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.
|Pages (from-to)||19886-19894 |
|State||Published - 2011|
This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/josab/home.cfm. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.