Abstract
This paper describes an optical-frequency pulse-position-modulation experiment using a GaAs luminescent diode as the source and either a pin or an avalanche photodiode as the detector. The experimental system transmits an audio band from 300 Hz to 3.4 kHz at an 8-kb/s repetition rate. Timing synchronization between the transmitter and receiver has been accomplished by two methods: by transmitting a separate clock signal and by recovering the timing from the ppm signal itself. Data show, with each scheme, peak-signal-to-rms-noise ratios of 70 dB can be achieved with the required average optical power at the receiver being − 73 dBm with a pin detector and − 88 dBm with an avalanche detector.
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