JPH01128013A - Fiber collimator for optical module - Google Patents
Fiber collimator for optical moduleInfo
- Publication number
- JPH01128013A JPH01128013A JP28546987A JP28546987A JPH01128013A JP H01128013 A JPH01128013 A JP H01128013A JP 28546987 A JP28546987 A JP 28546987A JP 28546987 A JP28546987 A JP 28546987A JP H01128013 A JPH01128013 A JP H01128013A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- fiber
- stage
- optical
- fiber collimator
- 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
- 239000000835 fiber Substances 0.000 title claims abstract description 54
- 230000003287 optical effect Effects 0.000 title claims abstract description 36
- 239000013307 optical fiber Substances 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 14
- 238000010168 coupling process Methods 0.000 abstract description 14
- 238000005859 coupling reaction Methods 0.000 abstract description 14
- 125000006850 spacer group Chemical group 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 239000010453 quartz Substances 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
Landscapes
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光モジュール用ファイバコリメータに関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fiber collimator for an optical module.
従来、光モジュール用ファイバコリメータに関しては、
例えば「無調整組立形合分波器内蔵波長多重送受信モジ
ュール」 （青木他、ＣＳ −８５−７４゜１９８５年
８月２３日、電子通信学会技術研究報告）なる文献に述
べられており、第４図に示す構造のコリメータが記載さ
れているが最適な光結合を得るには、各部品に高精度の
公差配分が必要であると記載されているのみで、ファイ
バコリメータの光結合組立精度の緩和の問題に関しては
、ふれていない。Conventionally, regarding fiber collimators for optical modules,
For example, it is described in the document "Wavelength division multiplexing transmitter/receiver module with built-in non-adjustable assembly type multiplexer/demultiplexer" (Aoki et al., CS-85-74゜ August 23, 1985, IEICE technical research report), Although a collimator with the structure shown in the figure is described, it is only stated that in order to obtain optimal optical coupling, high-precision tolerance allocation is required for each component, which eases the optical coupling assembly precision of the fiber collimator. The issue has not been touched upon.
上記従来の技術は、前述のごとくファイバコリメータの
光結合組立精度の緩和の点について配慮されておらず、
第４図に示すように、ファイバ２とレンズ４との光軸合
せを高精度に行い、精密な組立作業を要していた。その
ため、ファイバとレンズの軸ズレがわずかでも生じると
光結合損失が大きくなり１歩留り低下をきたし、特に光
ビームが細くなればなるほど、高精度の軸合せが必要と
なり、製品の信頼性と歩留りの点で問題があった。As mentioned above, the above conventional technology does not take into consideration the relaxation of the optical coupling assembly accuracy of the fiber collimator.
As shown in FIG. 4, the optical axes of the fiber 2 and the lens 4 must be aligned with high precision, and precise assembly work is required. Therefore, even a slight misalignment between the fiber and lens axes increases optical coupling loss, resulting in a one-point drop in yield.In particular, as the optical beam becomes narrower, highly accurate alignment is required, which reduces product reliability and yield. There was a problem with that.
本発明の目的は、これら従来の問題点を解決し、ファイ
バコリメータを構成する光学部品間の組立精度を緩和し
改良された光モジュール用ファイバコリメータを提供す
ることにある。SUMMARY OF THE INVENTION An object of the present invention is to solve these conventional problems and provide an improved fiber collimator for an optical module by reducing assembly precision between optical components constituting the fiber collimator.
上記目的は、レンズホルダ内のレンズの配置を。 The above purpose is to arrange the lens inside the lens holder.
ファイバ側から焦点距離の小さい順に複数個並べること
、及びファイバとファイバ側第１段のレンズのみを高精
度組立することにより達成される。This is achieved by arranging a plurality of lenses in ascending order of focal length from the fiber side, and by assembling only the fiber and the first stage lens on the fiber side with high precision.
以下に本発明の特徴点を具体的に挙げ、更に詳述する。Below, the features of the present invention will be specifically listed and explained in further detail.
（１）光ファイバ、レンズ及びレンズホルダを有し、前
記レンズホルダ内にレンズ及び前記レンズの開口面に対
向して前記光ファイバの一端面を埋め込んで成るファイ
バコリメータにおいて、前記レンズが複数個のレンズ群
から成り、前記ファイバの端面に対向する第１段のレン
ズの焦点を前記ファイバ端面に結ばせると共にこのレン
ズを前記レンズ群の中で焦点距離の最短のもので構成し
、以後焦点距離の短いものの順に順次前記レンズ群を前
記レンズホルダ内に配設することにより最終段のレンズ
が平行光線の出入を可能とする構成に成したことを特徴
とする。(1) A fiber collimator comprising an optical fiber, a lens, and a lens holder, in which one end surface of the optical fiber is embedded in the lens holder opposite to the lens and the aperture surface of the lens, wherein the lens includes a plurality of lenses. It consists of a lens group, and the focus of the first stage lens facing the end face of the fiber is connected to the end face of the fiber, and this lens is composed of the one with the shortest focal length among the lens groups, and from now on, The present invention is characterized in that by arranging the lens groups in the lens holder in order of shortest length, the final stage lens is configured to allow parallel light rays to enter and exit.
（２）上記レンズ群の各レンズを球レンズもしくは円柱
レンズとしたことを特徴とする。(2) Each lens in the lens group is a spherical lens or a cylindrical lens.
（３）上記レンズ群を３個のレンズで構成し、第２、第
３段のレンズの焦点が互いに一致する位置関係で上記レ
ンズホルダ内に配設したことを特徴とする。(3) The lens group is composed of three lenses, and the second and third stage lenses are arranged in the lens holder in a positional relationship such that the focal points of the lenses coincide with each other.
上記のレンズ群を構成する複数個のレンズは、上述のよ
うに球レンズもしく ｔｉ円柱レンズが好ましい。その
理由は、これらのレンズは焦点距離を短いものとするこ
とができ、コリメータを小型化する上で好ましいからで
ある。コリメータの大きさに拘らなければ、いずれのレ
ンズでも構わない。The plurality of lenses constituting the above lens group are preferably spherical lenses or cylindrical lenses as described above. The reason is that these lenses can have a short focal length, which is preferable for downsizing the collimator. Any lens may be used as long as the size of the collimator does not matter.
本発明によるファイバコリメータは、ファイバ端面側か
ら焦点距離の短い順にレンズ群が配置され、かつファイ
バに直面している最も焦点距離の短い第１段レンズの光
結合は高精度に組立てられているため、最終段レンズか
ら出入射する平行光線は、かなり広がったビームとなる
。この平行光線が広がれば広がるほど、ファイバコリメ
ータを対向させて光結合を得る場合、組立精度を緩和す
ることができる。In the fiber collimator according to the present invention, the lens groups are arranged in order of shortest focal length from the fiber end face side, and the optical coupling of the first stage lens with the shortest focal length facing the fiber is assembled with high precision. , the parallel light rays entering and leaving the final stage lens become a considerably spread beam. The wider the parallel light rays are, the more the assembly precision can be relaxed when optical coupling is obtained by opposing the fiber collimators.
以下本発明の実施例を第１図により説明する。 Embodiments of the present invention will be described below with reference to FIG.
第１図は、本発明による光モジュール用ファイバコリメ
ータの断面図で、金属より成るレンズホルダ１には、石
英等よりなるファイバ２及びこれを収容するアルミナ等
より成るフェルール３と、ＢＫ−７等より成る球レンズ
群即ち第１段レンズ４、第２段レンズ５、第３段レンズ
６をファイバ２側から焦点距離の短いレンズの順に配置
する。FIG. 1 is a sectional view of a fiber collimator for an optical module according to the present invention, in which a lens holder 1 made of metal includes a fiber 2 made of quartz or the like, a ferrule 3 made of alumina or the like to accommodate the fiber, and a ferrule 3 made of BK-7 or the like. A group of spherical lenses consisting of a first stage lens 4, a second stage lens 5, and a third stage lens 6 are arranged in order from the fiber 2 side to the lens with the shortest focal length.
一方、ファイバ２と第１段レンズ４間には焦点位置調整
のため、ＢＫ−７等より成るスペーサ７が配置される。On the other hand, a spacer 7 made of BK-7 or the like is arranged between the fiber 2 and the first stage lens 4 for focal position adjustment.
さらにファイバ２と第１段レンズ４の光結合効率が最大
となるよう、レンズホルダ１、フェルール３、第１段レ
ンズ４、スペーサ７の部品精度を厳しくし、高精度組立
される。Further, in order to maximize the optical coupling efficiency between the fiber 2 and the first stage lens 4, the lens holder 1, ferrule 3, first stage lens 4, and spacer 7 are assembled with strict precision.
第２図は本発明によるファイバコリメータの他の実施例
を示すもので、レンズに円柱形レンズ８．９、ｌＯを用
いて得いる外は、第１図と構成は同じである。FIG. 2 shows another embodiment of the fiber collimator according to the present invention, and the structure is the same as in FIG. 1 except that a cylindrical lens 8.9, 1O is used as the lens.
第３図は、ファイバコリメータの入射光線角度ズレΔθ
とレンズ光軸ズレΔＸとの関係を示す図で、第３段レン
ズ６の光軸Ｚに対し、入射光線Ｐの角度ズレをΔθ、光
軸Ｚとの軸ズレをΔＸとすると、ファイバとの光結合損
失を一定とした時、本発明実施例のΔθとΔＸは、第３
図のＡの特性となる。一方、第４図に示す従来のファイ
バコリメータでは、レンズ４が１個のため、第３図にお
いて、光結合損失を一定とした時、Ｂの特性となる。こ
のように、光結合損失を一定とした時、本発明実施例の
曲線Ａは、従来のＢに比較して、許容されるΔθ、ΔＸ
の範囲が約３０％広がっている。Figure 3 shows the incident ray angle deviation Δθ of the fiber collimator.
This is a diagram showing the relationship between the optical axis Z of the third stage lens 6 and the optical axis Z of the third stage lens 6. If the angle deviation of the incident light beam P is Δθ, and the axis deviation with the optical axis Z is ΔX, then the relationship between the fiber and the optical axis ΔX is When the optical coupling loss is constant, Δθ and ΔX of the embodiment of the present invention are the third
This is the characteristic of A in the figure. On the other hand, the conventional fiber collimator shown in FIG. 4 has one lens 4, so when the optical coupling loss is constant in FIG. 3, the characteristic is B. In this way, when the optical coupling loss is constant, the curve A of the embodiment of the present invention has the allowable Δθ, ΔX compared to the conventional curve B.
The range has expanded by about 30%.
かくして本発明によるファイバコリメータは、従来のも
のに比較し、角度ズレ、光軸ズレに対し、極めて緩和さ
れることになる。Thus, the fiber collimator according to the present invention is much more resistant to angular deviations and optical axis deviations than conventional ones.
本発明によれば
１）ファイバコリメータの入出射平行光線の角度ズレ、
光軸ズレの許容差を大きくすることができ、ファイバコ
リメータの歩留りが著しく向上する。According to the present invention, 1) angular deviation of input and output parallel rays of the fiber collimator;
The tolerance for optical axis misalignment can be increased, and the yield of fiber collimators is significantly improved.
２）ファイバコリメータを対向させて光結合を得る場合
、組立精度を大幅に緩和でき、光モジュールの組立歩留
りが飛躍的に向上する。2) When optical coupling is obtained by arranging fiber collimators facing each other, assembly accuracy can be significantly reduced, and the assembly yield of optical modules can be dramatically improved.
等性能向上、原価低減効果が著しい。The effect of improved performance and cost reduction is remarkable.
波長多重モジュール用ファイバコリメータにおいては、
ファイバ径が細くなるほどモジュール内部の結合光学系
の組立精度を上げる必要が生じ、特にファイバがマルチ
モードからシングルモードに移れば益々本発明の重要性
が認識されよう。In fiber collimators for wavelength multiplexing modules,
As the diameter of the fiber becomes smaller, it becomes necessary to increase the assembly accuracy of the coupling optical system inside the module, and the importance of the present invention will become more and more recognized especially as the fiber changes from multimode to single mode.
第１図及び第２図はそれぞれ本発明の異なる実施例によ
る光モジュール用ファイバコリメータの断面図、第３図
は本発明コリメータの光結合損失を一定とした場合に許
容される角度ズレ、光軸ズレ特性曲線を従来のものと対
比して示した曲線図、第４図は従来のファイバコリメー
タの断面図をそれぞれ示したものである。
図において。
１・・・レンズホルダ ２・・・ファイバ３・・・
フェルール ４．８・・・第１段レンズ５．９・
・・第２段レンズ ６．１０・・・第３段レンズ７・・
・スペーサ
代理人弁理士 中 村 純之助1 and 2 are cross-sectional views of fiber collimators for optical modules according to different embodiments of the present invention, and FIG. 3 shows the allowable angular deviation and optical axis when the optical coupling loss of the collimator of the present invention is constant. FIG. 4 is a curve diagram showing a comparison of the deviation characteristic curve with a conventional one, and FIG. 4 is a cross-sectional view of a conventional fiber collimator. In fig. 1... Lens holder 2... Fiber 3...
Ferrule 4.8...1st stage lens 5.9...
...Second stage lens 6.10...Third stage lens 7...
・Spacer attorney Junnosuke Nakamura
Claims (1)
レンズホルダ内にレンズ及び前記レンズの開口面に対向
して前記光ファイバの一端面を埋め込んで成るファイバ
コリメータにおいて、前記レンズが複数個のレンズ群か
ら成り、前記ファイバの端面に対向する第１段のレンズ
の焦点を前記ファイバ端面に結ばせると共にこのレンズ
を前記レンズ群の中で焦点距離の最短のもので構成し、
以後焦点距離の短いものの順に順次前記レンズ群を前記
レンズホルダ内に配設することにより最終段のレンズが
平行光線の出入を可能とする構成に成したことを特徴と
する光モジュール用ファイバコリメータ。 ２、上記レンズ群の各レンズを球レンズもしくは円柱レ
ンズとしたことを特徴とする特許請求の範囲第１項記載
の光モジュール用ファイバコリメータ。 ３、上記レンズ群を３個のレンズで構成し、第２、第３
段のレンズの焦点が互いに一致する位置関係で上記レン
ズホルダ内に配設したことを特徴とする特許請求の範囲
第１項もしくは第２項記載の光モジュール用ファイバコ
リメータ。[Claims] 1. A fiber collimator comprising an optical fiber, a lens, and a lens holder, and in which one end surface of the optical fiber is embedded in the lens holder facing the lens and the aperture surface of the lens, The lens is made up of a plurality of lens groups, and a first stage lens facing the end face of the fiber is focused on the end face of the fiber, and this lens is composed of a lens with the shortest focal length among the lens groups. ,
A fiber collimator for an optical module, characterized in that the lens groups are arranged in the lens holder in order of decreasing focal length, so that the final stage lens allows parallel rays to enter and exit. 2. The fiber collimator for an optical module according to claim 1, wherein each lens in the lens group is a spherical lens or a cylindrical lens. 3. The above lens group is composed of three lenses, and the second and third lenses
3. The fiber collimator for an optical module according to claim 1, wherein the fiber collimator for an optical module is arranged in the lens holder in a positional relationship such that the focal points of the lenses of the stages coincide with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28546987A JPH01128013A (en) | 1987-11-13 | 1987-11-13 | Fiber collimator for optical module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28546987A JPH01128013A (en) | 1987-11-13 | 1987-11-13 | Fiber collimator for optical module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01128013A true JPH01128013A (en) | 1989-05-19 |
Family
ID=17691922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28546987A Pending JPH01128013A (en) | 1987-11-13 | 1987-11-13 | Fiber collimator for optical module |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01128013A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04129111U (en) * | 1991-05-15 | 1992-11-25 | 安藤電気株式会社 | Light source and optical fiber coupler |
| JP2007188059A (en) * | 2005-12-12 | 2007-07-26 | Nichia Chem Ind Ltd | Optical component, optical conversion member and light emitting apparatus |
| WO2013111398A1 (en) | 2012-01-27 | 2013-08-01 | 三菱鉛筆株式会社 | Optical coupling member and optical connector |
| JP2014026153A (en) * | 2012-07-27 | 2014-02-06 | Mitsubishi Pencil Co Ltd | Optical coupling member and optical connector using the same |
-
1987
- 1987-11-13 JP JP28546987A patent/JPH01128013A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04129111U (en) * | 1991-05-15 | 1992-11-25 | 安藤電気株式会社 | Light source and optical fiber coupler |
| JP2007188059A (en) * | 2005-12-12 | 2007-07-26 | Nichia Chem Ind Ltd | Optical component, optical conversion member and light emitting apparatus |
| WO2013111398A1 (en) | 2012-01-27 | 2013-08-01 | 三菱鉛筆株式会社 | Optical coupling member and optical connector |
| JP2013156337A (en) * | 2012-01-27 | 2013-08-15 | Mitsubishi Pencil Co Ltd | Optical coupling member and optical connector |
| JP2014026153A (en) * | 2012-07-27 | 2014-02-06 | Mitsubishi Pencil Co Ltd | Optical coupling member and optical connector using the same |
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