| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of driving a semiconductor light-emitting element that enables a semiconductor light-emitting element, which can emit light having a plurality of wavelength bands, to operate with high optical output, and to provide a light-emitting device, and a small-sized and high-performance optical pulse tester using the light-emitting device. <P>SOLUTION: There is provided a method of driving a semiconductor light-emitting element, the semiconductor light-emitting element having a structure in which an active layer 13a having a gain wavelength λ<SB POS="POST">1</SB>in the 1.55 μm band and an active layer 13b having a gain wavelength λ<SB POS="POST">2</SB>in the 1.3 μm band are optically coupled with each other in the light waveguide direction and arranged in series in the order of the length of the gain wavelengths λ<SB POS="POST">1</SB>and λ<SB POS="POST">2</SB>, and in which a diffraction grating 20 with a Bragg wavelength equal to the shorter gain wavelength λ<SB POS="POST">2</SB>is formed in the vicinity of the active layer 13b having the shorter gain wavelength λ<SB POS="POST">2</SB>and in the vicinity of a butt joint coupling part 19 between the active layer 13a and the active layer 13b. An upper electrode provided above the active layer 13b and a lower electrode provided on a bottom surface of a semiconductor substrate are short-circuited so that a leakage current does not flow into the active layer 13b when a driving current is applied to the active layer 13a. <P>COPYRIGHT: (C)2012,JPO&INPIT |
