JPS6395407A - Optical receiver - Google Patents
Optical receiverInfo
- Publication number
- JPS6395407A JPS6395407A JP24126686A JP24126686A JPS6395407A JP S6395407 A JPS6395407 A JP S6395407A JP 24126686 A JP24126686 A JP 24126686A JP 24126686 A JP24126686 A JP 24126686A JP S6395407 A JPS6395407 A JP S6395407A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical
- optical fiber
- lens
- angles
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 34
- 239000013307 optical fiber Substances 0.000 claims abstract description 30
- 230000005855 radiation Effects 0.000 claims 2
- 239000000835 fiber Substances 0.000 abstract description 10
- 230000008878 coupling Effects 0.000 abstract description 7
- 238000010168 coupling process Methods 0.000 abstract description 7
- 238000005859 coupling reaction Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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、光通信等に使用する光受信装置に関し、特に
広い受光角度に対して角度依存性が少なく、効率の高い
受信を可能にする光受信装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical receiving device used for optical communication, etc., which enables highly efficient reception with less angle dependence particularly over a wide light receiving angle. This invention relates to an optical receiving device.
［従来の技術］
従来、空間光通信に使用する受信装置は第６図に示すよ
うに、レンズ１により受光素子２に入射光を集光して光
信号を受信するのが一般的であった。このような方式で
は第６図に示すように斜め方向からの光信号３は受光素
子２にとらえることができないために、受信袋こが据ｉ
ｉ！ｉｙ！！！の場合にのみ使用が可能であり、広い受
光角度が必要な可搬型の受光素子には別の光学系が必要
となる。[Prior Art] Conventionally, as shown in FIG. 6, a receiving device used for spatial optical communication has generally received an optical signal by focusing incident light onto a light receiving element 2 using a lens 1. . In this type of system, as shown in Fig. 6, the optical signal 3 from the diagonal direction cannot be captured by the light receiving element 2, so the receiving bag is stationary.
i! iy! ! ! A separate optical system is required for portable light-receiving elements that require a wide light-receiving angle.
受光角度を広くするための光学系としては例えば魚限レ
ンズのようなものがあるが、これは高価であり、また光
学系が大型となるため可搬型の装置には適さない、より
簡単な光学系としては第７図に示すような球レンズ４を
使用した方式が考えられる。この球レンズ４の場合は点
対称であるため光の入射角度に対して、同等の光学特性
が得られ、また比較的広い入射角度範囲に対して集光す
る領域を狭くすることができる。また光学系が小型で安
価であるために可搬型の受信装置に適している利点があ
る。Optical systems for widening the light receiving angle include, for example, fish-limited lenses, but these are expensive and large, making them unsuitable for portable devices. As a system, a system using a ball lens 4 as shown in FIG. 7 can be considered. In the case of this spherical lens 4, since it is point symmetrical, equivalent optical characteristics can be obtained with respect to the incident angle of light, and the area where light is condensed can be narrowed over a relatively wide range of incident angles. Furthermore, since the optical system is small and inexpensive, it has the advantage of being suitable for a portable receiving device.
［発明が解決しようとする問題点］
しかしながら、広い角度範囲の入射光を受信するには受
光素子５は受光角の範囲に応じた大面積のものが必要で
あるが、大面積の受光素子を用いると接合容量の増加に
より、高速の信号に対して応答速度が不足する問題点が
生じる。[Problems to be Solved by the Invention] However, in order to receive incident light in a wide angle range, the light receiving element 5 needs to have a large area corresponding to the range of light receiving angles. When used, the problem arises that the response speed is insufficient for high-speed signals due to an increase in junction capacitance.
また、球レンズ４は入射角度に対して焦点が球面上に分
布しており、それに対して受光素子５は平面上に配置さ
れているから、焦点位置にある素子と焦点位置から外れ
た素子との間で受光効率との差が大きいという問題点が
ある。In addition, the focal points of the spherical lens 4 are distributed on a spherical surface with respect to the incident angle, whereas the light receiving element 5 is arranged on a flat surface, so there are two types of elements: one at the focal position and one outside the focal position. There is a problem that there is a large difference in light receiving efficiency between the two.
［問題点を解決するための手段］
本発明の目的は、上記従来技術の問題点に鑑み、広い受
光角度に対して角度依存性が少なく、効率の高い受信を
可能にする光受信装置を提供することにある。[Means for Solving the Problems] In view of the above-mentioned problems of the prior art, an object of the present invention is to provide an optical receiving device that enables highly efficient reception with less angular dependence over a wide light receiving angle. It's about doing.
以りのような目的は、広角度の光を入射し、各方向から
の光を所定面上に集光させるレンズと、複数の光ファイ
バを集合させたバンドル構造体であり、その一方の端面
形状を前記面形状となるように加工して光入射部とし、
該光入射部を前記レンズの焦点分布位置に設けた光ファ
イババンドルと、前記光ファイババンドルの他方の端面
に設けられその出射光を受光する１個または複数個の受
光素子とから構成されていることを特徴とする光受信装
置により達成される。The purpose of the above is a lens that allows wide-angle light to enter and focuses light from each direction onto a predetermined surface, and a bundle structure that collects multiple optical fibers, one end surface of which The shape is processed to have the above-mentioned surface shape to form a light incidence part,
It is composed of an optical fiber bundle in which the light incidence part is provided at the focal point distribution position of the lens, and one or more light receiving elements provided on the other end surface of the optical fiber bundle and receiving the emitted light. This is achieved by an optical receiving device characterized by the following.
［作用］
上記のような光受信装置によれば、前記レンズに各方向
から入射する光の焦点を連ねてできる焦点分布面に対応
して光ファイババンドルの各々の光ファイバの入射面を
設けることにより、広範囲の受光角度に対して結合効率
が高く、また角度依存性のない光検出が可能となる。[Function] According to the optical receiver as described above, the entrance surface of each optical fiber of the optical fiber bundle is provided corresponding to the focal point distribution surface formed by connecting the focal points of light incident on the lens from each direction. As a result, coupling efficiency is high over a wide range of light receiving angles, and light detection without angle dependence is possible.
例えば、前記レンズに球レンズを採用すれば。For example, if a spherical lens is used as the lens.
前記光ファイババンドルの光入射部は凹球面状に加工さ
れ、また各光ファイバは凹球面の中心に対して、放射状
に集合される。この凹球面は前記球レンズの入射角度に
対する焦点分布面である球面と同じ形状であり、また焦
点分布位置にほぼ一致する位置になるように固定される
。このような構成にすることにより、球レンズに入射し
たあらゆる角度からの光は光ファイババンドルの光入射
部上に集光され、かつその角度はファイバの光軸と一致
する。従って、広範囲の受光角度に対して結合効率が高
く、また角度依存性のない光検出が可能となる。The light incident part of the optical fiber bundle is processed into a concave spherical shape, and each optical fiber is gathered radially about the center of the concave spherical surface. This concave spherical surface has the same shape as the spherical surface that is the focal point distribution surface for the incident angle of the spherical lens, and is fixed at a position that substantially coincides with the focal point distribution position. With this configuration, light incident on the ball lens from all angles is focused onto the light incident portion of the optical fiber bundle, and the angle coincides with the optical axis of the fiber. Therefore, the coupling efficiency is high over a wide range of light receiving angles, and light detection without angle dependence is possible.
［実施例］
以下、本発明の光受信装置について具体的な実施例に基
づき詳細に説明する。[Example] Hereinafter, the optical receiving device of the present invention will be described in detail based on a specific example.
第１図は本発明の一実施例を示す概略構成図である。FIG. 1 is a schematic diagram showing an embodiment of the present invention.
同図において２０は珠レンズ、１８は光ファイバ、２１
は光ファイバ１８を集合させて製造した光ファイババン
ドル、２２はバンドル２１の光入射部（入射端）、２３
はバンドル２１の光出射部（出射端）、２４はバンドル
２１の出射端２３に近接して設けられた受光素子である
。In the figure, 20 is a bead lens, 18 is an optical fiber, and 21
22 is an optical fiber bundle manufactured by assembling the optical fibers 18, 22 is the light incidence part (incidence end) of the bundle 21, and 23
2 is a light emitting part (emitting end) of the bundle 21, and 24 is a light receiving element provided close to the emitting end 23 of the bundle 21.
第２図は光ファイババンドル２１の光入射部２２と球レ
ンズ２０の結合部の詳細図である。FIG. 2 is a detailed view of the coupling portion between the light entrance portion 22 of the optical fiber bundle 21 and the ball lens 20. As shown in FIG.
第２図のように、光ファイババンドル２１の入射端ｚ２
は凹球面状に加工され、また各光ファイバは凹球面の中
心に対して、放射状に集合されている。この凹球面は球
レンズ２０の入射角度に対する焦点分布面である球面と
同じ形状であり、また焦点分布面にほぼ一致する位置に
なるように固定される。この構成では、球レンズ２ｏに
入射したあらゆる角度からの光は光ファイババンドル２
ｌの入射面上に集光され、かつその角度はそれぞれのフ
ァイバ１８の光軸と一致する。従って、広範囲の受光角
度に対して結合効率が高く、また角度依存性のない光検
出が可能となる。As shown in FIG. 2, the input end z2 of the optical fiber bundle 21
is processed into a concave spherical shape, and each optical fiber is gathered radially around the center of the concave spherical surface. This concave spherical surface has the same shape as the spherical surface which is the focal point distribution surface for the incident angle of the spherical lens 20, and is fixed at a position that substantially coincides with the focal point distribution surface. In this configuration, light from any angle incident on the ball lens 2o is transmitted to the optical fiber bundle 2
The light is focused onto the incident surface of the fiber 18, and its angle coincides with the optical axis of each fiber 18. Therefore, the coupling efficiency is high over a wide range of light receiving angles, and light detection without angle dependence is possible.
また本実施例において、ファイババンドル内部での光損
失と、ファイババンドル出射部と受光部での光損失は端
面での７レネル反射損失を除き実際上無視することがで
きる。Further, in this embodiment, the optical loss inside the fiber bundle and the optical loss at the fiber bundle output section and light receiving section can be practically ignored except for the 7-Renel reflection loss at the end face.
第３図はファイババンドル出射端２３に複数の受光素子
３１を使用した実施例である。第１図に示す実施例では
受光素子２４の面積が大きくて受光素子の応答速度が不
足する場合には第３図のように小受光面積で応答速度の
速い複数個の受光素子３１に分配して受光することで高
速の信号に対応することができる。この場合、１個の受
光素子には１本あるいは複数本のファイバが結合する。FIG. 3 shows an embodiment in which a plurality of light receiving elements 31 are used at the output end 23 of the fiber bundle. In the embodiment shown in FIG. 1, if the area of the light-receiving element 24 is large and the response speed of the light-receiving element is insufficient, the light-receiving element 24 is divided into a plurality of light-receiving elements 31 with small light-receiving areas and fast response speeds as shown in FIG. By receiving light at the same time, it is possible to handle high-speed signals. In this case, one or more fibers are coupled to one light receiving element.
また、球レンズ２０に入射する光の角度に応じて受光量
の多い受光素子を検出して、その中から１個または複数
個の受光素子を選択して信号を取り出すことにより、速
度の向上とＳ／Ｎ比の向上を同時に達成することもでき
る。In addition, by detecting a light receiving element that receives a large amount of light according to the angle of light incident on the ball lens 20, and selecting one or more light receiving elements from among them and extracting a signal, the speed can be improved. It is also possible to simultaneously improve the S/N ratio.
第４図はファイババンドル出射端２３に第５図に示すよ
うな同一チップ上で独立した複数個の受光素子に分割さ
れた構造の受光素子２５を結合させた例である。FIG. 4 shows an example in which a light receiving element 25 having a structure in which the same chip is divided into a plurality of independent light receiving elements as shown in FIG. 5 is coupled to the fiber bundle output end 23.
この実施例でも第３図の例と同様に１素子当りの面積を
小さくすることにより応答速度を速くすることができ、
また同様に１個ないし複数個の素子を選択して使用する
方法を併用することができる。また、第４図の方法は第
３図の方法に比べて受光素子の占める面積が小さいため
装置を小型化することができる。In this embodiment as well, the response speed can be increased by reducing the area per element as in the example shown in FIG.
Similarly, a method of selecting and using one or more elements can be used in combination. Furthermore, in the method shown in FIG. 4, the area occupied by the light receiving element is smaller than in the method shown in FIG. 3, so that the device can be made smaller.
本発明は前記実施例に限らず種々の変形または応用が可
能である。The present invention is not limited to the embodiments described above, and various modifications and applications are possible.
例えば、前記実施例では本発明に用いるレンズを球レン
ズとして説明したが、これは現在球レンズが比較的安価
に入手できるため選んだにすぎず、必ずしも球レンズで
なければならない必然性はない、よって、回転放物面、
回転楕円面等の非球面を全部または一部に有するレンズ
を用いてもよい。For example, in the above embodiments, the lens used in the present invention was explained as a spherical lens, but this was only chosen because spherical lenses are currently available at relatively low prices, and it does not necessarily have to be a spherical lens. , paraboloid of revolution,
A lens having an aspherical surface such as a spheroidal surface in whole or in part may be used.
また、前記実施例の説明は本発明を光空間通信用の受信
装置として使用した例についてであったが、本発明は他
の目的のための受光装置としての応用も可能である０例
えば、球レンズへの光の入射角により集光された光を伝
搬するファイバが特定されることを利用すれば、光源の
位こ、方向、移動等を検出するためのセンサとして使用
することができる。また逆に光源の位置が一定である場
合は、物体に本装置を実装すればその物体の位置、方向
、運動等を検出する検出装置として用いることができる
。Further, although the above embodiments have been described as examples in which the present invention is used as a receiving device for optical space communication, the present invention can also be applied as a light receiving device for other purposes. By utilizing the fact that the fiber that propagates the focused light is specified by the angle of incidence of the light on the lens, it can be used as a sensor for detecting the position, direction, movement, etc. of the light source. Conversely, when the position of the light source is constant, by mounting this device on an object, it can be used as a detection device for detecting the position, direction, movement, etc. of that object.
［発明の効果］
以上、説明した様に本発明の光受信装置によれば、広い
受信角度範囲にわたり、受光素子との結合性の良好な光
空間通信用等に使用できる光受信装置を提供できる。[Effects of the Invention] As described above, according to the optical receiving device of the present invention, it is possible to provide an optical receiving device that can be used for optical space communication, etc., and has good coupling with a light receiving element over a wide receiving angle range. .
第１図は本発明の光受信装置の一実施例の概略構成図、
第２図は第１図の装置の光入射部の詳細図、第３図は受
光素子を複数個使用した実施例を示す図、第４図は同一
チップ上で分割された受光素子を使用した実施例を示す
図、第５図は第４図における受光素子の分割例を示す図
である。
第６図は従来の光空間通信に使用する光受信装置の概略
構成図、第７図は球レンズを使用した従来の光受信装置
を示す概略構成図である。
１８：光ファイバ
２０：球レンズ
２１：光ファイババンドル
２２：光入射部（入射端）
２３：光出射部（出射端）
２４：受光素子
２５：同一チップ上で複数個の受光素子に分割された構
造の受光素子
３１：小受光面積の受光素子
代理人 弁理士 山 下 穣 平
第１図
第２図
＝＝＝＼二。
第４図 第５図
第６図
第７図FIG. 1 is a schematic configuration diagram of an embodiment of the optical receiving device of the present invention;
Figure 2 is a detailed view of the light incidence part of the device shown in Figure 1, Figure 3 is a diagram showing an example using multiple light receiving elements, and Figure 4 is a diagram showing an example in which multiple light receiving elements are used on the same chip. FIG. 5 is a diagram showing an example of the division of the light-receiving element in FIG. 4. FIG. 6 is a schematic configuration diagram of a conventional optical receiving device used in optical space communication, and FIG. 7 is a schematic configuration diagram showing a conventional optical receiving device using a ball lens. 18: Optical fiber 20: Ball lens 21: Optical fiber bundle 22: Light input section (incidence end) 23: Light output section (output end) 24: Light receiving element 25: Divided into multiple light receiving elements on the same chip Structure of light-receiving element 31: Light-receiving element with small light-receiving area Agent Patent attorney Jo Taira Yamashita Figure 1 Figure 2 ===\2. Figure 4 Figure 5 Figure 6 Figure 7
Claims (4)
に集光させるレンズと、 複数の光ファイバを集合させたバンドル構造体であり、
その一方の端面形状を前記面形状となるように加工して
光入射部とし、該光入射部を前記レンズの焦点分布位置
に設けた光ファイババンドルと、 前記光ファイババンドルの他方の端面に設けられその出
射光を受光する１個または複数個の受光素子とから構成
されていることを特徴とする光受信装置。(1) A lens that allows wide-angle light to enter and focuses light from each direction onto a predetermined surface, and a bundle structure that collects multiple optical fibers.
An optical fiber bundle in which one end face shape is processed to have the above-mentioned surface shape to form a light incidence part, and the light incidence part is provided at a focal point distribution position of the lens; and an optical fiber bundle provided in the other end face of the optical fiber bundle. 1. An optical receiver comprising one or more light receiving elements that receive the emitted light.
求の範囲第１項記載の光受信装置。(2) The optical receiving device according to claim 1, wherein the lens is spherical.
光素子に分割されたものであることを特徴とする特許請
求の範囲第１項記載の光受信装置。(3) The optical receiving device according to claim 1, wherein the light receiving element is divided into a plurality of independent light receiving elements on the same chip.
各々の光ファイバの入射面に垂直に入射するように、各
々の光ファイバの入射面を平面にし、かつ各々の光ファ
イバの光軸と前記レンズを経た光の各光ファイバの位置
での放射方向とを一致させたことを特徴とする特許請求
の範囲第１項記載の光受信装置。(4) The entrance surface of each optical fiber is made flat so that the light from the lens is perpendicularly incident on the entrance surface of each optical fiber of the optical fiber bundle, and the optical axis of each optical fiber and the 2. The optical receiving device according to claim 1, wherein the radiation direction of the light passing through the lens is made to coincide with the direction of radiation at the position of each optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61241266A JPH07111490B2 (en) | 1986-10-13 | 1986-10-13 | Optical receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61241266A JPH07111490B2 (en) | 1986-10-13 | 1986-10-13 | Optical receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6395407A true JPS6395407A (en) | 1988-04-26 |
| JPH07111490B2 JPH07111490B2 (en) | 1995-11-29 |
Family
ID=17071695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61241266A Expired - Fee Related JPH07111490B2 (en) | 1986-10-13 | 1986-10-13 | Optical receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07111490B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023073947A1 (en) * | 2021-10-29 | 2023-05-04 | 日本電気株式会社 | Reception device, communication device, and communication system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4922898A (en) * | 1972-06-21 | 1974-02-28 | ||
| JPS50126438A (en) * | 1974-03-26 | 1975-10-04 |
-
1986
- 1986-10-13 JP JP61241266A patent/JPH07111490B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4922898A (en) * | 1972-06-21 | 1974-02-28 | ||
| JPS50126438A (en) * | 1974-03-26 | 1975-10-04 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023073947A1 (en) * | 2021-10-29 | 2023-05-04 | 日本電気株式会社 | Reception device, communication device, and communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07111490B2 (en) | 1995-11-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |