Patent ID: 6859298
Filing Date: 2005-02-22
Classification: G02F

Abstract:
1. An optical module of an optical isolator comprising: a semiconductor laser for outputting a first linearly-polarized beam of a predetermined polarization mode; a polarizer positioned to face an end of the semiconductor laser, wherein a polarization axis of the polarizer is at a 45° angle with a polarization direction of the first beam; and a Faraday rotator between the semiconductor laser and the polarizer, wherein said rotator rotates the polarization direction of the first beam by 45° to substantially coincide with the polarization axis of the polarizer and rotates a second beam from the polarizer by 45° and provides the rotated second beam to the semiconductor laser, wherein the second beam has a polarization mode polarized perpendicular to the first beam and the polarization mode of the second beam received by the semiconductor laser after passing through the Faraday rotator is a TM mode.