JP2613879B2 - Light receiving module - Google Patents
Light receiving moduleInfo
- Publication number
- JP2613879B2 JP2613879B2 JP62081020A JP8102087A JP2613879B2 JP 2613879 B2 JP2613879 B2 JP 2613879B2 JP 62081020 A JP62081020 A JP 62081020A JP 8102087 A JP8102087 A JP 8102087A JP 2613879 B2 JP2613879 B2 JP 2613879B2
- Authority
- JP
- Japan
- Prior art keywords
- light receiving
- optical fiber
- receiving element
- light
- receiving module
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光通信システムに用いる受光モジュールに係
わり、特に半導体受光素子と光ファイバとを光学的に直
接結合する構造を有する受光モジュールに関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light receiving module used in an optical communication system, and more particularly to a light receiving module having a structure in which a semiconductor light receiving element and an optical fiber are directly optically coupled.
従来、この種の受光モジュールとして、例えば第５図
に示したようなものがある。すなわち、光ファイバ１が
保持部材２によって保持され、ナット３によってホルダ
４に保持されている。ホルダ４には、ガラス窓５および
受光素子６を有するパッケージ７がろう材８によって固
定されている。これにより、光ファイバ１と受光素子６
とが同一光軸上で光学的に直接結合されている。Conventionally, as this type of light receiving module, for example, there is one as shown in FIG. That is, the optical fiber 1 is held by the holding member 2 and held by the holder 4 by the nut 3. A package 7 having a glass window 5 and a light receiving element 6 is fixed to the holder 4 by a brazing material 8. Thereby, the optical fiber 1 and the light receiving element 6
Are directly optically coupled on the same optical axis.
ところで、このような従来の受光モジュールでは、第
５図のごとく、ホルダ４の端面4aとパッケージ７の端面
7aとの間に所定の間隙をあけ、受光素子６の量子効率
η、すなわち光ファイバ１からの入射光を電流に変換す
る効率が最大になるように、光ファイバ１の端面1aと受
光素子６との間の距離ｌを調整し、ホルダ４とパッケー
ジ７とを固定する構成とされている。By the way, in such a conventional light receiving module, as shown in FIG. 5, the end face 4a of the holder 4 and the end face of the package 7 are formed.
A predetermined gap is provided between the end face 1a of the optical fiber 1 and the light receiving element 6 so that the quantum efficiency η of the light receiving element 6, that is, the efficiency of converting incident light from the optical fiber 1 into a current is maximized. Is adjusted so that the holder 4 and the package 7 are fixed.
ところが、例えば受光径が数百μｍと大きい受光素子
の場合、量子効率ηが最大であっても、必ずしも応答時
間Ｔ、すなわち入射光を電流に変換する時間が最小とは
ならず、応答時間のＴのばらつきが大きくなるという問
題があった。However, in the case of a light-receiving element having a large light-receiving diameter of several hundred μm, for example, even if the quantum efficiency η is maximum, the response time T, that is, the time for converting incident light into current is not necessarily the minimum, and the response time There was a problem that the variation of T became large.
本発明はこのような事情に鑑みてなされたもので、量
子効率ηと応答時間Ｔとが、共に最良となり、光通信シ
ステムに適用した場合にSN比が大きく、かつ、利用帯域
が広くできる受光モジュールを提供することを目的とす
る。The present invention has been made in view of such circumstances, and the quantum efficiency η and the response time T are both the best, so that when applied to an optical communication system, the SN ratio is large and the light receiving area can be widened. The purpose is to provide a module.
本発明の受光モジュールは、光ファイバからの出射光
を、大口径の受光面を有する半導体受光素子の受光面に
光学的に直接結合させる受光モジュールにおいて、出射
光を電流に変換する量子効率が最大となるときの光ファ
イバの端面と受光面との距離よりも大きい領域で、かつ
半導体受光素子の応答時間があらかじめ定められた時間
よりも小さくなる光ファイバの端面と受光面との領域
に、光ファイバと半導体受光素子とを配列固定し、上記
目的を達成せんとするものである。The light-receiving module of the present invention is a light-receiving module in which light emitted from an optical fiber is directly optically coupled to a light-receiving surface of a semiconductor light-receiving element having a large-diameter light-receiving surface. In a region larger than the distance between the end face of the optical fiber and the light receiving surface when the following condition is satisfied, and in the region between the end surface of the optical fiber and the light receiving surface where the response time of the semiconductor light receiving element is shorter than a predetermined time, The object is to achieve the above object by fixing the arrangement of the fibers and the semiconductor light receiving elements.
以下、本発明の一実施例を第１図〜第４図を参照して
説明する。Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
第１図はこの実施例の受光モジュールの概略構成、第
２図は光学的配置関係を示す。第１図に示すように、光
ファイバ９が保持部材10によって保持され、ナット11に
よってホルダ12内に保持されている。また、ホルダ12内
には、ガラス窓13および受光素子14を有するパッケージ
15がろう材16によって固定されている。そして、第２図
に示すように、光ファイバ９の端面9aから出射された出
力光ビーム17は、ガラス窓13を透過し、受光素子14に照
射されるようになっている。FIG. 1 shows a schematic configuration of a light receiving module of this embodiment, and FIG. 2 shows an optical arrangement. As shown in FIG. 1, an optical fiber 9 is held by a holding member 10 and held in a holder 12 by a nut 11. Further, a package having a glass window 13 and a light receiving element 14 in the holder 12 is provided.
15 is fixed by brazing material 16. Then, as shown in FIG. 2, the output light beam 17 emitted from the end face 9a of the optical fiber 9 is transmitted through the glass window 13 and irradiated on the light receiving element 14.
このものにおいて、ホルダ12の端面12aとパッケージ1
5の端面15aとが接合され、その接合面と光ファイバ９と
の間の距離は、応答速度が最小になる距離と受光素子14
からパッケージ15の端面15aまでの光学距離との差に設
定し、これにより、量子効率ηが最大かつ応答時間Ｔが
最小になる位置関係となるように、光ファイバ９の端面
9aから受光素子14までの距離ｌを固定してある。In this case, the end face 12a of the holder 12 and the package 1
5 is joined to the end face 15a, and the distance between the joining surface and the optical fiber 9 is determined by the distance at which the response speed is minimized and the light receiving element 14.
And the optical distance from the optical fiber 9 to the end face 15a of the package 15, so that the end face of the optical fiber 9 is positioned such that the quantum efficiency η is maximized and the response time T is minimized.
The distance 1 from 9a to the light receiving element 14 is fixed.
すなわち、第３図は例えば受光径880μｍの受光素子1
4とコア径50μｍ、開口数0.2の光ファイバ９端面との距
離ｌに対する量子効率ηの特性、およびｌに対する応答
時間Ｔの特性を示し、また第４図はｌをパラメータとし
たときのＴ対VR（受光素子の逆バイアス電圧）の特性を
示している。That is, FIG. 3 shows a light receiving element 1 having a light receiving diameter of 880 μm, for example.
4 shows the characteristic of the quantum efficiency η with respect to the distance l between the end face of the optical fiber 9 having the core diameter of 50 μm and the numerical aperture of 0.2, and the characteristic of the response time T with respect to l. FIG. It shows the characteristics of V R (reverse bias voltage of the light receiving element).
第３図に示すように、受光素子14の受光径が880μ
ｍ、受光素子14からパッケージ15の端面までの光学距離
が500μｍ、光ファイバ９のコア径が50μｍ、開口数が
0.2の場合、量子効率ηが最大となる領域Δl1でかつ応
答時間Ｔが最小になる領域Δl2から、距離ｌは2mmとさ
れている。これに従い、光ファイバ９の端面9aからホル
ダ12とパッケージ15との接合面までの距離は1.5mmに設
定されている。As shown in FIG. 3, the light receiving element 14 has a light receiving diameter of 880 μm.
m, the optical distance from the light receiving element 14 to the end face of the package 15 is 500 μm, the core diameter of the optical fiber 9 is 50 μm, and the numerical aperture is
For 0.2, from the region .DELTA.l 2 quantum efficiency η is maximum and a region .DELTA.l 1 a and the response time T is minimized, the distance l is a 2 mm. Accordingly, the distance from the end face 9a of the optical fiber 9 to the joint surface between the holder 12 and the package 15 is set to 1.5 mm.
このような受光モジュールによると、受光素子14の量
子効率ηおよび応答時間Ｔが共に最良となる領域Δl3の
範囲で受光素子14と光ファイバ９とが固定してあるの
で、量子効率ηが高くなるだけでなく、応答時間Ｔも速
くなり、光通信システムに適用することによりSN比が大
きく、かつ利用帯域も拡大される。According to such a light receiving module, since the light receiving element 14 and the optical fiber 9 are fixed in a range Δl 3 where the quantum efficiency η and the response time T of the light receiving element 14 are both the best, the quantum efficiency η is high. Not only that, the response time T also becomes faster, and when applied to an optical communication system, the SN ratio is increased and the bandwidth used is expanded.
なお、本発明は前記実施例で示した数値の場合に限ら
ず、種々の受光素子の受光径等に応じた距離を設定して
実施することができる。The present invention is not limited to the case of the numerical values shown in the above embodiment, but can be implemented by setting a distance according to the light receiving diameter of various light receiving elements.
以上のように、本発明の受光モジュールによれば、量
子効率および応答時間が共に良好な領域内で光ファイバ
と受光素子とを配列したことにより、応答時間が速くな
り、光通信システムのSN比の拡大、広帯域等に大きく寄
与することができる。As described above, according to the light-receiving module of the present invention, by arranging the optical fiber and the light-receiving element in a region where both the quantum efficiency and the response time are good, the response time becomes faster, and the S / N ratio of the optical communication system becomes higher. Can be greatly contributed to expansion of the band, wide band, and the like.
第１図は本発明の一実施例を示す断面図、第２図は光学
構成を示す拡大図、第３図および第４図は本発明の特性
を示すためのグラフ、第５図は従来例を示す断面図であ
る。 ９……光ファイバ、14……受光素子。FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged view showing an optical configuration, FIGS. 3 and 4 are graphs showing characteristics of the present invention, and FIG. FIG. 9 ... optical fiber, 14 ... light receiving element.
Claims (1)
面を有する半導体受光素子の前記受光面に光学的に直接
結合させる受光モジュールにおいて、 前記出射光を電流に変換する量子効率が最大となるとき
の前記光ファイバの端面と前記受光面との距離よりも大
きい領域で、かつ 前記半導体受光素子の応答時間があらかじめ定められた
時間よりも小さくなる前記光ファイバの端面と前記受光
面との領域に、 前記光ファイバと前記半導体受光素子とを配列固定した
ことを特徴とする受光モジュール。1. A light receiving module for optically directly coupling outgoing light from an optical fiber to the light receiving surface of a semiconductor light receiving element having a large diameter light receiving surface, wherein a quantum efficiency for converting the outgoing light into a current is maximum. In a region larger than the distance between the end surface of the optical fiber and the light receiving surface when the end surface of the optical fiber and the light receiving surface and the response time of the semiconductor light receiving element is smaller than a predetermined time A light receiving module, wherein the optical fiber and the semiconductor light receiving element are arranged and fixed in a region of (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62081020A JP2613879B2 (en) | 1987-04-03 | 1987-04-03 | Light receiving module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62081020A JP2613879B2 (en) | 1987-04-03 | 1987-04-03 | Light receiving module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63247709A JPS63247709A (en) | 1988-10-14 |
| JP2613879B2 true JP2613879B2 (en) | 1997-05-28 |
Family
ID=13734801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62081020A Expired - Lifetime JP2613879B2 (en) | 1987-04-03 | 1987-04-03 | Light receiving module |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2613879B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6037506A (en) * | 1983-08-09 | 1985-02-26 | Omron Tateisi Electronics Co | Method for joining optical element with optical fiber |
| JPS61220382A (en) * | 1985-03-27 | 1986-09-30 | Hitachi Ltd | Optical transmission module and assembly method thereof |
-
1987
- 1987-04-03 JP JP62081020A patent/JP2613879B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63247709A (en) | 1988-10-14 |
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