We have successfully demonstrated all-optical wavelength
conversion of a 640-Gbit/s line-rate return-to-zero differential phase-shift
keying (RZ-DPSK) signal based on low-power four wave mixing (FWM) in
a silicon photonic chip with a switching energy of only ~110 fJ/bit. The
waveguide dispersion of the silicon nanowire is nano-engineered to
optimize phase matching for FWM and the switching power used for the
signal processing is low enough to reduce nonlinear absorption from twophoton-
absorption (TPA). These results demonstrate that high-speed
wavelength conversion is achievable in silicon chips with high data integrity
and indicate that high-speed operation can be obtained at moderate power
levels where nonlinear absorption due to TPA and free-carrier absorption
(FCA) is not detrimental. This demonstration can potentially enable highspeed
optical networks on a silicon photonic chip.
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