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Opt Express. 2013 Jul 15;21(14):16683-9. doi: 10.1364/OE.21.016683.

FWM-based wavelength conversion of 40 Gbaud PSK signals in a silicon germanium waveguide.

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  • 1Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK.


We demonstrate four wave mixing (FWM) based wavelength conversion of 40 Gbaud differential phase shift keyed (DPSK) and quadrature phase shift keyed (QPSK) signals in a 2.5 cm long silicon germanium waveguide. For a 290 mW pump power, bit error ratio (BER) measurements show approximately a 2-dB power penalty in both cases of DPSK (measured at a BER of 10(-9)) and QPSK (at a BER of 10(-3)) signals that we examined.

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