Topic
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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TL;DR: In this article, a new all-optical switching device, which is constructed by connecting an erbium-doped fiber with two symmetrical long-period fiber gratings (EDF-LPFGs), is demonstrated.
Abstract: A new all-optical switching device, which is constructed by connecting an erbium-doped fiber with two symmetrical long-period fiber gratings (EDF-LPFGs), is demonstrated. The performance of EDF-LPFGs switching has been investigated based on cross-phase modulation under different parameters. The theoretical analysis shows that the threshold switching power is inverse proportional to the nonlinear coefficient of the erbium-doped fiber, and is proportional to the effective area of the erbium-doped fiber and absorption coefficient. Moreover, the switching power as low as 36 mW and high extinction ratio of 18 dB are obtained in our experiment. Good agreement between the theoretical and experimental results indicate that EDF-LPFGs switching is a new design in support of switching power reduction.
131 citations
TL;DR: A novel all-optical switching structure based on a photonic crystal directional coupler is proposed and analyzed and small length and low optical power consumption are the main features estimated.
Abstract: A novel all-optical switching structure based on a photonic crystal directional coupler is proposed and analyzed. Efficient optical switching is achieved by modifying the refractive index of the coupling region between the coupled waveguides by means of an optical control signal that is confined in the central region. Small length (around 1.1 mm) and low optical power consumption (over 1.5 W) are the main features estimated for this switching structure.
131 citations
TL;DR: The recent evolution of quantum-well self-electrooptic effect devices (SEEDs) for application in free-space optical switching and computing systems is reviewed and their implications for future developments are summarized.
Abstract: The recent evolution of quantum-well self-electrooptic effect devices (SEEDs) for application in free-space optical switching and computing systems is reviewed. Requirements of these systems have stimulated the development of devices usable in large systems of cascaded devices (the symmetric SEED), large two-dimensional arrays of these devices with improved physical performance, logically smarter extensions of these devices (logic-SEEDs), and devices integrating electronic transistors with quantum-well modulators and detectors for both reducing the required optical energies and increasing functionality. This progress and its implications for future developments are summarized. >
131 citations
TL;DR: In this paper, a multiply-coupled resonator side coupled to a pair of waveguides can switch an optical signal between two ports by means of absorption, and the absorptive mechanism is used to suppress the resonant power transfer, rather than to promote loss.
Abstract: A resonator side coupled to a pair of waveguides can switch an optical signal between two ports by means of absorption. The absorptive mechanism is used to suppress the resonant power transfer, rather than to promote loss. Thus, the input signal only suffers small attenuation, provided that the mode volumes of the resonators can be made small enough. Multiply-coupled resonators lead to improved crosstalk performance for both the ON and OFF switched states. The performance of such devices are analyzed analytically, and universal switching curves are derived.
131 citations
TL;DR: In this article, a novel frequency reconfigurable antenna design using photoconductive silicon elements as optical switches is presented, and a new geometry for coupling the light energy onto the silicon switches is demonstrated.
Abstract: This letter presents a novel frequency reconfigurable antenna design using photoconductive silicon elements as optical switches. By illuminating these silicon elements with light of suitable wavelength, their physical properties can be altered from that of a semiconductor to almost metal-like, which in turn alters the radiation properties of the antenna structure. Our work builds on similar work conducted in the past, but goes further by demonstrating a new geometry for coupling the light energy onto the silicon switches, thereby facilitating conformal integration of such reconfigurable antennas into next-generation wireless devices. In this letter, we first present a theoretical model characterizing the behavior of silicon substrate under light illumination. We then present experimental results on a stripline circuit employing a single silicon switch under light illumination and compare the theoretical model to experimental measurements. Finally, a novel frequency reconfigurable antenna design utilizing our new coupling geometry is designed, and its experimentally measured RF performance is compared to numerical simulations.
131 citations