All-Optical Switching of Picosecond Pulses by Four-Wave Mixing in a Semiconductor Optical Amplifier
نویسنده
چکیده
High-speed all-optical switching is demonstrated by four-wave mixing (FWM) of picosecond pulses using semiconductor optical amplifiers (SOA). A light source for measurement and switching in the 1.5 μm region is produced using a normal group velocity dispersion fiber and optical parametric oscillator. The output supercontinuum (SC) optical pulses, with a spectral width of approximately 300 nm, are then compressed to 60 fs by propagation in an anomalous group velocity dispersion fiber to compensate for the up-chirp of the SC pulses. The SC output is accurately reproduced by a nonlinear Schrödinger equation analysis. The gain dynamics of a multiple-quantum-well SOA with wide gain bandwidth, an essential device for the realization of ultrafast FWM, were measured by a two-color pump-probe technique using 100 fs optical pulses. The basic characteristics of all-optical demultiplexing based on FWM in SOAs are analyzed numerically, and ultrafast all-optical switching is demonstrated experimentally using two pump pulses with different wavelengths and timings to achieve 1×2 switching. Cross-correlation measurements of the FWM signals reveal that high-speed switching for wavelength routing in optical time-division multiplexing networks can be achieved using this scheme.
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