Patent ID: 7177549

Claim:
An optical module comprising: a module package; an optical modulator integrated semiconductor laser contained in said module package; a lens to irradiate light emitted from said semiconductor laser such that said light is substantially focused on an end portion of an optical fiber provided in an exterior of said module package; and a high-frequency transmission line to supply a high-frequency signal input from said exterior of said module package to said semiconductor laser, wherein said high-frequency transmission line comprises: a substrate; a signal wiring conductor provided on or in said substrate, said signal wiring conductor having a first portion; a second portion of said signal wiring conductor provided on or in said substrate and disposed such that said second portion of said signal wiring conductor substantially intersects with said first portion of said signal wiring conductor; and a bending portion of said signal wiring conductor that interconnects said first and second portions of said signal wiring conductor, wherein an outer side of said bending portion of said signal wiring conductor is chamfered so as to provide an outer signal conductor intermediary side and a triangular conductor is disposed to an inner side of said bending portion so as to provide an inner signal conductor intermediary side, and wherein given that length of said outer signal conductor intermediary side is defined as a and length of said inner signal conductor intermediary side is defined as b and width of said respective first and second portions of said signal wiring conductors is defined as c, it is arranged such that a is greater than (b+c×square root of 2).