Mitsubishi Electric

About: Mitsubishi Electric is a company organization based out in Ratingen, Germany. It is known for research contribution in the topics: Signal & Voltage. The organization has 23024 authors who have published 27591 publications receiving 255671 citations. The organization is also known as: Mitsubishi Electric Corporation & Mitsubishi Denki K.K..

InGaAsP/InP buried crescent laser emitting at 1.3 μm with very low threshold current

Abstract: An InGaAsP/InP injection laser is described in which a crescent-shaped InGaAsP active region is completely embedded in InP by the etch-and-fill l.p.c. technique and a double current confinement scheme is incorporated with two reverse-biased p-n junctions on both sides of the active layer. The best laser has the very low threshold current of 28 mA c.w. at room temperature, and shows stable single-mode c.w. operation up to about twice the threshold current.

28% electrical-efficiency operation of a diode-side-pumped Nd:YAG rod laser.

Abstract: We propose a highly efficient quasi-cw Nd:YAG rod laser with a novel side-pumping design that uses microlens-free diode stacks We demonstrate 320-W output power with 28% electrical-to-optical efficiency, which is, to our knowledge, the highest efficiency reported for diode-pumped solid-state lasers

Stereoscopic image display device

Abstract: PROBLEM TO BE SOLVED: To provide a stereoscopic image display which prevents occurrence of ghost caused by response delay of a liquid crystal and prevents occurrence of luminance non-uniformity. SOLUTION: A gradation value conversion table for compensating for delay of a response by accelerating a response speed of the liquid crystal to a gradation change by intensifying a gradation voltage for image display of a latest field and giving it to a liquid crystal display panel 28 as a compensated gradation voltage is prepared for each of gate lines of the liquid crystal display panel 28, thereby compensating for a gradation value to change an application voltage in accordance with the time from data write to ON of a light source. COPYRIGHT: (C)2006,JPO&NCIPI

A DBF self-beam steering array antenna for mobile satellite applications using beam-space maximal-ratio combination

Abstract: This paper proposes a diversity-receiving array antenna scheme achieved by digital beamforming (DBF) for the purpose of self-beam steering toward the unknown direction-of-arrival (DOA) of a modulated signal in a mobile satellite communications environment. This scheme uses a multibeam former with a spatial fast Fourier transform (FFT) for the received baseband signals to coarsely acquire the attenuated signal. It also uses a self-phasing processor (SPP) applied to the multibeam outputs for precise acquisition and tracking. In the SPP, maximal-ratio combining is achieved with simple digital numerical operations in the complex baseband, allowing for rapidity and stability in beamforming. As a result, the array antenna steers its receiving beam toward the DOA automatically without the need for nonlinear optimization methods. Moreover, the beam is steered toward the DOA of multipath signals according to their signal levels, leading to the optimal cophase recombination of all correlated signals, which improves the quality of the total receiving signal. This paper discusses the scheme, and its performance is evaluated by computational simulation and experiments conducted in a radio anechoic chamber.