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 two-cascaded semiconductor optical amplifiers (SOAs) in a counter-propagating feedback configuration were used for all-optical logic NOR gates.
Abstract: The authors present a novel all-optical logic NOR gate using two-cascaded semiconductor optical. amplifiers (SOAs) in a counterpropagating feedback configuration. This configuration accentuates the gain nonlinearity due to the mutual gain modulation of the two SOAs. The all-optical NOR gate feasibility has been demonstrated delivering an extinction ratio higher than 12 dB over a wide range of wavelength.
79 citations
TL;DR: In this paper, the authors demonstrate switching in magnetic tunnel junctions (MTJs), the building blocks of spintronic technology, with 0.4-ps infrared laser pulses, at 100 times the record speed for MTJ switching.
Abstract: Injecting charge or spin current can switch the magnetization in a spintronic device without an applied magnetic field, at a speed limited by spin precession. Optical switching can beat this limit, but has been achieved only in single magnetic layers, not full devices. The authors demonstrate switching in magnetic tunnel junctions (MTJs), the building blocks of spintronic technology, with 0.4-ps infrared laser pulses. Their junctions use Gd-Fe-Co alloy, which after being heated by a pulse spontaneously relaxes to the opposite magnetic state---at 100 times the record speed for MTJ switching.
79 citations
Patent•
11 Sep 1998TL;DR: In this paper, a waveguide substrate having at least two waveguides that intersect at a trench such that optical coupling is dependent upon the presence or absence of an index-matching fluid at the intersection of the waveguide with the trench is provided.
Abstract: A method of fabricating a switching element or a matrix of switching elements includes providing a waveguide substrate having at least two waveguides that intersect at a trench such that optical coupling between the waveguides is dependent upon the presence or absence of an index-matching fluid at the intersection of the waveguides with the trench. Fluid is supplied to the trench via a fluid fill-hole that extends through a heater substrate in a direction that is generally perpendicular to a substrate surface on which at least one heater is fabricated. In the preferred embodiment, the fluid fill-hole is formed in a step of inductively coupled plasma (ICP) reactive ion etching (RIE). The waveguide substrate having at least two waveguides and the heater substrate having the heaters and the fill-hole are bonded together after the substrates are aligned such that the trench is in fluid communication with at least one fluid fill-hole and is in thermal communication with at least one heater. Optical fibers are then coupled to the waveguides. Preferably, a structurally weakened edge portion is formed during the ICP RIE step so that the edge portion can be removed after the two substrates are bonded, allowing uninhibited access of the optical fibers to the waveguides.
79 citations
Patent•
14 Apr 2003
TL;DR: In this paper, an exemplary method and optical network (10) that provides optical network restoration using refreshed state tables (56, 64) for recovering from a failure in an optical network using refreshed switch state tables is presented.
Abstract: An exemplary method and optical network (10) that provide optical network restoration using refreshed state tables (56, 64) for recovering from a failure in an optical network (10) using refreshed switch state tables (56, 64) includes generating and storing connection information in switch state tables of associated optical switches (50) that define optical link connections to be made in the event of a failure, monitoring whether a failure has occurred, and refreshing the switch state tables (56, 64) by continuing to generate and store connection information in the plurality of switch state tables that are associated with the plurality of optical switches (50) of the optical network (10) until the failure in the optical network (10) is detected. Optical switching is automatically performed in the optical switches based on the lookup table connection information in the switch state tables that are associated with the optical switches. The exemplary method may then include determining whether any of the telecommunications traffic in the optical links of optical network was not restored due to the optical switching that was automatically performed.
79 citations
TL;DR: In this paper, a cascaded second-order nonlinear switch based on a Mach-Zehnder interferometer with quasi-phase matching has been proposed, which can switch with power around 1.3 W in a length of approximately 1 cm.
Abstract: A new, ultrafast, low loss, all-optical switch based on the cascaded second-order nonlinearity is proposed. The device is based on an integrated Mach-Zehnder interferometer where quasi-phase matching produces a nonlinear phase shift with a different sign in each arm of the interferometer. A full treatment of the nonlinear phase shift indicates that the proposed device, if fabricated in AlGaAs, could switch with powers around 1.3 W in a length of approximately 1 cm. >
79 citations