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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18 May 2017
TL;DR: In this article, a light source system consisting of a light emitting device, a light splitting system, a first spatial light modulator, a second spatial modulator and a second spatio-temporal modulator is described.
Abstract: The embodiment of the invention discloses a light source system which comprises a light emitting device, a light splitting system, a first spatial light modulator and a second spatial light modulator. The light emitting device is used for emitting first light and second light in sequence. The light splitting system is used for splitting the first light from the light emitting device into first range wavelength light and second range wavelength light which are emitted along a first light channel and a second light channel respectively and further used for emitting at least some second light from the light emitting device along the first light channel. The first spatial light modulator is used for modulating the light emitted by the light splitting system along the first light channel. The second spatial light modulator is used for modulating at least some light emitted by the light splitting system along the second light channel. The light source system is high in light emitting efficiency and low in cost.
79 citations
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06 Oct 1997TL;DR: In this paper, a monolithic tapered rib waveguide is integrated into the guiding rib atop a cutoff mesa type semiconductor device such as an expanded mode optical modulator or and expanded mode laser.
Abstract: A monolithic tapered rib waveguide for transformation of the spot size of light between a semiconductor optical device and an optical fiber or from the fiber into the optical device. The tapered rib waveguide is integrated into the guiding rib atop a cutoff mesa type semiconductor device such as an expanded mode optical modulator or and expanded mode laser. The tapered rib acts to force the guided light down into the mesa structure of the semiconductor optical device instead of being bound to the interface between the bottom of the guiding rib and the top of the cutoff mesa. The single mode light leaving or entering the output face of the mesa structure then can couple to the optical fiber at coupling losses of 1.0 dB or less.
79 citations
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TL;DR: An overview of waveguide-coupled graphene optoelectronics is provided in this article, with a specific emphasis on the effect of disorder on the expected performance and energy consumption of graphene-based optical modulators.
Abstract: An overview of waveguide-coupled graphene optoelectronics is provided. A review of the optical properties of graphene is first provided and a motivation for waveguide-coupled graphene optoelectronics is given. This motivation is largely based upon the increased interaction length that can be achieved using such geometries. A derivation of the optical absorption for graphene interacting with a guided waveguide mode wave is provided. Device concepts for waveguide-coupled graphene optoelectronic devices, including optical modulators, photodetectors, and polarizers operating in the near- and mid-infrared regimes, are then described. This discussion provides a specific emphasis on the effect of disorder on the expected performance and energy consumption of graphene-based optical modulators. Finally, an outlook for future areas of exploration is given.
79 citations
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31 Oct 2001TL;DR: In this paper, an apparatus for optical coherence reflectometry is described, in which the light reflected from the sample is amplified without correspondingly amplifying the light in the reference light field.
Abstract: The present invention relates to an apparatus for optical coherence reflectometry, in particular for optical coherence tomography, wherein the apparatus for optical coherence reflectometry comprises a wavelength scanning laser source for providing a light signal, and splitting means for dividing said light signal into a sample light field and a reference light field, wherein the sample light field is directed to the sample being measured, and the light reflected from the sample is amplified without correspondingly amplifying the light reflected in the reference light field. Thereby, it is possible to direct substantially all light energy from the first reflected light field to the detectors, and to obtain fully the utilisation of the amplification of the first reflected light field. The optical amplifier inserted in the sample reflected light field is different from the source so that the effect of the light source may be regulated independent of the degree of amplification. In particular when using the apparatus in coherent optical FMCW reflectometry certain safety regulations for the power density towards the sample has to be observed to reduce the risk of damages to the sample under examination, such as biological tissue. The apparatus may be used for a variety of purposes, in particular for obtaining optical biopsies of transparent as well as non-transparent tissues.
79 citations
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TL;DR: In this paper, the latest experimental and theoretical demonstrations of graphene optical modulators (GOMs) with different structures and functions are reviewed Particularly, the principles of electrooptical and all-optical modulators are illustrated Additionally, the limitation of GOMs and possible methods to improve performance and practicability are discussed.
Abstract: Optical modulators (OMs) are a key device in modern optical systems Due to its unique optical properties, graphene has been recently utilized in the fabrication of optical modulators, which promise high performance such as broadband response, high modulation speed, and high modulation depth In this paper, the latest experimental and theoretical demonstrations of graphene optical modulators (GOMs) with different structures and functions are reviewed Particularly, the principles of electro-optical and all-optical modulators are illustrated Additionally, the limitation of GOMs and possible methods to improve performance and practicability are discussed At last, graphene terahertz modulators (GTMs) are introduced
79 citations