OSNR Requirements for Self-Homodyne Coherent Systems

The optical signal-to-noise ratio requirements for a self-homodyne (SH) coherent system are investigated theoretically and experimentally and compared to intradyne (ID) detection. The beneficial effect of bandpass filtering of the copropagating local oscillator is demonstrated and it is shown that the performance limit for SH and ID systems becomes equal as the filter bandwidth is made small.

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