Optical module outputting polarization combined optical beam

摘要

A transmitter optical module for emitting a polarization polarized combined beam is disclosed. The transmitter optical module includes optical sources each emitting optical beams with substantially the same polarizations, an optical isolator, and a polarization beam combiner. The optical isolator, by receiving the optical beams, outputs the optical beams with polarizations perpendicular to each other to the polarization beam combiner.

主权项

1. A transmitter optical module, comprising:
first and second optical sources that emit first and second optical beams, respectively; a polarization beam combiner that combines the first optical beams with the second optical beam; and an optical isolator including a first unit and a second unit, the first unit receives the first optical beam output by the first optical source and provides the first optical beam to the polarization beam combiner, the first optical beam containing only a first polarization, the second unit receives the second optical beam output from the second optical source and provides the second optical beam to the polarization beam combiner, the second optical beam containing only a second polarization perpendicular to the first polarization to the polarization beam combiner, wherein the first unit of the optical isolator includes a polarization dependent isolator and a wave plate in an output of the polarization dependent isolator, the wave plate having a crystallographic c-axis inclined by a quarter of a right angle from a transmission axis of the polarization dependent isolator, and wherein the second unit of the optical isolator includes a polarization dependent isolator and a wave plate in an output of the polarization dependent isolator of the second unit, the wave plate of the second unit having a crystallographic c-axis making a right angle against the crystallographic c-axis of the wave plate of the first unit.