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Optimization of SOA-based Sagnac-interferometer switches for demultiplexing to 10 and 40 Gb/s

: Diez, S.; Hilliger, E.; Korh, M.; Schmidt, C.; Schubert, C.; Weber, H.G.; Occhi, L.; Schares, L.; Guekos, G.; Oxenlowew, L.K.


Optics communications 189 (2001), No.4-6, pp.241-9
ISSN: 0030-4018
Journal Article
Fraunhofer HHI ()
demultiplexing; demultiplexing equipment; light interferometers; optical switches; optimisation; semiconductor optical amplifiers; time division multiplexing; soa-based sagnac-interferometer switches; sagnac-interferometer switches; performance; semiconductor optical amplifier; sagnac-interferometer switch; time division demultiplexer; dynamic switching window measurements; time resolution; temporal width; contrast; switching windows; switch operation; control pulse rate; all-optical demultiplexing; base rate; switching contrast; soa-based interferometric demultiplexers; base rates; all-optical demultiplexers; electronic signal processing; 10 GHz; 1 ps; 500 mum; 100 mum; 1500 mum; 10 Gbit/s; 40 Gbit/s; 40 GHz

We investigate the performance of a semiconductor optical amplifier (SOA) based Sagnac-interferometer switch in its application as time division demultiplexer. By performing dynamic switching window measurements with a time resolution of about 1 ps, the temporal width and the contrast of the switching windows are investigated for SOA lengths of 500, 1000 and 1500 mu m. Operating the switch with a control pulse rate of 10 GHz (corresponding to all-optical demultiplexing to 10 Gb/s) the shortest switching windows, still retaining high contrast, are achieved with short SOAs. By increasing the control pulse rate to 40 GHz, the case of an SOA-based all-optical demultiplexer with a base rate of 40 Gb/s is investigated. Though the switching contrast deteriorates for the 40 GHz control pulse rate, the obtainable contrast is still up to 19 dB. This finding encourages the feasibility of SOA-based interferometric demultiplexers with base rates of 40 Gb/s. In particular, this feature is crucial to future all-optical demultiplexers as the base rate of electronic signal processing is currently evolving to 40 Gb/s.