Abstract
Pulse Position Modulation (PPM) is particularly attractive for eommunications at optical frequencies because the optical energy source can be operated at a low, message-independent duty cycle to extend the lifetime of the device, and the technique affords high noise Immunity. By employing a short pulse width and thereby expanding the bandwidth of the transmitted signal, the effects of signal shot noise, detector leakage noise and amplifier thermal noise are reduced.1
© 1975 Optical Society of America
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