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Original practical and theoretical results are presented for heterodyne detection of optical digital pulse-position modulation ( lambda =1.523 mu m) employing suboptimal filtering. The measured sensitivity was -62.7 dBm when operating with a 20 ns slot width and 16 data-pulse positions. This represents an improvement of 16.8 dB over an equivalent suboptimal direct detection digital pulse-position modulation system. With -18 dBm of local oscillator power, the sensitivity was within 8.6 dB of the short-noise limit.
Date of Publication: 12 March 1992