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By launching two phase-correlated continuous-wave pumps via injection-locking, a broadband optical comb generated through higher-order parametric interactions shows unchanged linewidth of each comb line over 100-nm, compared to otherwise quadratically-scaled linewidth.

We demonstrate a new linearization approach for analog parametric sampling gates. The method utilizes a higher-order parametric mixing product to suppress the quadratic distortion present in the output of a high-power-efficiency parametric mixer.

Wavelength shifting of a 21.4-Gbaud 64-QAM signal is achieved using Bragg scattering with dither-free pumping in a longitudinally stressed highly nonlinear silica fiber. Three wavelengths over a 10-nm tuning range centered on a 24-nm shift are demonstrated with a penalty of less than 2 dB at a BER of 10-3.