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Optical switch

About: Optical switch is a research topic. Over the lifetime, 28538 publications have been published within this topic receiving 351176 citations.


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Patent
14 Oct 1999
TL;DR: In this paper, the use of a rigid beam and the configuration eliminates the torsional and bending forces of the beam which can reduce reliability, which improves the sensitivity of the switch and also allows it to be used in RF switching applications.
Abstract: An RF switch formed as a micro electro-mechanical switch (MEMS) which can be configured in an array forming a micro electro-mechanical switch array (MEMSA). The MEMS is formed on a substrate. A pin, pivotally carried by the substrate defines a pivot point. A rigid beam or transmission line is generally centrally disposed on the pin forming a teeter-totter configuration. The use of a rigid beam and the configuration eliminates the torsional and bending forces of the beam which can reduce reliability. The switch is adapted to be monolithically integrated with other monolithic microwave integrated circuits (MMIC) for example from HBTs and HEMTs, by separating such MMICs from the switch by way of a suitable polymer layer, such as polyimide, enabling the switch to be monolithically integrated with other circuitry. In order to reduce insertion losses, the beam is formed from all metal, which improves the sensitivity of the switch and also allows the switch to be used in RF switching applications. By forming the beam from all metal, the switch will have lower insertion loss than other switches which use SiO2 or mix metal contacts.

98 citations

Patent
10 Sep 1999
TL;DR: In this paper, a method for preparing an improved hybrid optical integrated circuit which is capable of accommodating optical waveguides, optical devices, such as light emitting devices and light receiving devices, and optical fibers in an effective manner is presented.
Abstract: The present invention relates to an optical integrated circuit; and, more particularly, to a method for preparing an improved hybrid optical integrated circuit which is capable of accommodating optical waveguides, optical devices, such as light emitting devices and light receiving devices, and optical fibers in an effective manner. The present invention has the advantages of minimizing horizontal misalignment error between the SOI waveguide rib area, the V-groove etch window and the alignment marks, decreasing the manufacturing cost by passively aligning the waveguides, the optical devices and the optical fibers on a single substrate. Also, the present invention has an effect of reducing fresnel reflection loss by providing the LPCVD silicon nitride layer capable of being used as an anti-reflection coating layer at both ends of the waveguide.

98 citations

Patent
08 Oct 2002
TL;DR: In this paper, a photonic integrated circuit (PIC) in the form of an optical receiver PIC or RxPIC is disclosed in conjunction with an optical transmitter PIC in an optical transport network.
Abstract: A photonic integrated circuits (PICs), also referred to as opto-electronic integrated circuits (OEICs), and more particularly to a PIC in the form of an optical receiver PIC or RxPIC for use in an optical transport networks. Also, an optical transmitter PIC (TxPIC) is also disclosed in conjunction with an RxPIC in an optical transport network. The chip is cast from an InP wafer and is made from Group III-V elemental materials in the InGaAsP/InP regime with fabrication accomplished through selective metalorganic vapor phase epitaxy (MOVPE) or also known as metalorganic chemical vapor deposition (MOCVD). Integrated on the chip, starting at the input end which is coupled to receive multiplexed optical data signals from an optical transport network is an optical amplifier, an optical demultiplexer, and a plurality of on-chip photodiodes (PDs) each to receive a demultiplexed data signal from the AWG DEMUX for optical-to-electrical signal conversion. The optical input amplifier may be an on-chip gain clamped semiconductor optical amplifier (GC-SOA) or an off-chip fiber amplifier. The optical input amplifier may be optional if the channel signal demultiplexer provides for minimal insertion loss which is optimum with a properly designed arrayed waveguide grating (AWG) demultiplexer.

98 citations

Journal ArticleDOI
TL;DR: In this article, a self-induced nonlinear polarization rotation in a semiconductor optical amplifier (SOA) is used to achieve all-optical logic for optical buffering at a bit rate of 10 Gb/s.
Abstract: We demonstrate novel optical signal processing functions based on self-induced nonlinear polarization rotation in a semiconductor optical amplifier (SOA). Numerical and experimental results are presented, which demonstrate that a nonlinear polarization switch can be employed to achieve all-optical logic. We demonstrate an all-optical header processing system, an all-optical seed pulse generator for packet synchronization, and an all-optical arbiter that can be employed for optical buffering at a bit rate of 10 Gb/s. Experimental results indicate that optical signal processing functions based on self-polarization rotation have a higher extinction ratio and a lower power operation compared with similar functions based on self-phase modulation.

97 citations

Journal ArticleDOI
TL;DR: In this paper, new optical switching and memory elements utilizing the spectral change of conducting polymers by electro-chemical doping and undoping are proposed, which can be used for memory elements.
Abstract: New optical switching and memory elements utilizing the spectral change of conducting polymers by electro-chemical doping and undoping are proposed.

97 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202395
2022282
2021383
2020557
2019624
2018665