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Optical modulator

About: Optical modulator is a research topic. Over the lifetime, 14068 publications have been published within this topic receiving 196932 citations.


Papers
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Journal ArticleDOI
TL;DR: A high-power laser system with a high-quality near-field beam by using a liquid-crystal spatial light modulator (SLM) is demonstrated and an efficient spatial beam shaping algorithm is discussed which can improve the output nearfield beam quality effectively.
Abstract: We demonstrate a high-power laser system with a high-quality near-field beam by using a liquid-crystal spatial light modulator (SLM). An efficient spatial beam shaping algorithm is discussed which can improve the output nearfield beam quality effectively. Both small-signal and large-signal amplification situation of the laser are considered in the beam shaping algorithm. The experimental results show that the near field fluence modulation of output is improved from 1.99:1 to 1.26:1 by using the liquid-crystal SLM. Obvious uniform spatial fluence distribution and near-field beam quality improvement are observed.

71 citations

Journal ArticleDOI
Tatemi Ido1, Hirohisa Sano1, David J. Moss1, Shigehisa Tanaka1, A. Takai1 
TL;DR: In this paper, a tensile InGaAs/InAlAs MQW electroabsorption modulator was proposed for multigigabit long-haul fiber transmission systems.
Abstract: We demonstrate the improved modulation properties of a new strained InGaAs/InAlAs MQW electro-absorption modulator. This tensile strained MQW modulator shows low driving voltage (V/sub 15 dB/=1.2 V), large modulation bandwidth (f/sub 3 dB/>20 GHz), and a 10 Gbit/s eye pattern with a clear eye opening and high extinction ratio. The effective /spl alpha/ parameter determined from waveform deterioration is 0.6, which is low enough for multigigabit long-haul fiber transmission systems. >

71 citations

Journal ArticleDOI
TL;DR: In this paper, it was shown that the maximum modulation ratio in Fabry-Perot reflective electroabsorption modulators for a given insertion loss is solely a function of the ratio of the maximum to minimum absorption.
Abstract: We show theoretically that the maximum modulation ratio in Fabry–Perot reflective electroabsorption modulators for a given insertion loss is solely a function of the ratio of the maximum to minimum absorption. We increase this ratio by using thinner quantum wells than are conventionally used and obtain significantly improved performance. We obtain an insertion loss of 1.2 dB and a modulation ratio of 7.5 with a 5 V operating bias.

71 citations

Patent
28 Jun 1991
TL;DR: In this article, a structure for optical interconnection is disclosed along with methods of manufacture and operation, which consists of optical fibers connected to an array of microlenses, either through integrated waveguides or not, that direct light onto a mirror formed in a substrate, which reflects light to a spatial light modulator.
Abstract: A structure for optical interconnection is disclosed along with methods of manufacture and operation. In one embodiment, the structure consists of optical fibers connected to an array of microlenses, either through integrated waveguides or not, that direct light onto a mirror formed in a substrate, which reflects light to a spatial light modulator. The spatial light modulator in turn reflects the light back to another mirror, which reflects the light through another microlens array, through integrated waveguides or not, and out another optical fiber. The structure is manufactured by forming the mirrors out of the substrate, forming waveguides if desired, forming troughs for the fibers and the microlenses, attaching external pieces such as the fibers, the lenses, and the spatial light modulator package, and packaging the device to maintain alignment.

71 citations

Patent
12 Jan 2005
TL;DR: In this paper, the frequency of a selected spectral component can be tuned by either tuning the optical beam that is modulated by the optical modulator or a filter that is used to filter modulated optical beam.
Abstract: RF and microwave devices and techniques are disclosed for processing RF and microwave signals by using (1) photonic or optical components and (2) RF and microwave components. In some implementations, a part of the processing is performed in the RF and microwave domain such as applying a microwave or RF input signal to control an optical modulator, and another part of the processing is performed in the optical domain such as optical filtering of the modulated optical beam to select desired microwave or RF spectral components. The frequency of a selected spectral component can be tuned by either tuning the frequency of the optical beam that is modulated by the optical modulator or a filter that is used to filter modulated optical beam.

71 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202342
2022154
2021166
2020289
2019311
2018325