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Comparison of interferometric all-optical switches for demultiplexing applications in high-speed OTDM systems

: Schubert, C.; Berger, J.; Diez, S.; Ehrke, H.J.; Ludwig, R.; Feiste, U.; Schmidt, C.; Weber, H.G.; Toptchiyski, G.; Randel, S.; Petermann, K.


Journal of Lightwave Technology 20 (2002), No.4, pp.618-624
ISSN: 0733-8724
Journal Article
Fraunhofer HHI ()
demultiplexing; high-speed optical techniques; mach-zehnder interferometers; mirrors; optical modulation; optical switches; semiconductor optical amplifiers; time division multiplexing; interferometric all-optical switches; demultiplexing applications; high-speed otdm systems; cross-phase modulation; semiconductor laser amplifier; loop mirror; slalom switch; ultrafast nonlinear interferometer switch; switching windows; integrated contrast ratio; demultiplexer; optical time division multiplexing; otdm; data rates; 40 Gbit/s; 80 Gbit/s; 160 Gbit/s

We have investigated three interferometric all-optical switches based on cross-phase modulation (XPM) in semiconductor optical amplifiers (SOAs), the semiconductor laser amplifier in a loop mirror (SLALOM) switch, the Mach-Zehnder interferometer (MZI) switch, and the ultrafast nonlinear interferometer (UNI) switch. Switching windows with different widths are measured under similar conditions for all three switching configurations. We introduce the integrated contrast ratio (ICR) as a measure to evaluate the performance of a switch from switching windows. Using the ICR, the switches are compared and their application is discussed as demultiplexer in optical time division multiplexing (OTDM) systems for data rates of 40, 80, and 160 Gb/s.