Abstract:
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.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 λin the 1.55 μm band and an active layer 13b having a gain wavelength λin 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 λand λ, and in which a diffraction grating 20 with a Bragg wavelength equal to the shorter gain wavelength λis formed in the vicinity of the active layer 13b having the shorter gain wavelength λand 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.
Abstract:
PROBLEM TO BE SOLVED: To reduce facet degradation of a II-VI semiconductor laser diode having a semiconductor body comprising a plurality of semiconductor layers forming a pn junction, a facet at one end of the body, and a reference electrode. SOLUTION: The laser diode 10 further includes a facet degradation reduction electrode 50 located adjacent to the facet 34. The facet degradation reduction electrode 50 is electrically isolated from a forward bias electrode 40. The facet degradation reduction electrode 50 is used to establish an electric field sufficient to reduce facet degradation. In one embodiment, this electric field is established by applying a reverse-bias voltage VRB between the facet degradation reduction electrode 50 and the reference electrode 32. In another embodiment, this electric field is established by electrically connecting the facet degradation reduction electrode 50 to the reference electrode 32. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor laser device and optical integrated semiconductor device which continuously change the lasing wavelength while suppressing mode hopping more reliably. SOLUTION: A distributed feedback semiconductor laser device 10 in which the lasing wavelength is changed includes: a semiconductor layer portion 20 including a first active layer 20A, a second active layer 20B, and an intermediate layer 20C that optically couples the first active layer and the second active layer, the first active layer, the intermediate layer, and the second active layer being arranged in this order in a predetermined axis direction; a diffraction grating 26 that is optically coupled with the first active layer 20A and the second active layer 20B of the semiconductor layer portion 20; a first electrode 28A for injecting carriers into the first active layer 20A; a second electrode 28B for injecting carriers into the second active layer 20B; and a third electrode 28C for supplying the intermediate layer 20C with electric current, wherein the diffraction grating 26 extends in the predetermined axis direction, and a period Λ of the diffraction grating is uniform in the predetermined axis direction. COPYRIGHT: (C)2009,JPO&INPIT