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Traveling Type Optical Cell Buffer with Small Variation of Output Cell Level
IEICE TRANSACTIONS on Electronics
Publication Date: 1999/02/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Issue on Photonics in Switching: Systems and Devices)
Category: Packet and ATM Switching
optical buffer, fiber delay line, optical gate, optical switch,
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An optical cell buffer (OCB) for use in photonic ATM switch, is needed in order to resolve contention between optical cells. A 320-Gb/s-throughput switch system with 32 wavelength channels requires a buffer size of 13 and a wavelength bandwidth of 25 nm. We developed an optical cell buffer with a four-nested-taps configuration and fabricated it with electroabsorption gates and gain clamped optical amplifiers. The output level variation, which determines the stability of operating condition, is less than 2.4 dB under typical conditions and the insertion loss variation is suppressed to within 5 dB. This OCB can be used in a 320-Gb/s photonic ATM switch.