JPH0160209U

JPH0160209U -

Info

Publication number: JPH0160209U
Application number: JP15631287U
Authority: JP
Priority date: 1987-10-13
Filing date: 1987-10-13
Publication date: 1989-04-17

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す光結合器で
あるＬＤモジユールを示す断面図、第２図は第１
図に示すＬＤモジユールの光軸合せの一実施例を
示す図、第３図はこの考案の他の実施例を示す光
結合器であるＰＤモジユールを示す断面図、第４
図は第３図に示すＰＤモジユールの光軸合せの一
実施例を示す図、第５図は従来の光結合器である
ＬＤモジユールを示す断面図である。図において、１はＬＤ、２はステム、３は第１
のレンズ、４は第２のレンズ、５は光フアイバ、
６はフエルール、７は凹レンズ、８は凸レンズ、
９はスリーブ、１０はＰＤである。なお、図中同
一あるいは相当部分には同一符号を付して示して
ある。 Fig. 1 is a cross-sectional view showing an LD module which is an optical coupler showing one embodiment of this invention, and Fig.
FIG. 3 is a sectional view showing a PD module which is an optical coupler showing another embodiment of this invention; FIG.
This figure shows an example of optical axis alignment of the PD module shown in FIG. 3, and FIG. 5 is a sectional view showing an LD module which is a conventional optical coupler. In the figure, 1 is the LD, 2 is the stem, and 3 is the first
4 is a second lens, 5 is an optical fiber,
6 is a ferrule, 7 is a concave lens, 8 is a convex lens,
9 is a sleeve, and 10 is a PD. It should be noted that the same or corresponding parts in the figures are indicated by the same reference numerals.

Claims

[Claims for Utility Model Registration] (1) An optical element attached to the center of the stem;
an optical fiber attached to the center of the ferrule; a first lens located between the optical element and the optical fiber for collimating light from the optical element or the optical fiber; and the first lens. a second lens provided opposite to the first lens for condensing the light parallelized by the first lens and coupling it to the optical fiber or optical element, the first lens and the second lens;
a concave lens which is provided between the lenses and has one side flat and the other concave, and a convex lens where one side is flat and the other side is a convex surface with a curvature approximately equal to the curvature of the concave surface of the concave lens. are in close contact with each other; the stem; and the first lens;
a sleeve having the same inner diameter as the outer diameter of the lens, the second lens, and the ferrule, and for holding and fixing the stem, the first lens, the second lens, the ferrule, and the combined lens; An optical coupler characterized by comprising: (2) The optical coupler according to claim 1, which is a registered utility model, characterized in that when the optical element is used as a light emitting element, the optical fiber is used for receiving light. (3) The optical coupler according to claim 1, wherein the optical fiber is used for light emission when the optical element is used as a light receiving element.