| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor light-emitting element which emits light having a plurality of wavelength bands, especially, oscillating light having a plurality of different wavelength bands in a plurality of longitudinal modes, respectively, and can be manufactured with a high output and a high yield, and to provide a compact and low-priced optical pulse tester using the same. SOLUTION: An MQW active layer 13a having a gain wavelengthλ<SB>1</SB>in a 1.55μm band and an MQW active layer 13b having a gain wavelengthλ<SB>2</SB>in a 1.3μm band are optically coupled to each other in a guiding direction of light via a coupling waveguide layer 19, and arranged in series in the order of the length of the gain wavelengthsλ<SB>1</SB>andλ<SB>2</SB>. The coupling waveguide layer 19 has a composition wavelength shorter than 1.3μm. A diffraction grating 20 which has a Bragg wavelength that is a short gain wavelengthλ<SB>2</SB>is formed in the vicinity of the coupling waveguide layer 19. COPYRIGHT: (C)2011,JPO&INPIT |
