SEMICONDUCTOR LASER WITH WEAKLY COUPLED GRATING

摘要

PROBLEM TO BE SOLVED: To propose a semiconductor laser whose side mode compression ratio and single mode stability are excellent. SOLUTION: The semiconductor laser 33 with a semiconductor substrate 36, a laser layer 37 arranged on the semiconductor substrate, a waveguide 40 arranged parallel to the laser layer and a stripe shaped grating structure 39 is disclosed. The laser layer 37, the waveguide 40 and the grating structure 39 are arranged in a configuration which results in weak coupling between the laser light and the grating structure 39, so that the laser light interacts with an increased number of grating elements.