JPH0815582A - Optical bidirectional module - Google Patents
Optical bidirectional moduleInfo
- Publication number
- JPH0815582A JPH0815582A JP14948494A JP14948494A JPH0815582A JP H0815582 A JPH0815582 A JP H0815582A JP 14948494 A JP14948494 A JP 14948494A JP 14948494 A JP14948494 A JP 14948494A JP H0815582 A JPH0815582 A JP H0815582A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical fiber
- lens
- optical
- semiconductor laser
- 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
- G02B6/42—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
- G02B6/29304—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
- G02B6/29311—Diffractive element operating in transmission
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
- Optical Communication System (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、発光素子及び受光素子
と双方向に光信号を伝送する光ファイバとを用いて光双
方向通信をおこなう光双方向用モジュールに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical bidirectional module for performing optical bidirectional communication using a light emitting element and a light receiving element and an optical fiber for bidirectionally transmitting an optical signal.
【0002】[0002]
【従来の技術】従来より、光ファイバを用いて双方向通
信をおこなう場合に、1本の光ファイバで上り下りの両
方の信号を伝送する方法があり、この場合には1本の光
ファイバと発光素子および受光素子の両方が光学的に結
合される必要があるが、この光双方向用モジュールとし
ては、図2に示すように、発光素子12の光はビームス
プリッタまたはハーフプリズム15を通りレンズ14で
集光されて光ファイバ16へと送出される一方、光ファ
イバ16の光はレンズ14を通りビームスプリッタまた
はハーフプリズム15で反射されて受光素子13に入射
するものがある。2. Description of the Related Art Conventionally, there is a method of transmitting both upstream and downstream signals with one optical fiber when performing bidirectional communication using the optical fiber. Both the light emitting element and the light receiving element need to be optically coupled. In this bidirectional optical module, as shown in FIG. 2, the light of the light emitting element 12 passes through a beam splitter or a half prism 15 to form a lens. While the light is condensed by 14 and sent to the optical fiber 16, the light of the optical fiber 16 passes through the lens 14 and is reflected by the beam splitter or the half prism 15 to enter the light receiving element 13.
【0003】しかし、上記図2の構成では、発光素子1
2と受光素子13が直角の位置にあり、光双方向用モジ
ュール全体が大型化してしまうことより、図3に示すよ
うに、回折格子などの偏向素子17のn次光(nは整
数)を用いることにより、発光素子12と受光素子13
を近傍に配設した構成の光双方向用モジュールがある。However, in the structure shown in FIG. 2, the light emitting element 1
2 and the light receiving element 13 are at a right angle position, and the entire module for optical bidirectionalization becomes large. Therefore, as shown in FIG. 3, the nth order light (n is an integer) of the deflection element 17 such as a diffraction grating is transmitted. By using the light emitting element 12 and the light receiving element 13
There is an optical bidirectional module having a structure in which is arranged in the vicinity.
【0004】[0004]
【発明が解決しようとする課題】ところが、図3に示す
ような構成の場合、通常、光ファイバ16の開口数は発
光素子12および受光素子13の開口数よりも小さく、
これを考慮して偏向素子17やレンズ14を配設しない
と、偏向素子17をパターンが細密になり空間的な分解
能が悪くなってしまう場合がある。しかし、従来の光双
方向用モジュールには開口数を考慮して配設することを
具体的に示したものはなかった。However, in the case of the configuration shown in FIG. 3, the numerical aperture of the optical fiber 16 is usually smaller than the numerical apertures of the light emitting element 12 and the light receiving element 13.
If the deflecting element 17 and the lens 14 are not provided in consideration of this, the pattern of the deflecting element 17 becomes fine and the spatial resolution may deteriorate. However, none of the conventional optical bidirectional modules specifically shows the arrangement in consideration of the numerical aperture.
【0005】[0005]
【課題を解決するための手段】本発明は、上記問題に鑑
みてなされたものであり、少なくとも発光素子および受
光素子と、双方向に光信号を伝送する光ファイバとより
なる光双方向用モジュールにおいて、発光素子および受
光素子、光を集光させるレンズ、光を偏向させる偏向素
子、光ファイバの順に配設し、前記発光素子および受光
素子は前記偏向素子のn次光(nは整数)を利用して前
記光ファイバとの間で送信および受信する光双方向用モ
ジュールとしたものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is an optical bidirectional module including at least a light emitting element and a light receiving element, and an optical fiber for bidirectionally transmitting an optical signal. In the above, a light emitting element and a light receiving element, a lens for condensing light, a deflecting element for deflecting light, and an optical fiber are arranged in this order, and the light emitting element and the light receiving element are the nth order light (n is an integer) of the deflecting element. This is an optical bidirectional module that utilizes the optical fiber to transmit and receive.
【0006】なお、本発明の光を集光するレンズは、入
射光を平行光にするレンズと入射光をある1点に集める
レンズの両方を含むものとする。The lens for condensing the light of the present invention includes both a lens for collimating the incident light and a lens for converging the incident light at a certain point.
【0007】[0007]
【作用】本発明によれば、開口数の大きい発光素子およ
び受光素子側にレンズを配設し、開口数の小さい光ファ
イバ側に偏向素子を配設することにより、偏向素子の格
子間隔、あるいは位相分布配列が細密にならず、空間分
解能のよい光双方向用モジュールとなる。According to the present invention, by disposing a lens on the side of a light emitting element and a light receiving element having a large numerical aperture, and arranging a deflecting element on the side of an optical fiber having a small numerical aperture, the lattice spacing of the deflecting elements or The phase distribution array does not become fine, and the optical bidirectional module has good spatial resolution.
【0008】[0008]
【実施例】以下本発明の実施例を図面を用いて説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【0009】図1に示すように、本発明の光双方向用モ
ジュール1は、半導体レーザ2およびフォトダイオード
3、レンズ4、回折格子5、光ファイバ6を順に配設し
てなる。このような構成とすることにより、半導体レー
ザ2より発せられた光信号はレンズ4を通り集光され、
回折格子5を通過した後、0次の回折光のみが光ファイ
バ6に出射される。一方、光ファイバ6を伝送してきた
光信号は、光ファイバ6から出射されて回折格子5を通
過した後、1次の回折光がフォトダイオード3に入射す
ることができるようになる。As shown in FIG. 1, an optical bidirectional module 1 of the present invention comprises a semiconductor laser 2, a photodiode 3, a lens 4, a diffraction grating 5 and an optical fiber 6 which are arranged in this order. With such a configuration, the optical signal emitted from the semiconductor laser 2 is condensed through the lens 4,
After passing through the diffraction grating 5, only the 0th order diffracted light is emitted to the optical fiber 6. On the other hand, the optical signal transmitted through the optical fiber 6 is emitted from the optical fiber 6, passes through the diffraction grating 5, and then the first-order diffracted light can enter the photodiode 3.
【0010】ここで、開口数の大きい半導体レーザから
出射された光を回折格子を用いて偏向するためには、半
導体レーザと回折格子間を狭くし、回折格子の格子間隔
を細密にする必要がある。しかし、本実施例の構成のよ
うに、開口数の大きい半導体レーザ2側にレンズ4を配
設して半導体レーザ2からの出射光が拡散する前に集光
させることにより、半導体レーザ2と回折格子5との相
対的位置の許容範囲が大きくなり、回折格子5の格子間
隔も細密となることを防ぐので、回折格子5の製作が容
易になり、n次光(nは整数)の分解効率がよくなり、
空間的な分解能が向上する。さらに、光ファイバ6への
入射角度が小さいため、光ファイバ6が光軸方向に多少
前後しても受光量の変化が少なく、光ファイバ6の配置
許容範囲が大きくなり、複数の光ファイバを設置する際
でも光ファイバのトレランスが大きく取れるようにな
る。Here, in order to deflect the light emitted from the semiconductor laser having a large numerical aperture by using the diffraction grating, it is necessary to narrow the gap between the semiconductor laser and the diffraction grating and to make the grating spacing of the diffraction grating fine. is there. However, as in the configuration of the present embodiment, by disposing the lens 4 on the side of the semiconductor laser 2 having a large numerical aperture so that the emitted light from the semiconductor laser 2 is condensed before being diffused, the semiconductor laser 2 and the semiconductor laser 2 are diffracted. Since the allowable range of the relative position with respect to the grating 5 is increased and the grating spacing of the diffraction grating 5 is prevented from becoming fine, the diffraction grating 5 is easily manufactured, and the resolution efficiency of the nth-order light (n is an integer) is improved. Has improved,
Spatial resolution is improved. Further, since the incident angle to the optical fiber 6 is small, even if the optical fiber 6 moves back and forth in the optical axis direction, the amount of received light does not change so much, the allowable placement range of the optical fiber 6 increases, and a plurality of optical fibers are installed. Even when doing so, the tolerance of the optical fiber can be largely obtained.
【0011】なお、本実施例では、レンズ4は入射光を
平行光にするレンズを用いて、回折格子5にレンズ作用
を持たせた。これにより、レンズ4と回折格子5間が平
行光となるため、回折格子5の配置許容範囲が大きくな
り、回折格子5は光ファイバ6に対して好ましい位置に
調整させるような移動が可能となる。また、レンズ4と
して入射光を一点に集めるレンズを用いてもよく、この
ようなレンズを用いると、レンズ4と回折格子5との距
離を短くすることができ、光双方向用モジュール全体を
小型化することができる。In this embodiment, the lens 4 is a lens that collimates incident light into parallel light, and the diffraction grating 5 has a lens function. As a result, the light between the lens 4 and the diffraction grating 5 becomes parallel light, so that the allowable placement range of the diffraction grating 5 increases, and the diffraction grating 5 can be moved so as to be adjusted to a preferable position with respect to the optical fiber 6. . A lens that collects incident light at one point may be used as the lens 4, and by using such a lens, the distance between the lens 4 and the diffraction grating 5 can be shortened, and the entire optical bidirectional module can be made compact. Can be converted.
【0012】本実施例では、発光素子として半導体レー
ザ2を用いたが発光ダイオードであってもよく、受光素
子としてフォトダイオード3を用いたが他の受光素子で
あってもよく、偏向素子として回折格子5を用いたがホ
ログラムであってもよく、回折格子5の0次光と1次光
を用いたが他のn次光(nは整数)を使ってもよい。ま
た、光ファイバ6と回折格子5との間にさらに他のレン
ズを配設すると、光ファイバ6と回折格子5の距離を短
くすることができ、光双方向用モジュール1全体をさら
に小型化できる。また、半導体レーザ2とフォトダイオ
ード3とが近傍にあるのでモジュール化することがで
き、光双方向用モジュール1全体をさらに小型化でき
る。In this embodiment, the semiconductor laser 2 is used as the light emitting element, but the light emitting diode may be used, and the photodiode 3 is used as the light receiving element, but another light receiving element may be used, and the diffraction element is used as the diffraction element. Although the grating 5 is used, a hologram may be used. The 0th order light and the 1st order light of the diffraction grating 5 are used, but other nth order light (n is an integer) may be used. Further, by disposing another lens between the optical fiber 6 and the diffraction grating 5, the distance between the optical fiber 6 and the diffraction grating 5 can be shortened, and the entire optical bidirectional module 1 can be further downsized. . Further, since the semiconductor laser 2 and the photodiode 3 are close to each other, they can be modularized, and the optical bidirectional module 1 can be further miniaturized.
【0013】[0013]
【発明の効果】以上説明したように、本発明の光双方向
用モジュールによれば、発光素子および受光素子、光を
集光させるレンズ、光を偏向させる偏向素子、光ファイ
バの順に配設し、前記発光素子および受光素子は前記偏
向素子のn次光(nは整数)を利用して前記光ファイバ
との間で送信および受信することによって、偏向素子の
製作が容易になり、偏向素子の分解効率がよくなり、空
間的な分解能が向上するものとなる。さらに、光ファイ
バや偏向素子の配置許容範囲が大きくなる光双方向用モ
ジュールを提供することができる。As described above, according to the optical bidirectional module of the present invention, the light emitting element and the light receiving element, the lens for condensing the light, the deflecting element for deflecting the light, and the optical fiber are arranged in this order. , The light emitting element and the light receiving element transmit and receive to and from the optical fiber by using the nth-order light (n is an integer) of the deflection element, thereby facilitating the manufacture of the deflection element. The decomposition efficiency is improved and the spatial resolution is improved. Furthermore, it is possible to provide an optical bidirectional module in which the allowable placement range of the optical fiber and the deflection element is increased.
【図1】本発明の光双方向用モジュールを示す構成概略
図である。FIG. 1 is a schematic configuration diagram showing an optical bidirectional module of the present invention.
【図2】従来の光双方向用モジュールを示す構成概略図
である。FIG. 2 is a schematic configuration diagram showing a conventional bidirectional optical module.
【図3】従来の光双方向用モジュールを示す構成概略図
である。FIG. 3 is a schematic configuration diagram showing a conventional bidirectional optical module.
1:光双方向用モジュール 2:半導体レーザ 3:フォトダイオード 4、14:レンズ 5:回折格子 6、16:光ファイバ 12:発光素子 13:受光素子 15:ビームスプリッタまたはハーフプリズム 17:偏向素子 1: Optical bidirectional module 2: Semiconductor laser 3: Photodiode 4, 14: Lens 5: Diffraction grating 6, 16: Optical fiber 12: Light emitting element 13: Light receiving element 15: Beam splitter or half prism 17: Deflection element
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 H04B 10/14 10/04 10/06 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location H04B 10/14 10/04 10/06
Claims (1)
方向に光信号を伝送する光ファイバとよりなる光双方向
用モジュールにおいて、前記発光素子および受光素子、
光を集光させるレンズ、光を偏向させる偏向素子、前記
光ファイバの順に配設し、前記発光素子および受光素子
は前記偏向素子のn次光(nは整数)を利用して前記光
ファイバとの間で送信および受信することを特徴とする
光双方向用モジュール。1. An optical bidirectional module comprising at least a light emitting element and a light receiving element and an optical fiber for bidirectionally transmitting an optical signal, wherein the light emitting element and the light receiving element are provided.
A lens for condensing light, a deflecting element for deflecting light, and the optical fiber are arranged in this order, and the light emitting element and the light receiving element are connected to the optical fiber by using the nth-order light (n is an integer) of the deflecting element. An optical bidirectional module characterized by transmitting and receiving between.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14948494A JPH0815582A (en) | 1994-06-30 | 1994-06-30 | Optical bidirectional module |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14948494A JPH0815582A (en) | 1994-06-30 | 1994-06-30 | Optical bidirectional module |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0815582A true JPH0815582A (en) | 1996-01-19 |
Family
ID=15476168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14948494A Pending JPH0815582A (en) | 1994-06-30 | 1994-06-30 | Optical bidirectional module |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0815582A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000017691A1 (en) * | 1998-09-17 | 2000-03-30 | Matsushita Electric Industrial Co., Ltd. | Coupling lens and semiconductor laser module |
US6236477B1 (en) * | 1999-01-12 | 2001-05-22 | Sharp Kabushiki Kaisha | Optical transmission and receiving module |
KR100382710B1 (en) * | 1999-10-19 | 2003-05-09 | 샤프 가부시키가이샤 | Optical transmission and reception system, and optical transmission and reception module and optical cable for the system |
DE102005019562A1 (en) * | 2004-09-06 | 2006-04-13 | Mitsubishi Denki K.K. | Optical transmitting and receiving module |
US7056037B2 (en) * | 2003-11-27 | 2006-06-06 | Konica Minolta Holdings, Inc. | Optical bidirectional module |
-
1994
- 1994-06-30 JP JP14948494A patent/JPH0815582A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000017691A1 (en) * | 1998-09-17 | 2000-03-30 | Matsushita Electric Industrial Co., Ltd. | Coupling lens and semiconductor laser module |
US6504975B1 (en) | 1998-09-17 | 2003-01-07 | Matsushita Electric Industrial Co., Ltd. | Coupling lens and semiconductor laser module |
US6236477B1 (en) * | 1999-01-12 | 2001-05-22 | Sharp Kabushiki Kaisha | Optical transmission and receiving module |
KR100382710B1 (en) * | 1999-10-19 | 2003-05-09 | 샤프 가부시키가이샤 | Optical transmission and reception system, and optical transmission and reception module and optical cable for the system |
US7056037B2 (en) * | 2003-11-27 | 2006-06-06 | Konica Minolta Holdings, Inc. | Optical bidirectional module |
DE102005019562A1 (en) * | 2004-09-06 | 2006-04-13 | Mitsubishi Denki K.K. | Optical transmitting and receiving module |
DE102005019562B4 (en) * | 2004-09-06 | 2006-10-19 | Mitsubishi Denki K.K. | Optical transmitting and receiving module |
US7128477B2 (en) | 2004-09-06 | 2006-10-31 | Renesas Technology Corp. | Optical transmitter and receiver module |
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