Selective frequency switching system and a reconfigurable...

Optical communications – Multiplex – Optical switching

Reexamination Certificate

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Reexamination Certificate

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07324751

ABSTRACT:
The invention relates to a reconfigurable optical switching system for selectively coupling one or more frequencies of first and second input wavelength division multiplex signals (WDM1, WDM2) consisting of N channels to first and second output ports (O1, O2). The invention also relates to a variable and reconfigurable optical delay circuit comprising said optical switching system associated with an optical delay loop. The input frequency division multiplex optical spectra (WDM1, WDM2) are therefore divided by a first demultiplexer (Demux) to a plurality of interleaved stages of optical switches (D, C, A and B) which selectively feed a plurality of input ports (Mi) of a multiplexer (Mux), which then uses its routing properties to implement in particular the complex reconfigurable multiple 2×2 frequency switching function.

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patent: 7058302 (2006-06-01), Khalfallah et al.
Jeyashankher Ramamirtham and Jonathan Turner Design of Wavlength Converting Switches for Optical Burst Switching Washington University of St. Louis—School of Engineering & Applied Science Aug. 7, 2001.
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A. Misawa et al, “WDM Knockout Switch with Multi-Output-Port Wavelength-Channel Selectors”, Journal of Lightwave Technology, IEEE, New York—vol. 16, No. 12, Dec. 1998 pp. 2212-2219, XP000833965.
A. Misawa et al, “Two-output-port fast tunable filter witih low loss and low loss variation for 32 wavelength channels” Electronics Letters, IEE Stevenage< GB, vol. 353, No. 8, Apr. 15, 1999, pp. 657-658, XP006012028.

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