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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26 Mar 2000
TL;DR: It is theoretically possible for a PPS to emulate a FCFS (first come first served) output-queued packet-switch if each layer operates at a rate of approximately 2R/k, analogous to Clos theorem for a three-stage circuit switch to be strictly non-blocking.
Abstract: Our work is motivated by the desire to build a very high speed packet switch with extremely high line-rates. In this paper, we consider building a packet switch from multiple, lower speed packet switches operating independently and in parallel. In particular, we consider a (perhaps obvious) parallel packet switch (PPS) architecture in which arriving traffic is demultiplexed over k identical, lower speed packet-switches, switched to the correct output port, then recombined (multiplexed) before departing from the system. Essentially, the packet switch performs packet-by-packet load-balancing, or "inverse-multiplexing" over multiple independent packet switches. Each lower-speed packet switch, operates at a fraction of the line-rate, R; for example, if each packet switch operates at rate R/k no memory buffers are required to operate at the full line-rate of the system. Ideally, a PPS would share the benefits of an output-queued switch; i.e. the delay of individual packets could be precisely controlled, allowing the provision of guaranteed qualities of service. In this paper, we ask the question: Is it possible for a PPS to precisely emulate the behavior of an output-queued packet-switch with the same capacity and with the same number of ports? The main result of this paper is that it is theoretically possible for a PPS to emulate a FCFS (first come first served) output-queued packet-switch if each layer operates at a rate of approximately 2R/k. This simple result is analogous to Clos theorem for a three-stage circuit switch to be strictly non-blocking. We further show that the PPS can emulate any QoS queueing discipline if each layer operates at a rate of approximately 3R/k.
116 citations
Patent•
28 Sep 1993TL;DR: In this paper, an optical device is presented which is useful for optical signal transmission and switching systems by multiplexing and demultiplexing optical signals in looped optical paths, consisting of a plurality of individual loop-back optical paths.
Abstract: An optical device is presented which is useful for optical signal transmission and switching systems by multiplexing and demultiplexing optical signals in looped optical paths, consisting of a plurality of individual loop-back optical paths. The device is essentially a multi/demultiplexer having an arrayed waveguide grating disposed between a plurality of input sections and output sections which are joined by the plurality of individual loop-back optical paths. Because the modulated signals are looped back into the same optical paths using the same devices, problems of mismatching performance introduced by using different optical devices are avoided. The device processes individual optical signals of different wavelengths, minimizes splitting losses, and reduces noise components by producing narrow bandpass signals of high signal to noise ratio. Optical signal splitting and insertion, delay line memory and delay equalization circuits can all be handled by the same circuit configuration. The device is simple in construction, reliable in performance and economical in production.
116 citations
TL;DR: An InGaAsP-InP optical switch geometry based on electrical control of waveguide-resonator coupling is demonstrated, which enables a substantial reduction of the switching power, to a value of 26 mW in comparison with 40 mW for a conventional Mach-Zehnder interferometer switch.
Abstract: An InGaAsP-InP optical switch geometry based on electrical control of waveguide-resonator coupling is demonstrated. Thermooptic tuning of a Mach-Zehnder interferometer integrated with a racetrack resonator is shown to result in switching with ON-OFF contrast up to 18.5 dB. The optical characteristics of this unique design enable a substantial reduction of the switching power, to a value of 26 mW in comparison with 40 mW for a conventional Mach-Zehnder interferometer switch. Modulation response measurements reveal a 3 dB bandwidth of 400 kHz and a rise time of 1.8 µs, comparing favorably with current state-of-the-art thermooptic switches.
116 citations
TL;DR: In this article, the authors used photoconductivity produced by picosecond optical pulses in silicon to switch electrical signals as large as 15 kV and used it to drive a traveling wave Pockel's cell for efficient optical switching with a measured rise time of approximately 25 psec.
Abstract: Photoconductivity produced by picosecond optical pulses in silicon has been used to switch electrical signals as large as 15 kV The signals have been used to drive a traveling‐wave Pockel’s cell for efficient optical switching with a measured rise time of approximately 25 psec
115 citations
TL;DR: A TOAD-based tree architecture is proposed, a new and alternative scheme, for integrated all-optical logic and arithmetic operations in the optical interconnecting network.
Abstract: Interferometric devices have drawn a great interest in all-optical signal processing for their high-speed photonic activity. The nonlinear optical loop mirror provides a major support to optical switching based all-optical logic and algebraic operations. The gate based on the terahertz optical asymmetric demultiplexer (TOAD) has added new momentum in this field. Optical tree architecture (OTA) plays a significant role in the optical interconnecting network. We have tried to exploit the advantages of both OTA- and TOAD-based switches. We have proposed a TOAD-based tree architecture, a new and alternative scheme, for integrated all-optical logic and arithmetic operations.
115 citations