Patent application number | Description | Published |
20090267195 | SEMICONDUCTOR ELEMENT AND METHOD FOR MANUFACTURING SEMICONDUCTOR ELEMENT - A semiconductor device of present invention comprises a layered structure including a cladding layer with a first conductivity, an active layer, and a cladding layer with a second conductivity which are successively grown on a semiconductor substrate of (001) orientation, and an embedding layer covering both side surfaces of the layered structure in a widthwise direction across a longitudinal direction of the layered structure in a plane parallel to a surface of the semiconductor substrate. A portion of side surfaces of the active layer in the widthwise direction lies parallel to at least (010) or (100) surface. | 10-29-2009 |
20100142026 | SEMICONDUCTOR OPTICAL MODULATOR - An optical modulator is provided with a stripe-shaped optical waveguide, which has an upper clad layer, a lower clad layer formed between the upper clad layer and a substrate, and an undoped core layer which is arranged between the upper clad layer and the lower clad layer and has a complex refractive index that changes corresponding to the intensity of an applied electric field, to a signal light propagating inside. On the both sides of the stripe-shaped optical waveguide, conductor walls are configured by arranging a pair of parallel blocking flat boards with an insulating wall in between. Thus, the semiconductor optical modulator having a high optical modulation efficiency is provided | 06-10-2010 |
20110002575 | WAVEGUIDE-TYPE SEMICONDUCTOR OPTICAL MODULATOR AND METHOD FOR MANUFACTURING THE SAME - Provided is a traveling-wave type semiconductor optical phase modulator capable of high speed and low voltage operation by improving an n-SI-i-n-type layered structure. A first exemplary aspect of the present invention is a waveguide-type semiconductor optical modulator including: a semiconductor substrate ( | 01-06-2011 |
20110135251 | WAVELENGTH-TUNABLE OPTICAL TRANSMITTER - A first exemplary aspect of the present invention is a wavelength-tunable optical transmitter including: a semiconductor substrate ( | 06-09-2011 |
20110188804 | OPTICAL JOINT - An optical joint ( | 08-04-2011 |
20110204287 | VOLTAGE NONLINEAR RESISTOR, LIGHTNING ARRESTER EQUIPPED WITH VOLTAGE NONLINEAR RESISTOR, AND PROCESS FOR PRODUCING VOLTAGE NONLINEAR RESISTOR - A voltage nonlinear resistor is made of a sintered body that mainly includes zinc oxide grains, spinel grains including zinc and antimony as main ingredients, and a bismuth oxide phase, in which the bismuth oxide phase includes at least one of alkali metals selected from the group of potassium and sodium at a ratio in the range of 0.036 at % or higher and 0.176 at % or lower. The voltage nonlinear resistor has good voltage nonlinearity and loading service life characteristics, and can be used for a lightning arrester. | 08-25-2011 |
20110317956 | SEMICONDUCTOR OPTICAL MODULATOR, SEMICONDUCTOR OPTICAL INTEGRATED DEVICE, AND METHOD OF MANUFACTURING THE SAME - The invention provides a semiconductor optical modulator including a two-step mesa optical waveguide having a first clad layer ( | 12-29-2011 |
20120183249 | SEMICONDUCTOR OPTICAL MODULATOR AND SEMICONDUCTOR MACH-ZEHNDER OPTICAL MODULATOR - Provided are a semiconductor optical modulator and a semiconductor Mach-Zehnder optical modulator of high efficiency and high reliability. | 07-19-2012 |
20120251032 | OPTICAL MODULATOR MODULE AND METHOD FOR MODULATING OPTICAL SIGNAL - The present invention provides a compact, broad-band, and low-drive-voltage optical modulator module capable of generating any multilevel optical modulation. The optical modulator module according to an exemplary aspect of the present invention includes a digital segmented electrode structure optical modulator and m individual driving circuits. The digital segmented electrode structure optical modulator includes semiconductor optical waveguides and at least m waveguide-type optical phase modulator regions. An i-th individual driving circuit includes a driving circuit and a phase shift circuit. The driving circuit amplifies a digital input signal in synchronization with a clock signal and outputs the signal to an i-th waveguide-type optical phase modulator region. The phase shift circuit applies a delay to a signal branched from the clock signal. A j-th individual driving circuit receives an output signal from the phase shift circuit of a (j−1)-th individual driving circuit as a clock signal. | 10-04-2012 |
20130272700 | OPTICAL SIGNAL CONTROL DEVICE AND OPTICAL SIGNAL CONTROL METHOD - An optical signal control device includes an optical signal control unit and a drive circuit. The optical signal control unit includes m number of optical waveguides for propagating carrier light and (m×n) number of interaction regions, n number of interaction regions formed on each of the optical waveguides. The drive circuit includes (m×n) number of phase control units. The (m×n) number of phase control unit output a data signal for controlling the action of the (m×n) number of interaction regions to each of the (m×n) number of interaction regions. Each of the (m×n) number of phase control units outputs the data signal so that timing when the carrier light propagates to the interaction region to output the data signal and timing when the data signal arrives at the interaction region are synchronized. One of m and n is two or more. | 10-17-2013 |
20140169723 | OPTICAL MODULATOR MODULE, INTEGRATED CIRCUIT FOR DRIVING OPTICAL MODULATOR, AND METHOD FOR MODULATING OPTICAL SIGNAL - Waveguide-type optical phase modulator regions of a linear accelerator-type column electrode structure MZ optical modulator are arranged on a semiconductor optical waveguide. A transmission line of an integrated circuit receives a clock signal through a buffer circuit disposed on an input side. Clock terminators are connected between an end of the transmission line and clock terminator power supply electrodes (VCa, VCb). Individual driving circuits receive the clock signal from different positions of the transmission line. An i (1≦i≦m, i is an integer)-th individual driving circuit counted from the input side outputs a signal obtained by amplifying a digital input signal in synchronization with the clock signal to an i-th waveguide-type optical phase modulator region. | 06-19-2014 |
20140233962 | OPTICAL MODULATOR MODULE AND MODULATION METHOD FOR OPTICAL SIGNAL - An optical modulator module includes an optical modulator including an optical waveguide which conducts an inputted optical signal, and m modulator regions on the optical waveguide; and m discrete driving circuits serially connected to one another. The discrete driving circuits include a driving circuit which outputs a signal obtained from a digital input signal with a synchronization signal to one of the modulator regions, and a phase shifting circuit which outputs a signal resulting from giving a delay to a signal branched from the synchronization signal. A discrete driving circuit receives the signal outputted from the phase shifting circuit. Each of the modulator regions includes modulation electrodes, an electric field caused by a modulation electric signal applied to each of the modulation electrodes penetrates by a penetration length d, and every two adjacent modulation electrodes has a distance L | 08-21-2014 |