Semiconductor light emitting element, driving method of semiconductor light emitting element, light emitting device, and optical pulse tester using light emitting device

Abstract

[Task] To provide a semiconductor light emitting element capable of emitting light beams with wavelengths in a plurality of wavelength ranges with a high optical output, a driving method of a semiconductor light emitting element capable of making a semiconductor light emitting element that can emit light beams with wavelengths in a plurality of wavelength ranges operate with a high optical output, a light emitting device, and a small and high-performance optical pulse tester using the light emitting device. [Means for Resolution] In a driving method of a semiconductor light emitting element with a configuration in which an active layerwith a gain wavelength λof about 1.55 μm and an active layerwith a gain wavelength λof about 1.3 μm are optically coupled along the guiding direction of light and are disposed in series in order of the length of the gain wavelengths λand λand a diffraction gratingwith a Bragg wavelength of the short gain wavelength λis formed near the active layerwith the short gain wavelength λand near a butt-joint coupling portionbetween the active layersand, an upper electrode provided above the active layeris short-circuited to a lower electrode provided on a bottom surface of a semiconductor substrate so that a leakage current does not flow into the active layerwhen a driving current is applied to the active layer