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We show that a transmitter consisting of a light-emitting diode (LED) followed by a semiconductor amplifier can be used to transmit data in a subcarrier multiple access system for fiber-in-the-loop. Optical beat interference penalties, which have been observed when conventional laser transmitters are used, were eliminated with the amplified LED. Penalty-free system operation is observed when a signal is transmitted with 17 dB less optical power than each of two interfering transmitters.
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Feldman et al. (1996) studied this question.
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