Local-oscillator excess-noise suppression for homodyne and heterodyne detection

Opt Lett. 1983 Aug 1;8(8):419-21. doi: 10.1364/ol.8.000419.

Abstract

Semiclassical calculations of the signal-to-noise density ratio for a homodyne/heterodyne receiver utilizing two detectors are made. These calculations show that excess intensity noise in the local oscillator can be canceled and need not degrade the performance of the receiver. An experimental demonstration of excess-noise cancellation is reported.