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Optical Switching and Networking. 01/2011; 8:86-92.
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ABSTRACT: We demonstrate the design and experimental implementation of an electro-optic control system that is used to detect the arrival of packets at the optical switch input, process the headers of the packets, and control switching according to the header content for both fixed and variable length packets. We also demonstrate the flexibility of the electro-optic crosspoint switch for implementation in a photonic packet switching (PPS) network. Furthermore, contention resolution is demonstrated in the electro-optic crosspoint switch by detecting packets at the input ports and controlling the switch operation accordingly. By incorporating this control system into the crosspoint switch it is possible to route contending packets to a re-circulating fiber delay line and control the switch output in a flexible manner for any type of traffic depending on the applied switching algorithm. The experiments are carried out with 155 Mbit/s headers and 10 Gbit/s payloads transmitted on a single wavelength with a guard time of 12.8 ns between header and payload. PPS with bit error rate (BER) less than 10<sup>-9</sup> is demonstrated. Error free contention resolution is shown with the main signal degradation being from the switch cell attenuation and amplifier ASE that can be alleviated by eliminating fiber-to-fiber transmission loss in the crosspoint.
AFRICON 2007; 10/2007
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ABSTRACT: A novel optical serial multicast mode scheme using an active vertical coupler optical crosspoint switch matrix has been successfully demonstrated. A fibre delay line has been employed to recirculate optical packets, providing one serial output packet for each recirculation. A minimum Q-factor of 5.68 dB and an optical signal-to-noise-ratio penalty of <2.3 dB are found after nine recirculations
Electronics Letters 02/2007; · 0.96 Impact Factor
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ABSTRACT: Novel optical hybrid multicast mode operation has been successfully demonstrated using an active vertical coupler optical crosspoint switch matrix. A fibre delay line has been used to recirculate optical packages, and the OXS matrix provides three parallel output copies in each recirculation or time slot. Nine output copies have been obtained in only three time slots and shorter delay lines, which exceeds the scale of parallel multicast mode operation and has shorter differential delay than serial multicast mode operation.
Electronics Letters 02/2007; · 0.96 Impact Factor
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ABSTRACT: This paper presents the experimental results of the switching performances of the fast reconfigurable optical crosspoint switch (OXS) matrix. This paper demonstrates unicast optical packet switching for a 10-Gb/s payload at various modulation formats and a 155-Mb/s nonreturn-to-zero label. Reconfigurable time as fast as 2 ns is achieved because of the optimized control circuit and device fabrication. The power and wavelength dependence for the payload and the capability of multihop operation are investigated as well. The functionalities of the OXS acting as an optical switch and an optical buffer are demonstrated in the optical network node experiment. Very good switching property is obtained for the OXS, which clearly validates OXS as a potential technique for future high-speed Internet-protocol-over-wavelength-division-multiplexing networks
Journal of Lightwave Technology 11/2006; · 2.78 Impact Factor
