Semiconductor laser device for use in a semiconductor laser module and optical amplifier

摘要

A single semiconductor laser device (2) used in a semiconductor laser module of an optical amplifier (48) and having a first light emitting stripe (9) with a diffraction grating (75) and at least one other light emitting stripe (10) with a diffraction grating (75) and which are aligned to respectively emit a first laser beam and at least one other laser beam through one edge surface.