公开(公告)号：EP1298476A3

公开(公告)日：2004-07-21

申请号：EP02001360.3

申请日：2002-01-18

申请人： OpNext Japan, Inc.

发明人： Matsushia, Naoki, c/o Hitachi, Ltd., Intell. Prop. ,  Kawamoto, Kazumi, c/o Hitachi, Ltd., Intell. Prop. ,  Tonehira, Koichi, c/o OpNext Japan, Inc.

IPC分类号： G02B6/42

CPC分类号： G02B6/4225 ,  G02B6/4204 ,  G02B6/4206 ,  G02B6/4237

摘要： A semiconductor laser 1 and an optical fiber 4 are optically coupled via a first lens 2 and a second lens 3, the second lens is previously fixed to a module package 5 and the parts are mounted to the module package, when focal lengths of the first lens and the second lens are respectively designated by f1 and f2, an optical distance d between a principal plane 32 of the first lens on its side facing the second lens and a principal plane 33 of the second lens on its side facing the first lens, is made substantially equal to f1+f2. Thereby, there is provided an optical transmission module having low price capable of achieving a high coupling efficiency with high yield.