Patent ID: 7085440

Claim:
A semiconductor laser module comprising: a first stripe and a second stripe formed on a semiconductor substrate, said first stripe and said second stripe being configured to emit respectively a first laser beam and a second laser beam polarized in mutually parallel directions from an end face thereof; at least one first lens configured to transmit said first laser beam and said second laser beam emitted respectively from said first stripe and said second stripe; a polarization direction transforming part including a polarization dependent optical isolator part, said polarization direction transforming part being configured to transform the polarization directions of said first laser beam and said second laser beam emitted respectively from said first stripe and second stripe such that the polarization direction of said first laser beam and the polarization direction of said second laser beam are orthogonal to each other, said polarization dependent optical isolator part being configured to allow said first laser beam and said second laser beam to travel only in one direction; a polarization synthesizer including: a first input port on which said first laser beam emerging from said polarization direction transforming part is incident; a second input port on which said second laser beam emerging from said polarization direction transforming part is incident; and an output port from which said first laser beam emerging from said first input port and second laser beam emerging from said second input port are multiplexed and emitted as a multiplexed laser beam; and an optical fiber positioned to receive the multiplexed laser beam therein.