Abstract
We report the first experimental demonstration of simultaneous
multi-impairment monitoring of phase-modulated 40 Gbit/s nonreturn to zero
differential phase-shift keying (NRZ-DPSK) and 640 Gbit/s return-to-zero
(RZ)-DPSK optical signals. Our approach exploits the femtosecond response
time of the Kerr nonlinearity in a centimeter-scale, highly nonlinear,
dispersion engineered chalcogenide planar waveguide to perform THz bandwidth
RF spectrum analysis. The features observed on the radio-frequency (RF)
spectrum are directly utilized to perform simultaneous group velocity
dispersion and in-band optical signal-to-noise ratio (SNR) monitoring. We
also numerically investigate the measurement accuracy of this monitoring
technique, highlighting the advantages, and suitability of the chalcogenide
rib waveguide.
© 2010 IEEE
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