JPS62197873U

JPS62197873U -

Info

Publication number: JPS62197873U
Application number: JP8548286U
Authority: JP
Priority date: 1986-06-06
Filing date: 1986-06-06
Publication date: 1987-12-16

Description

[Brief explanation of the drawing]

第１図は本考案に係る光フアイバ用安定化光源
の一実施例の縦断面図、第２図は本実施例で使用
している第１のレンズホルダの一例を示す斜視図
、第３図及び第４図は従来の光フアイバ用安定化
光源の２種の例を示した縦断面図、第５図Ａ，Ｂ
はＬＤの接合面とビームスプリツターでの反射光
の関係を示す斜視図、第６図は第５図Ａ，Ｂに示
す状態でのビームスプリツターの傾斜角度と反射
率との関係を示す線図である。１……レーザダイオード、２，３……第１、第
２の収束レンズ、４……レンズ系、５……光フア
イバ、６……フオトダイオード、７……光出力検
出回路、８……差動増幅回路、９……制御信号源
、１０……電流制御回路、１３……ビームスプリ
ツター、１４……レンズ付ＰＤ、１５……収束レ
ンズ、１６……ケース、２１……第１のレンズホ
ルダ、２２……第２のレンズホルダ、２３……収
束光、２３Ａ……収束分配光、２４……反射面。 FIG. 1 is a longitudinal sectional view of an embodiment of the stabilized light source for optical fiber according to the present invention, FIG. 2 is a perspective view showing an example of the first lens holder used in this embodiment, and FIG. 3 and Fig. 4 are vertical sectional views showing two types of conventional stabilized light sources for optical fibers, and Fig. 5 A and B.
6 is a perspective view showing the relationship between the bonded surface of the LD and the reflected light from the beam splitter, and FIG. 6 is a line showing the relationship between the inclination angle of the beam splitter and the reflectance in the states shown in FIGS. 5A and B. It is a diagram. 1... Laser diode, 2, 3... First and second converging lenses, 4... Lens system, 5... Optical fiber, 6... Photo diode, 7... Optical output detection circuit, 8... Difference Dynamic amplifier circuit, 9... Control signal source, 10... Current control circuit, 13... Beam splitter, 14... PD with lens, 15... Converging lens, 16... Case, 21... First lens Holder, 22...Second lens holder, 23...Convergent light, 23A...Convergent distributed light, 24...Reflecting surface.

Claims

[Scope of utility model registration request]

When the optical output from the laser diode is made to enter the optical fiber through the lens system, a beam splitter is arranged in the lens system to take out a part of the optical output as a distributed optical output and convert it into a photodiode with a converging lens. The monitor signal output is input to a differential amplifier circuit and compared with a control signal from a control signal source to form a difference signal, and the difference signal is input to a current control circuit. In a stabilized light source for an optical fiber that forms a laser diode applied current according to the difference signal and applies it to the laser diode, the lens system converts the optical output of the laser diode into convergent light and applies it to the optical fiber. The first converging lens, which is located on the laser diode side, is supported by a first lens holder, and the second converging lens is located on the optical fiber side. is supported by the second lens holder, the first and second lens holders are each supported by a case incorporating the laser diode, the lens system, the beam splitter, and the photodiode with a converging lens, and the beam splitter The tube is disposed at a position crossing the convergent light and supported by the second lens holder at an angle smaller than 45° with respect to a plane perpendicular to the optical axis of the convergent light,
A stabilized light source for an optical fiber, characterized in that the first lens holder is provided with a reflecting surface that reflects the convergent and distributed light from the beam splitter and makes it incident on the photodiode with a convergent lens.