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Opt Express. 2011 Apr 25;19(9):8320-6. doi: 10.1364/OE.19.008320.

Novel real-time homodyne coherent receiver using a feed-forward based carrier extraction scheme for phase modulated signals.

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Department of Physics and Tyndall National Institute, University College Cork, Ireland.


We report a novel real-time homodyne coherent receiver based on a DPSK optical-electrical-optical (OEO) regenerator used to extract a carrier from carrier-less phase modulated signals based on feed-forward based modulation stripping. The performance of this non-DSP based coherent receiver was evaluated for 10.66 Gbit/s BPSK signals. Self-homodyne coherent detection and homodyne detection with an injection-locked local oscillator laser was demonstrated. The performance was evaluated by measuring the electrical signal-to-noise (SNR) and recording the eye diagrams. Using injection-locking for the LO improves the performance and enables homodyne detection with optical injection-locking to operate with carrier-less BPSK signals without the need for polarization multiplexed pilot-tones.

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