Patent ID: 6865006
Filing Date: 2005-03-08
Classification: G02B,H01S

Abstract:
1. An optical modulator module including, in same package, a semiconductor laser as light source, an optical modulation device having optical waveguide on a surface of a chip made of material with electro-optical effect, and a polarization rotating element between said semiconductor laser and said optical modulation device, for bringing plane of polarization of light from said semiconductor laser to optimum plane of polarization in waveguide of said optical modulation device in line and blocking returning light from said optical modulation device to said semiconductor laser, including said polarization rotating element that allocates, from a side of said semiconductor laser, first polarizer that transmits a main polarization component of semiconductor laser, first faraday element that rotates 45° of transmitting light against the transmission axial of said first polarizer, second polarizer with the transmission axial that transmits the output polarization of said first faraday element, second faraday element that rotates 45° of said second polarizer transmitting light in same direction of first faraday element, and means that gives the magnetic field to said first and second faraday elements on optical axis in same direction.