Topic
Optical modulator
About: Optical modulator is a research topic. Over the lifetime, 14068 publications have been published within this topic receiving 196932 citations.
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24 Feb 1986
TL;DR: In this article, a phase-modulated (PM) optical wave with no amplitude modulation propagating in an optical fiber will be adversely affected by group velocity dispersion in the fiber, which causes amplitude modulation of the received signal which in turn leads to a penalty in coherent transmission systems.
Abstract: Coherent detection in lightwave transmission systems can improve receiver sensitivities by 10-20dB over direct detection sensitivities. In phase-shift-keyed (PSK) systems the information is impressed on the phase of the optical field while the amplitude is held nominally constant. A phase-modulated (PM) optical wave with no amplitude modulation propagating in an optical fiber will be adversely affected by group velocity dispersion in the fiber. In particular, the various frequency components of the PM wave will arrive at the end of the fiber at slightly different times. This causes amplitude modulation of the received signal which in turn leads to a penalty in coherent transmission systems.[1,2]
56 citations
TL;DR: A bistable spatial light modulator is developed by utilizing optical bistability of ferroelectric liquid-crystal molecule to read out positive and negative images by changing the polarity of applied electric pulses.
Abstract: A bistable spatial light modulator is developed by utilizing optical bistability of ferroelectric liquid-crystal molecules. Both positive and negative images are read out by changing the polarity of applied electric pulses. A binary image is stored for more than 2 h, and gray-level operation is also possible during the gradual decay after writing.
56 citations
Patent•
10 Sep 1998
TL;DR: An integrated optical transmitter for use in an optical system has an optical head assembly with an optical beam generator and a lens assembly collecting the optical beam and generating therefrom a formed optical beam as discussed by the authors.
Abstract: An integrated optical transmitter for use in an optical system has an optical head assembly with an optical beam generator for providing an optical beam and a lens assembly collecting the optical beam and generating therefrom a formed optical beam. Interface optics receive the formed optical beam and provide optical coupling so as to minimize insertion loss to the optical beam. Also included is an optical modulator for receiving the optical beam from the interface optics and for providing a modulated optical beam in response to received modulation signals. The optical modulator is coupled to the interface optics to be in a fixed relationship therewith.
55 citations
TL;DR: Correlation experiments for the images used in the proposed setup indicate that nonlinear compression of the joint power spectrum may be necessary to produce good correlation performance and a peak-to-sidelobe ratio of larger than unity.
Abstract: Correlation experiments for the images used in the proposed setup indicate that nonlinear compression of the joint power spectrum may be necessary to produce good correlation performance and a peak-to-sidelobe ratio of larger than unity.
55 citations
TL;DR: In this paper, a few-layered broadband ReS2 saturable absorber (SA) was used to simulate the nonlinear optical properties of ReS 2 from the visible to mid-infrared spectral range, and the authors showed that the band gap can be reduced from 1.38 to 0.54 eV with the introduction of defects in a suitable range.
Abstract: Rhenium disulfide (ReS2), a member of group VII transition metal dichalcogenides (TMDs), has attracted increasing attention because of its unique distorted 1T structure and electronic and optical properties, which are much different from those of group VI TMDs (MoS2, WS2, MoSe2, WSe2, etc.). It has been proved that bulk ReS2 behaves as a stack of electronically and vibrationally decoupled monolayers, which offers remarkable possibilities to prepare a monolayer ReS2 facilely and offers a novel platform to study photonic properties of TMDs. However, due to the large and layer-independent bandgap, the nonlinear optical properties of ReS2 from the visible to mid-infrared spectral range have not yet been investigated. Here, the band structure of ReS2 with the introduction of defects is simulated by the ab initio method, and the results indicate that the bandgap can be reduced from 1.38 to 0.54 eV with the introduction of defects in a suitable range. In the experiment, using a bulk ReS2 with suitable defects as the raw material, a few-layered broadband ReS2 saturable absorber (SA) is prepared by the liquid phase exfoliation method. Using the as-prepared ReS2 SA, passively Q-switched solid-state lasers at wavelengths of 0.64, 1.064, and 1.991 μm are investigated systematically. Moreover, with cavity design, a femtosecond passively mode-locked laser at 1.06 μm is successfully realized based on the as-prepared ReS2 SA for the first time. The results present a promising alternative for a rare broadband optical modulator and indicate the potential of ReS2 in generating Q-switched and mode-locked pulsed lasers. It is further anticipated that this work may be helpful for the design of 2D optoelectronic devices with variable bandgaps.
55 citations