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Single-Stage Booster Amplifier with Two 980 nm Pumps Stabilized by Fiber Grating

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Abstract

Optical amplifiers using 980 nm pumps are desirable because of the inherent low amplifier noise figure, in some cases flatter amplifier gain and the high electrical-to-optical conversion efficiency of the strained quantum well InGaAs pump lasers. Simulations we have performed, show that the most cost effective design for an erbium-doped fiber (EDF) booster amplifier is the co- and counter-pumped single-stage amplifier. Also, for reliability reasons, pump redundancy is desirable. However, an amplifier in this configuration allows the two pumps to interact with each other, shifting their peak emission wavelengths. The 980 nm pump lasers are very sensitive to reflections. Weak reflections can shift the wavelength from 970 nm to 1040 nm, out of the erbium doped fiber absorption spectrum [1]. Isolators could be used to prevent the pumps from interacting; but, 980 nm isolators are expensive and have high insertion loss.

© 1995 Optical Society of America

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