Abstract
Erbium-doped fiber amplifiers (EDFA’s) offer very attractive prospects for ultra-long-distance nonregenerated systems1 and long-distance unrepeated systems.2 In this paper we present intensity-modulation direct-detection (IM-DD) transmission experiments by using an erbium-doped fiber preamplifier pumped by a 1480-nm laser diode, and we investigate the influence of amplifier gain, type of photodiode [positive-intrinsic-negative (P-I-N) or avalanche photodiode (APD)I, and optical filter bandwidth.
© 1991 Optical Society of America
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