Patent application number | Description | Published |
20110303949 | SEMICONDUCTOR LIGHT-RECEIVING ELEMENT - A semiconductor light-detecting element includes: a semiconductor substrate of a first conductivity type; a light absorption recoupling layer of the first conductivity type, a multilayer reflection film of the first conductivity type, a light absorbing layer, and a window layer, which are laminated, in that order, on the semiconductor substrate; a doped region of a second conductivity type in part of the window layer; a first electrode connected to the doped region; and a second electrode connected to an underside of the semiconductor substrate. The band gap energy of the window layer is larger than the band gap energy of the light absorbing layer, and the band gap energy of the light absorption recoupling layer is smaller than the band gap energy of the semiconductor substrate. | 12-15-2011 |
20120299141 | AVALANCHE PHOTODIODE AND AVALANCHE PHOTODIODE ARRAY - An avalanche photodiode including a semiconductor substrate of a first conductivity type, an avalanche multiplication layer, an electric field control layer, a light absorption layer, and a window layer wherein the layers are laid one on another in this order on a major surface of the semiconductor substrate, an impurity region of a second conductivity type in a portion of the window layer, and a straight electrode on the impurity region and connected to the impurity region, the straight electrode being straight as viewed in a plan view facing the major surface of the semiconductor substrate. | 11-29-2012 |
20130207160 | SEMICONDUCTOR LIGHT DETECTING ELEMENT - A semiconductor light detecting element includes: an InP substrate; and a semiconductor stacked structure on the InP substrate and including at least a light absorbing layer, wherein the light absorbing layer includes an InGaAsBi layer lattice-matched to the InP substrate. | 08-15-2013 |
20130208350 | OPTICAL SEMICONDUCTOR DEVICE - An optical semiconductor device includes: semiconductor lasers; a wave coupling section multiplexing light output by the semiconductor lasers; an optical amplifying section amplifying output light of the wave coupling section; a first optical waveguide optically connecting respective semiconductor lasers to the wave coupling section; a second optical waveguide optically connecting the wave coupling section to the optical amplifying section; a third optical waveguide optically connected to an output of the optical amplifying section; and a phase regulator located in at least one of the first, second, and third optical waveguides, and regulating phase of reflected light that is reflected at a reflecting point in the optical semiconductor device and that returns to the semiconductor lasers. The phase regulator adjusts the phase of the reflected light to decrease line width of the light output by the semiconductor lasers. | 08-15-2013 |
20140056556 | OPTICAL SEMICONDUCTOR DEVICE - An optical semiconductor device includes: semiconductor lasers separated into two groups; an optical coupler combining light output from the semiconductor lasers; an optical amplifier amplifying light output from the optical coupler; and waveguides respectively connecting the semiconductor lasers to the optical coupler. Each of the waveguides includes a respective bent waveguide. The bent waveguides have the same radius of curvature. | 02-27-2014 |
20140198378 | OPTICAL SEMICONDUCTOR DEVICE - An optical semiconductor device includes: semiconductor lasers; a wave coupling section multiplexing light output by the semiconductor lasers; first optical waveguides respectively optically connecting respective semiconductor lasers to the wave coupling section; a phase regulator regulating phase of reflected light that is reflected at a reflecting point located in the optical semiconductor device and that returns to the semiconductor lasers; a second optical waveguide optically connecting the wave coupling section to the phase regulator; an optical amplifying section amplifying output light of the phase regulator; and a third optical waveguide optically connecting an output of the phase regulator to the optical amplifying section. The phase regulator adjusts the phase of reflected light that returns to the semiconductor lasers to decrease line width of the light output by the semiconductor lasers. | 07-17-2014 |
20150229407 | OPTICAL SEMICONDUCTOR DEVICE - An optical semiconductor device includes: semiconductor lasers; a wave coupling section multiplexing light output by the semiconductor lasers; an optical amplifying section amplifying output light of the wave coupling section; first optical waveguides respectively optically connecting respective semiconductor lasers to the wave coupling section; a light intensity lowering section located in each of the first optical waveguides and lower light intensity of reflected light that is reflected at a reflecting point located in the optical semiconductor device and that returns to the respective semiconductor lasers; to decrease line width of the light output by the semiconductor lasers. | 08-13-2015 |