Title: Passive mode-locked synchronization semiconductor laser, and optical clock signal extracting device
Application Number: 200610146855 Application Date: 2006.11.27
Publication Number: 1983749 Publication Date: 2007.06.20
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H01S5/065;H01S5/00
Applicant(s) Name: Oki Electric Ind Co., Ltd. Address:
Inventor(s) Name: Arahira Shin
Attorney & Agent: huanglun wei
Abstract:
    The invention provides an optical clock signal extracting device with a simple configuration, by which an optical clock signal may be extracted without depending on the polarization direction of an input optical signal. A current is injected to a gain region (30) through an n-type common electrode (12) and a p-type electrode (24) in the gain region (30) by a constant current source (28). A reverse-bias voltage is applied by a constant voltage source (26) to a saturable absorption regionthrough the p-type electrode (22) and the n-type common electrode (12) in the saturable absorption region. An optical waveguide (16) in the gain region is formed with bulk crystal or a quantum well structure into which extension strain is introduced, and an optical waveguide (18) in the saturable absorption region is formed with a quantum well structure into which extension strain is introduced. Moreover, in the gain region, an optical gain for the TE mode is configured to be larger than that for the TM mode, and, in the saturable absorption region, absorption saturation energy for the TM mode is configured to be smaller than absorption saturation energy for the TE mode.
Time: 22