送路（光ファイバ等）を有効に利用するために、波長
の異なる信号を多重化して伝送している。したがって、
受信側では光分波器を設置して、信号を分類する必要が
ある。In optical communication systems as well as other transmission systems, signals with different wavelengths are multiplexed and transmitted in order to effectively utilize transmission paths (such as optical fibers). therefore,
On the receiving side, it is necessary to install an optical demultiplexer to classify the signals.
光通信システムの実用化に伴い、構成が簡単で、且つ構
成素子の調整の容易な低コストな光分波器が要望されて
いる。With the practical use of optical communication systems, there is a demand for low-cost optical demultiplexers with a simple configuration and easy adjustment of component elements.
第５図は従来の光分波器の１例を示す構成図であって、
ガラス基板１の表面には波長フィルタ２が接着されてい
る。この波長フィルタ２は、透明板２への表面に所望の
フィルタ膜２Ｂを形成したもので、例えば波長λ１の光
を反射し、波長λ２の光を透過する波長フィルタである
。FIG. 5 is a configuration diagram showing an example of a conventional optical demultiplexer,
A wavelength filter 2 is adhered to the surface of the glass substrate 1. This wavelength filter 2 has a desired filter film 2B formed on the surface of the transparent plate 2, and is a wavelength filter that reflects light with a wavelength λ1 and transmits light with a wavelength λ2, for example.
光ファイバ３は波長λ１．λ２の多重化された光信号を
伝送する伝送路である。The optical fiber 3 has a wavelength λ1. This is a transmission line that transmits multiplexed optical signals of λ2.
光ファイバ３を波長フィルタ２に対して所望の角度傾斜
して設置し、信号光の光ビームを、斜めに波長フィルタ
２に投射している。The optical fiber 3 is installed to be inclined at a desired angle with respect to the wavelength filter 2, and a light beam of signal light is projected onto the wavelength filter 2 obliquely.
そして光ファイバ３の光軸上でガラス基板ｌの反対側に
光電検出器５を配設し、反射光の方向に光電検出器４を
配設しである。A photoelectric detector 5 is disposed on the optical axis of the optical fiber 3 on the opposite side of the glass substrate l, and a photoelectric detector 4 is disposed in the direction of the reflected light.
上述のように光分波器が構成されているので、波長λ、
で光ファイバ３により伝送された信号光は、波長フィル
タ２で反射して、光電検出器４に投射される。よって波
長λ１の信号光は、光電検出器４で電気信号に変換し取
出すことができる。Since the optical demultiplexer is configured as described above, the wavelength λ,
The signal light transmitted through the optical fiber 3 is reflected by the wavelength filter 2 and projected onto the photoelectric detector 4 . Therefore, the signal light having the wavelength λ1 can be converted into an electrical signal by the photoelectric detector 4 and extracted.
また、波長λ２で伝送された信号光は、波長フィルタ２
を透過して、光電検出器５に投射される。In addition, the signal light transmitted at wavelength λ2 is transmitted to wavelength filter 2.
and is projected onto the photoelectric detector 5.
よって、波長λ２の信号光は、光電検出器５で電気信号
に変換し取出すことができる。Therefore, the signal light having the wavelength λ2 can be converted into an electrical signal by the photoelectric detector 5 and extracted.
しかしながら上記従来の光分波器は、光ファイバ３．光
電検出器４，５をそれぞれ波長フィルタ２に対して斜め
に配設し、光電検出器４．５の受光量が最大となるよう
に、角度１位置を調整しなければならない。However, the above-mentioned conventional optical demultiplexer has only three optical fibers. The photoelectric detectors 4 and 5 are each disposed diagonally with respect to the wavelength filter 2, and the angle 1 position must be adjusted so that the amount of light received by the photoelectric detectors 4.5 is maximized.
したがって、この調整作業に時間を要し高コストである
ばかりでなく、それぞれの構成素子を固定する収容筐体
の構造が複雑であるという問題点がある。Therefore, there are problems in that this adjustment work not only takes time and is expensive, but also that the structure of the housing housing to which each component is fixed is complicated.
上記従来の問題点を解決するため本発明は、例えば２つ
の信号に分波する場合には、第１図に示すように、投射
される光ビーム９中心にして対称に、光電検出器１０＾
、 ＩＯＢをを配設し、光電検出器１０Ａ 、ＩＯＢの
それぞれの受光面に互いに異なる波長の光を透過し、他
の波長の光を反射する波長フィルタＩＩＡと波長フィル
タＩＩＢとを設けるようにしたものである。In order to solve the above conventional problems, the present invention provides, for example, when splitting into two signals, as shown in FIG.
, an IOB is arranged, and a photoelectric detector 10A and a wavelength filter IIA and a wavelength filter IIB that transmit light of different wavelengths and reflect light of other wavelengths are provided on the respective light receiving surfaces of the IOB. It is something.
上記本発明の手段によれば、それぞれの光電検出器は、
対称に配設すればよいので、組立てが筒車であり、また
組合わせた対称点近傍に光ビームを投射すれば良いので
、調整作業を殆ど必要としない。According to the above means of the present invention, each photoelectric detector is
Since they only need to be arranged symmetrically, the assembly is an hour wheel, and the light beam can be projected near the combined symmetrical point, so almost no adjustment work is required.
以下図示実施例により、本発明を具体的に説明する。 The present invention will be specifically explained below with reference to illustrated examples.
第１図は本発明の１実施例の構成図で、（ａ）は側面図
、（ｂ）は平面図、第２図は特性図、第３図は他の実施
例の構成図、第４図はその他の一つの実施例の構成図で
ある。Fig. 1 is a block diagram of one embodiment of the present invention, (a) is a side view, (b) is a plan view, Fig. 2 is a characteristic diagram, Fig. 3 is a block diagram of another embodiment, and Fig. 4 is a block diagram of one embodiment of the present invention. The figure is a configuration diagram of another embodiment.
第１図において、２つの同形状の半円形の光電検出器（
例えばフォトダイオード等のような受光素子） ＩＯＡ
、 ＩＯＢが、弦部が密接して円形に配設−されてい
る。In Figure 1, two semicircular photodetectors of the same shape (
For example, a light receiving element such as a photodiode, etc.) IOA
, IOBs are arranged in a circular manner with string parts closely spaced.
この光電検出器１０Ａの受光面には、第２図の特性図の
点線Ａで示すように、波長λ１の光を透過し、波長λ２
の光を反射する波長フィルタＩＩＡが設けられている。As shown by the dotted line A in the characteristic diagram of FIG.
A wavelength filter IIA is provided to reflect the light.
また、他方の光電検出器１０Ｂの受光面には、第２図の
特性図の実線Ｂで示すように、波長λ１の光を反射し、
波長λ２の光を透過する波長フィルタＩＩＲが設けられ
ている。In addition, the light receiving surface of the other photoelectric detector 10B reflects light of wavelength λ1, as shown by the solid line B in the characteristic diagram of FIG.
A wavelength filter IIR is provided that transmits light of wavelength λ2.
光ファイバ３には、波長λ１．λ２の多重化された光信
号を伝送されている。そして、光ファイバ３を対称に配
設された光電検出器１０Ａ、 ＩＯＢのほぼ中心線上で
直交するように組立てである。The optical fiber 3 has wavelengths λ1. A multiplexed optical signal of λ2 is transmitted. The optical fiber 3 is assembled so that the photoelectric detectors 10A and 10A, which are arranged symmetrically, are orthogonal to each other approximately on the center line of the IOB.
したがって、光ファイバ３の出射する光ビーム９は、は
ぼ２等分されて、光電検出器１０Ａ、 １０！’ｌに投
射される。Therefore, the light beam 9 emitted from the optical fiber 3 is divided into two equal parts, and the photoelectric detectors 10A, 10! 'l is projected.
上述のように光分波器が構成されているので、波長λ１
で光ファイバ３により伝送された信号光のほぼ半分が、
波長フィルタＩＩＡを透過して光電検出器１０Ａに入射
し、電気信号に変換される。Since the optical demultiplexer is configured as described above, the wavelength λ1
Almost half of the signal light transmitted through the optical fiber 3 is
The light passes through the wavelength filter IIA, enters the photoelectric detector 10A, and is converted into an electrical signal.
また、波長λ２で光ファイバ３により伝送された信号光
のほぼ半分が、波長フィルタＩＩＢを透過して光電検出
器１０Ｂに入射し、電気信号に変換される。Further, approximately half of the signal light transmitted by the optical fiber 3 at wavelength λ2 passes through the wavelength filter IIB, enters the photoelectric detector 10B, and is converted into an electrical signal.
なお、３波長以上多重化された信号を分波するには、波
長数と同数の光電検出器を光ビームに対称に配設し、そ
れぞれの光電検出器の受光面に、所望の波長の透過する
帯域透過フィルタを設ければよい。In addition, in order to demultiplex a signal multiplexed with three or more wavelengths, the same number of photoelectric detectors as the number of wavelengths are arranged symmetrically to the light beam, and the light receiving surface of each photoelectric detector is set so that the desired wavelength is transmitted. What is necessary is to provide a band pass filter.
第３図の光分波器は、角板状の光電検出器１２Ａと１２
８とを約９０度交叉させて、組合わせたもので、光電検
出器１２Ａの受光面には波長λ、の光を透過し、波長λ
２の光を反射する波長フィルタ１１Ａが設けである。ま
た、光電検出器１２Ｂの受光面には、波長λ、の光を反
射し、波長λ２の光を透過する波長フィルタＩＩＢが設
けである。The optical demultiplexer shown in FIG. 3 includes square plate-shaped photoelectric detectors 12A and 12.
8 and are combined at approximately 90 degrees, transmitting light of wavelength λ to the light receiving surface of photoelectric detector 12A, and transmitting light of wavelength λ to the light receiving surface of photoelectric detector 12A.
A wavelength filter 11A that reflects the second light is provided. Furthermore, a wavelength filter IIB is provided on the light-receiving surface of the photoelectric detector 12B, which reflects light with a wavelength λ and transmits light with a wavelength λ2.
このような光分波器は、波長フィルタ１１Ａで反射され
た波長λ２の光は、波長フィルタ１１Ｂに投射され、波
長フィルタＩＩＢを透過して光電検出器１２Ｂで電気信
号に変換される。In such an optical demultiplexer, light having a wavelength λ2 reflected by a wavelength filter 11A is projected onto a wavelength filter 11B, passes through a wavelength filter IIB, and is converted into an electrical signal by a photoelectric detector 12B.
また同様に、波長フィルタＩＩＢに投射され反射した波
長λ、の光は、波長フィルタＩＩＡに投射され、波長フ
ィルタＩＩＡを透過して光電検出器１２Ａで電気信号に
変換される。即ち、第１図のものに比較して効率の良い
光分波器である。Similarly, the light having the wavelength λ that is projected onto the wavelength filter IIB and reflected is projected onto the wavelength filter IIA, passes through the wavelength filter IIA, and is converted into an electrical signal by the photoelectric detector 12A. That is, it is a more efficient optical demultiplexer than the one shown in FIG.
なお、３波長が多重化された信号を分波する交叉形の効
率の良い光分波器を第４図に示す。FIG. 4 shows an efficient cross-type optical demultiplexer that demultiplexes a signal in which three wavelengths are multiplexed.
第４図の光分波器は、光電検出器１４Ａ 、 １４８
。The optical demultiplexer in FIG. 4 includes photoelectric detectors 14A and 148.
.
１４Ｇを３角錐状に配設し、その内面の受光面に、それ
ぞれ所望の波長を透過する帯域透過フィルタ１３４ 、
１３８ 、１３Ｃを設けれたものである。14G are arranged in the shape of a triangular pyramid, and on the inner surface of the light-receiving surface, there are band pass filters 134 that transmit desired wavelengths, respectively.
138 and 13C.
以上説明したように本発明は、所望に対称に配設した光
電検出器の受光面に、所定の波長フィルタを設けたもの
で、構造が簡単で、組立てが容易であり、且つ、調整作
業を殆ど必要としなくて、低コストであるという、実用
上で優れた効果がある。As explained above, the present invention has a predetermined wavelength filter provided on the light-receiving surface of a photoelectric detector arranged symmetrically as desired, and has a simple structure, easy assembly, and requires no adjustment work. It has excellent practical effects in that it requires little and is low cost.
第１図は本発明の１実施例の光分波器の構成図で、（ａ
）は側面図、（ｂ）は平面図、第２図は特性図、
第３図は他の実施例の構成図、
第４図はその他の１実施例の構成図、
第５図は従来の光分波器の１例を示す構成図である。
図において、
１はガラス基板、
２．１１＾、ｌＩＢ、１３Ａ、１３Ｂ、１３Ｃは波長フ
ィルタ、３は光ファイバ、
４．５は光電検出器、
１０Ａ、 ＩＯＢ、 １２Ａ、 １２Ｂ、 １４＾、
１４ｆ１．１４Ｃは光電検出器を示す。
（支）Ｉ
第ｊ＠ 茅２呵
茶 ３ 圓
１４Ａ
第５因
べ因FIG. 1 is a block diagram of an optical demultiplexer according to an embodiment of the present invention, and (a
) is a side view, (b) is a plan view, Fig. 2 is a characteristic diagram, Fig. 3 is a block diagram of another embodiment, Fig. 4 is a block diagram of another embodiment, and Fig. 5 is a conventional FIG. 2 is a configuration diagram showing an example of an optical demultiplexer. In the figure, 1 is a glass substrate, 2.11^, IIB, 13A, 13B, 13C are wavelength filters, 3 is an optical fiber, 4.5 is a photoelectric detector, 10A, IOB, 12A, 12B, 14^,
14f1.14C indicates a photoelectric detector. (branch) I No. j@ Kaya 2-cha 3 En 14A 5th cause
Claims (2)
反射する波長フィルタが、 投射される光ビームを中心にして、対称に配設された複
数の光電検出器のそれぞれの受光面に設けられてなるこ
とを特徴とする光分波器。(1) Wavelength filters that transmit light of different wavelengths and reflect light of other wavelengths are arranged on the light-receiving surfaces of each of the plurality of photoelectric detectors arranged symmetrically with respect to the projected light beam. An optical demultiplexer characterized in that it is provided in.
に投射される如くに、それぞれの前記光電検出器が交叉
してなることを特徴とする特許請求の範囲第１項に記載
の光分波器。(2) Each of the photoelectric detectors is configured to cross each other so that the reflected light of the wavelength filter is projected onto another wavelength filter. Wave equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12732185A JPS61285414A (en) | 1985-06-12 | 1985-06-12 | Optical demultiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12732185A JPS61285414A (en) | 1985-06-12 | 1985-06-12 | Optical demultiplexer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61285414A true JPS61285414A (en) | 1986-12-16 |
| JPS636844B2 JPS636844B2 (en) | 1988-02-12 |
Family
ID=14957037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12732185A Granted JPS61285414A (en) | 1985-06-12 | 1985-06-12 | Optical demultiplexer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61285414A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59166209U (en) * | 1983-04-20 | 1984-11-07 | オムロン株式会社 | Photosensor for optical fiber coupling |
-
1985
- 1985-06-12 JP JP12732185A patent/JPS61285414A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59166209U (en) * | 1983-04-20 | 1984-11-07 | オムロン株式会社 | Photosensor for optical fiber coupling |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS636844B2 (en) | 1988-02-12 |
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