Topic
Optical modulator
About: Optical modulator is a research topic. Over the lifetime, 14068 publications have been published within this topic receiving 196932 citations.
Papers published on a yearly basis
Papers
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23 Jan 1991TL;DR: In this article, a projector capable of compactizing the structure and improving the efficiency of light utilization is described, where the first and second lights of mutually different colors are emitted from the illumination optical system.
Abstract: A projector capable of compactizing the structure and improving the efficiency of light utilization is disclosed. The projector has an illuminating system, a light modulation device and a projection optical system. A first and a second lights of mutually different colors are emitted from the illumination optical system. The light modulating device has a first light modulator for modulating the first light according to a first image signal and a second light modulator for modulating the second light according to a second image signal. Each of the first and second light modulators is provided with a grating, a liquid crystal filled in the grooves of the grating and a driver for driving the molecules of the liquid crystal. The driver is adapted to drive the molecules of the liquid crystal in such a manner that the liquid crystal and the grating have mutually substantially matching refractive indexes in a certain state but have mutually unmatched refractive indexes in another state, thereby generating or substantially erasing a diffraction grating by the grating and the liquid crystal. A first and a second images of mutually different colors are projected on a screen by the first and second lights from the first and second light modulators.
100 citations
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22 Aug 2003
TL;DR: In this paper, a high performance optical integrated semiconductor element and a method of manufacturing the same wherein an optical integrated circuit using semiconductor crystal of Si, GaAs, InP or the like may be manufactured easily, high speed modulation can be realized using a dielectric material waveguide modulator, and the waveguide and light receiving element/light emitting element may be allocated through higher optical coupling efficiency.
Abstract: PROBLEM TO BE SOLVED: To provide a high performance optical integrated semiconductor element and a method of manufacturing the same wherein an optical integrated circuit using semiconductor crystal of Si, GaAs, InP or the like may be manufactured easily, high speed modulation can be realized using a dielectric material waveguide modulator, and the waveguide and light receiving element/light emitting element may be allocated through higher optical coupling efficiency. SOLUTION: The semiconductor device is provided with a first oxide dielectric material substrate, an optical modulator formed on the first oxide dielectric material substrate by growth of a first semiconductor crystal on the oxide dielectric material substrate, a semiconductor laser device including a first active layer to the semiconductor crystal region formed on the first oxide dielectric material substrate, a semiconductor optical detector including a second active layer, an optical modulator drive circuit, and a semiconductor optical detector/semiconductor laser drive circuit. COPYRIGHT: (C)2003,JPO
100 citations
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TL;DR: Optical interconnects integrated with lasers, silicon optical modulators and germanium photodetectors on a single silicon substrate were demonstrated for the first time, achieving a 5 Gbps line bit rate and 3 Tbps/cm2 transmission density.
Abstract: Engineers are currently facing some technical issues in support of the exponential performance growths in information industries. One of the most serious issues is a bottleneck of inter-chip interconnects. We propose a new “Photonics-Electronics Convergence System” concept. High density optical interconnects integrated with a 13-channel arrayed laser diode, silicon optical modulators, germanium photodetectors, and silicon optical waveguides on single silicon substrate were demonstrated for the first time using this system. A 5-Gbps error free data transmission and a 3.5-Tbps/cm2 transmission density were achieved. We believe that this technology will solve the bandwidth bottleneck problem among LSI chips in the future.
100 citations
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TL;DR: In this paper, the modulation bandwidth and drive voltage for optical resonator-based modulators are compared with lumped element Mach-Zehnder (MZ) modulators and with traveling wave MZ modulators.
Abstract: Expressions for the modulation bandwidth and drive voltage for optical resonator-based modulators are presented. A comparison with lumped element Mach-Zehnder (MZ) modulators and with traveling wave MZ modulators is presented.
100 citations
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TL;DR: Helico-conical optical beams, different from higher-order Bessel beams, are generated with a parallel-aligned nematic liquid crystal spatial light modulator by multiplying helical and conical phase functions leading to a nonseparable radial and azimuthal phase dependence.
Abstract: Helico-conical optical beams, different from higher-order Bessel beams, are generated with a parallel-aligned nematic liquid crystal spatial light modulator (SLM) by multiplying helical and conical phase functions leading to a nonseparable radial and azimuthal phase dependence. The intensity distributions of the focused beams are explored in two- and three-dimensions. In contrast to the ring shape formed by a focused optical vortex, a helico-conical beam produces a spiral intensity distribution at the focal plane. Simple scaling relationships are found between observed spiral geometry and initial phase distributions. Observations near the focal plane further reveal a cork-screw intensity distribution around the propagation axis. These light distributions, and variations upon them, may find use for optical trapping and manipulation of mesoscopic particles.
100 citations