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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.
Optical carrier extraction from carrier-less BPSK signals is demonstrated, where homodyne detection, modulation stripping, and injection locking of laser diode are performed in a feedback loop. Clear eye opening is observed in the homodyne-detected signal.
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