Abstract
We propose and characterize a simple, integrable, and wavelength-preserving scheme able to groom a 40Gbps (D)QPSK signal with a 20Gbps OOK one into a 20Gbaud (60Gbps) 8-APSK signal. The proposed all-optical scheme is based on the second-order nonlinear signal-depletion effect in a single periodically poled lithium niobate (PPLN) waveguide. Performance of the device, characterized by means of BER measurements, attests error-free operation and a power penalty below 4.1dB.
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