Long-wavelength erbium-doped fiber amplifier gain enhanced by ASE end-reflectors

Nilsson, J., Yun, S.Y., Hwang, S.T., Kim, J.M. and Kim, S.J. (1998) Long-wavelength erbium-doped fiber amplifier gain enhanced by ASE end-reflectors. IEEE Photonics Technology Letters, 10 (11), 1551-1553. (doi:10.1109/68.726746).

Record type: Article

Abstract

We use for what we believe is the first time narrowband end-reflectors to reduce losses through short-wavelength amplified stimulated emission (ASE) in silica-based erbium-doped fiber amplifiers operating at wavelengths above 1570 nm. The end-reflectors feed a small fraction of the ASE, up to a few tenths of a milliwatt, back into the amplifying fiber. The reflected ASE compresses the short-wavelength gain and thus reduces the ASElosses, from, e.g., 50 mW for a launched pump power of 110 mW at 980 nm without end-reflector to 10 mW with an optimized end reflector. We investigate possible improvements of gain (around 5 dB) and output power (up to 17 mW), and the influence of the amount and wavelength of the feedback.

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