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Opt Express. 2012 Nov 19;20(24):26110-6. doi: 10.1364/OE.20.026110.

Ultrafast wavelength conversion via cross-phase modulation in hydrogenated amorphous silicon optical fibers.

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Optoelectronics Research Centre, University of Southampton, Southampton, UK.


We present a characterization of the spectral modulation and wavelength shifting induced via cross-phase modulation (XPM) in a hydrogenated amorphous silicon (a-Si:H) core optical fiber. Pump-probe experiments using picosecond and femtosecond signal pulses are shown to be in good agreement with numerical simulations of the coupled nonlinear propagation equations. The large 10nm red-shifts obtained with the femtosecond probe pulses are attributed to the high Kerr nonlinearity of the a-Si:H material. Extinction ratios as high as 12 dB are measured for the conversion process at telecommunications wavelengths, indicating the potential for high-speed nonlinear optical control in a-Si:H fibers and waveguides.

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