Patent ID: 6931215

Claim:
An optical transmitter module comprising: an optical semiconductor element; an inline optical isolator member comprising an optical isolator, a first optical fiber disposed on a side face of said optical isolator and facing to said optical semiconductor element, and a second optical fiber disposed on another side of said optical isolator and communicating to outside; a package case containing said optical semiconductor element; a thermoelectric cooler provided in said package case; a substrate member mounted on the thermoelectric cooler, in said package case; and a pipe-like support member projecting from a side face of said package case, wherein said inline optical isolator member is introduced from said pipe-like support member into said package case, wherein said first optical fiber is fixed at a distal end to said substrate member so as to optically couple to said optical semiconductor element, and wherein said optical isolator has an area fixed in said pipe-like support member, said area being jointed on its whole perimeter to a distal end of said pipe-like support member so as to be fixed to said pipe-like support member.