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Nonlinearity mitigation by mid-link spectral inversion (SI) in WDM systems is analyzed. It is shown that better cross-phase modulation (XPM) mitigation is achieved when the SI is applied to each channel but channel wavelengths are not exchanged in a dispersion-managed system. Such SI needs channel-by-channel SI that is suitably performed by electro-optic phase conjugators.
Optical carrier recovery from carrier-suppresse+P97d QPSK signals is demonstrated. The scheme consists of homodyne detection, modulation stripping by an electro-optic modulator, and injection locking of a laser diode, which are carried out in a feedback loop.
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