JPS62237409A - Light emitting module - Google Patents

Light emitting module

Info

Publication number
JPS62237409A
JPS62237409A JP8151686A JP8151686A JPS62237409A JP S62237409 A JPS62237409 A JP S62237409A JP 8151686 A JP8151686 A JP 8151686A JP 8151686 A JP8151686 A JP 8151686A JP S62237409 A JPS62237409 A JP S62237409A
Authority
JP
Japan
Prior art keywords
light
optical fiber
led
reflecting member
light emitting
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
Application number
JP8151686A
Other languages
Japanese (ja)
Inventor
Toyokazu Iwakiri
岩切 豊和
Hiroo Kishimoto
岸本 紘男
Yoshio Sano
佐野 善雄
Tomohiro Shimada
友弘 島田
Akira Sugiyama
章 杉山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP8151686A priority Critical patent/JPS62237409A/en
Publication of JPS62237409A publication Critical patent/JPS62237409A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To monitor the quantity of light which is emitted from an LED, without decreasing the quantity of light which is emitted from the LEd and made incident on an optical fiber, by using a perforated reflecting member. CONSTITUTION:A hole 9 is made on a reflecting surface 8 of a reflecting member 7. A light beam which has been emitted from an LED 1 becomes parallel rays 11-14 by a spherical lens 4, and the parallel rays 13, 14 are reflected by the reflecting surface 8 of the reflecting member 7 and become parallel rays 43, 44, and made incident on a light receiving element 2. On the other hand, the parallel rays 11, 12 pass through the hole 9 which has been made on the reflecting surface 8 of the reflecting member 7, and thereafter, focused by a spherical lens 5, made incident on an optical fiber 3, and propagated in the optical fiber 3. The parallel rays 13, 14 are light beams which cannot be made incident and propagated on and through the optical fiber 3, even if the reflecting member 7 does not exist, therefore, even if the reflecting member 7 is inserted into an optical path, the quantity of light which is propagated through the optical fiber 3 does not decrease.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、光通信において用いられる、発光モジュール
に関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a light emitting module used in optical communications.

(発明の概要) 本発明は、発光モジュールにおいて、穴のあいた反射部
材を用いることにより、光ファイバーに入射す、る光1
を減らすこ・となく、発光素子の光mをモニターできる
ようにしたものである。
(Summary of the Invention) The present invention uses a reflective member with holes in a light emitting module to reduce the amount of light incident on an optical fiber.
This makes it possible to monitor the light m of the light emitting element without reducing the amount of light m.

(従来の技術) 従来の発光モジュールを第2図に示す。jはしED、2
は受光素子、3は光ファイバー、4及び5は球レンズ、
18はガラス板である。LEDlから出射した光は、球
レンズ4により平行光11゜12.13及び14となり
、ガラス板18へ達する。ガラス板18により、平行光
11.12゜13及び14の一部は反射され、平行光3
1゜32.33及び34となり、受光素子2へ入射する
。平行光11,12.13及び14の大部分は、ガラス
板18を透過し平行光21.22.23及び24となり
、球レンズ5によって光ファイバー3の端面に集光され
る。
(Prior Art) A conventional light emitting module is shown in FIG. j Hashi ED, 2
is a light receiving element, 3 is an optical fiber, 4 and 5 are ball lenses,
18 is a glass plate. The light emitted from the LED 1 becomes parallel beams 11°, 12, 13 and 14 by the ball lens 4, and reaches the glass plate 18. Part of the parallel beams 11, 12 degrees 13 and 14 are reflected by the glass plate 18, and the parallel beams 3
1°32.33 and 34, and enter the light receiving element 2. Most of the parallel beams 11, 12, 13 and 14 pass through the glass plate 18 and become parallel beams 21, 22, 23 and 24, which are focused by the ball lens 5 onto the end face of the optical fiber 3.

(発明が解決しようとする問題点) 上記のような発光モジュールでは、LEDの光量をモニ
ターする為に、本来ならば光ファイバーに入射すべき光
のうちのいくらかは確実に光ファイバーへ入射しないこ
とになる。つまり、モニターする為に光ファイバーへ入
射する光量が減ることになる。
(Problem to be solved by the invention) In the light emitting module as described above, in order to monitor the light intensity of the LED, some of the light that should normally enter the optical fiber definitely does not enter the optical fiber. . In other words, the amount of light entering the optical fiber for monitoring is reduced.

(問題点を解決するための手段) 本発明においては、穴のあいた反射部材を用いることに
より、LEDから出射し光ファイバーへ入射する光量を
減らすことなく、LEDから出射する光量をモニターで
きるようにした。
(Means for solving the problem) In the present invention, by using a reflective member with holes, it is possible to monitor the amount of light emitted from the LED without reducing the amount of light emitted from the LED and incident on the optical fiber. .

(作用) 第2図に示した従来の発光モジュールにおいて、平行光
23及び24は、球レンズ5によって光ファイバー3の
端面に集光するが、光ファイバー3への入射角が大きす
ぎる為、光ファイバー3を伝播できない。これは、LE
Dからの出射光の拡がり角θが、光ファイバーのN A
 (NullleriCal Aper−ture)に
対応する角度θ(N A = sinθ)よりも大きい
ことに起因する。
(Function) In the conventional light emitting module shown in FIG. 2, the parallel lights 23 and 24 are focused on the end face of the optical fiber 3 by the ball lens 5, but since the angle of incidence on the optical fiber 3 is too large, the parallel lights 23 and 24 are Cannot be propagated. This is L.E.
The spread angle θ of the light emitted from D is the NA of the optical fiber.
(NulleriCal Aper-ture) is larger than the angle θ (NA = sin θ).

本発明においては、この光フアイバ一端面に達しても、
光フアイバー中を伝播できない平行光を反射部材により
、モニター用の受光素子へ導き、光フアイバー中を伝播
できる平行光について(,11反射部材にありられた穴
を通過させることにより、従来不可だった先遣の損失を
生ずることなく、LEDから出射する光量をモニターす
ることが可能になった。
In the present invention, even if one end face of this optical fiber is reached,
Parallel light that cannot propagate through an optical fiber is guided to a light-receiving element for monitoring by a reflective member, and parallel light that can propagate through an optical fiber (11. It has become possible to monitor the amount of light emitted from the LED without causing any loss in advance.

(実施例) 本発明の一実施例を第1図に示す。1はLED。(Example) An embodiment of the present invention is shown in FIG. 1 is LED.

2は受光素子、3は光ファイバー、4及び5は球レンズ
、7は反射部材、8は反射部材7の反射面、9は反射部
材7の反射面8にあけられた穴である。
2 is a light receiving element, 3 is an optical fiber, 4 and 5 are ball lenses, 7 is a reflective member, 8 is a reflective surface of the reflective member 7, and 9 is a hole made in the reflective surface 8 of the reflective member 7.

LEDlから出射した光は、球レンズ4により平行光1
1,12.13及び14となる。平行光13及び14は
、反射部材7の反射面8によって反射されて平行光43
及び44となり、受光素子2へ入射する。一方、平行光
11及び12は、反射部材7の反射面8にあけられた穴
9を通過した後、球レンズ5により集束され、光ファイ
バー3へ入射し、光フアイバー3中を伝播する。
The light emitted from the LED 1 is converted into parallel light 1 by a ball lens 4.
1, 12, 13 and 14. The parallel beams 13 and 14 are reflected by the reflective surface 8 of the reflective member 7 and become parallel beams 43.
and 44, and enters the light receiving element 2. On the other hand, the parallel lights 11 and 12 pass through a hole 9 made in the reflective surface 8 of the reflective member 7, are focused by the ball lens 5, enter the optical fiber 3, and propagate through the optical fiber 3.

上にも述べたように、平行光13及び14は、もし反射
部材7が存在しないとしても、光ファイバー3に入射・
伝播できない光であるから、反射部材7が光路中に挿入
されたことによって、光ファイバー3を伝播する光1の
減少はない。
As mentioned above, the parallel beams 13 and 14 are incident on the optical fiber 3 even if the reflective member 7 is not present.
Since the light cannot propagate, the light 1 propagating through the optical fiber 3 does not decrease by inserting the reflecting member 7 into the optical path.

なお、反射面8に、反射率の高い金等を蒸着・メッキ等
すると、受光素子2へ入射する光を増やすことができる
Note that if the reflective surface 8 is vapor-deposited or plated with gold or the like having a high reflectance, the amount of light that enters the light receiving element 2 can be increased.

第3図に他の実施例を示す。6はGRINレンズ、他の
符号は第1図と同じである。
FIG. 3 shows another embodiment. 6 is a GRIN lens, and the other symbols are the same as in FIG.

本実施例においては、LEDから出射した光を平行光1
1.12.13及び14にする為にGRINレンズ6と
球レンズ4を用いている。
In this embodiment, the light emitted from the LED is converted into parallel light 1
1.12.13 and 14, a GRIN lens 6 and a ball lens 4 are used.

第4図に第3の実施例を示す。10は球レンズ、他の符
号は第1図と同じである。
FIG. 4 shows a third embodiment. 10 is a ball lens, and other symbols are the same as in FIG.

本実施例においては、反射部材7の反射面8によって反
射された平行光43及び44を球レンズ1oによって受
光素子2の受光面へ集光している。
In this embodiment, parallel beams 43 and 44 reflected by the reflecting surface 8 of the reflecting member 7 are focused onto the light receiving surface of the light receiving element 2 by the ball lens 1o.

これは、受光素子2の受光面が小さい時に有効である。This is effective when the light receiving surface of the light receiving element 2 is small.

第5図に第4の実施例を示す。50はバンドパスフィル
ター、他の符号は第1図と同じである。
FIG. 5 shows a fourth embodiment. 50 is a band pass filter, and other symbols are the same as in FIG.

光コネクターの接続損失を測定する際に、光源として1
.3m帯のLEDを用いると、1.38趨にある光ファ
イバーのOHMによる光吸収の影響を受け、光コネクタ
ーの損失を実際より大きく見積ってしまう。それを避け
る為に、LEDの波長の拡がりを縮小するバンドパスフ
ィルターをLEDと光ファイバーの間に挿入することが
よく行なわれている。
1 as a light source when measuring the connection loss of an optical connector.
.. If a 3m band LED is used, the loss of the optical connector will be estimated to be higher than the actual loss due to the influence of light absorption by the OHM of the optical fiber, which is in the 1.38 range. To avoid this, it is common practice to insert a bandpass filter between the LED and the optical fiber to reduce the wavelength spread of the LED.

本実施例によれば、バンドパスフィルターを通過した後
の光1をモニターできる。
According to this embodiment, it is possible to monitor the light 1 after passing through the bandpass filter.

第6図に第1の実施例の分解斜視図を示す。61はしE
Dとレンズを内蔵したLEDコリメータ、62はレンズ
を内蔵したコリメータ、63は筐体、他の符号は第1図
と同じである。
FIG. 6 shows an exploded perspective view of the first embodiment. 61 Hashi E
D is an LED collimator with a built-in lens, 62 is a collimator with a built-in lens, 63 is a housing, and other symbols are the same as in FIG.

第7図に本実施例で用いられる反射部材の斜視図を示す
FIG. 7 shows a perspective view of the reflective member used in this example.

反射部材は、反射面の一部に穴がおいていれば第7図の
ような形である必要はない。
The reflecting member does not need to have the shape shown in FIG. 7 as long as a hole is provided in a part of the reflecting surface.

(発明の効果) 以上述べたように、本発明によれば、LEDを出射し、
光ファイバーへ入射・伝播する先遣の損失を伴なうこと
なく、光ファイバーへの入射光量をモニターすることが
できる。
(Effect of the invention) As described above, according to the present invention, the LED is emitted,
It is possible to monitor the amount of light incident on the optical fiber without causing any loss in the amount of light that enters and propagates into the optical fiber.

モニターされた光量で、LED駆動電流にフィード・バ
ックをかけることにより、高出力、高安定な、LED光
源を実現することが可能である。
By applying feedback to the LED drive current using the monitored light amount, it is possible to realize a high-output, highly stable LED light source.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の実施例を示す図、第2図は従来の技術
を説明する為の図、第3図、第4図及び第5図は本発明
の他の実施例を示す図、第6図は本発明の実施例を示す
分解斜視図、第7図番よ本発明の実施例で用いられてい
る反射部材の一例を示す斜視図である。 1・・・LED 2・・・受光素子 3・・・光ファイバー 4.5.10・・・球レンズ 6・・・GRINレンズ 7・・・反射部材 8・・・反射面 9・・・穴 出願人  セイコー電子工業株式会社 第7図
FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining a conventional technique, FIGS. 3, 4, and 5 are diagrams showing other embodiments of the present invention, FIG. 6 is an exploded perspective view showing an embodiment of the present invention, and FIG. 7 is a perspective view showing an example of a reflective member used in the embodiment of the present invention. 1... LED 2... Light receiving element 3... Optical fiber 4.5.10... Ball lens 6... GRIN lens 7... Reflective member 8... Reflective surface 9... Hole application People Seiko Electronics Industries Co., Ltd. Figure 7

Claims (1)

【特許請求の範囲】 a)発光素子と b)該発光素子から出射した光を平行光にするための少
なくとも1個のレンズと、 c)前記平行光の一部を反射させる反射部材と、d)反
射されない平行光を光ファイバーに集光するレンズと、 e)前記反射光を受光するための受光素子とからなる発
光モジュールにおいて、 前記反射部材は、前記平行光に対して所定角に傾斜し、
平行光光路全域を閉塞するように置かれた反射面を有し
、前記平行光路域内の前記反射面の一部に前記平行光を
そのまま通過させるための透孔を設けてなる発光モジュ
ール。
[Scope of Claims] a) a light emitting element; b) at least one lens for converting light emitted from the light emitting element into parallel light; c) a reflecting member for reflecting a portion of the parallel light; d ) a lens for condensing unreflected parallel light onto an optical fiber; and e) a light-receiving element for receiving the reflected light.
A light emitting module having a reflective surface placed so as to block an entire parallel light path, and a part of the reflective surface within the parallel light path area having a through hole for allowing the parallel light to pass through as it is.
JP8151686A 1986-04-09 1986-04-09 Light emitting module Pending JPS62237409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8151686A JPS62237409A (en) 1986-04-09 1986-04-09 Light emitting module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8151686A JPS62237409A (en) 1986-04-09 1986-04-09 Light emitting module

Publications (1)

Publication Number Publication Date
JPS62237409A true JPS62237409A (en) 1987-10-17

Family

ID=13748508

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8151686A Pending JPS62237409A (en) 1986-04-09 1986-04-09 Light emitting module

Country Status (1)

Country Link
JP (1) JPS62237409A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100474944B1 (en) * 2002-06-21 2005-03-10 (주)테라디안 Housing of transmitter
WO2019013313A1 (en) * 2017-07-14 2019-01-17 株式会社エンプラス Optical receptacle and optical module
WO2020036140A1 (en) * 2018-08-14 2020-02-20 株式会社エンプラス Optical receptacle and optical module

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100474944B1 (en) * 2002-06-21 2005-03-10 (주)테라디안 Housing of transmitter
WO2019013313A1 (en) * 2017-07-14 2019-01-17 株式会社エンプラス Optical receptacle and optical module
JP2019020575A (en) * 2017-07-14 2019-02-07 株式会社エンプラス Optical receptacle and optical module
WO2020036140A1 (en) * 2018-08-14 2020-02-20 株式会社エンプラス Optical receptacle and optical module

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