Transient gain saturation and recovery with 110–340-μsec time constants were observed in erbium-doped fiber amplifiers. This slow response reduces the effects of saturation-induced cross talk and intermodulation distortion associated with multichannel signal amplification. In a two-channel amplification experiment, negligible saturation-induced cross talk was measured at signal modulation frequencies >5 kHz. Increased suppression of saturation-induced cross talk was achieved through feed-forward compensation to reduce low-frequency gain fluctuations.
© 1989 Optical Society of America
Original Manuscript: February 22, 1989
Manuscript Accepted: May 18, 1989
Published: August 15, 1989
C. R. Giles, J. R. Simpson, and E. Desurvire, "Transient gain and cross talk in erbium-doped fiber amplifiers," Opt. Lett. 14, 880-882 (1989)