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Gain control in erbium-doped fibre amplifiers by an all-optical feedback loop

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1 Author(s)
Zirngibl, M. ; AT&T Bell Labs., Holmdel, NJ, USA

An all-optical feedback loop is demonstrated which effectively suppresses slow, signal-induced gain fluctuations in Er-doped fibre amplifiers (EDFAs). Gain control is achieved by operating the amplifier in a ring-laser configuration. The working principle is shown theoretically and experimentally by coupling a selected wavelength of the ASE at the output of the EDFA back to the input. Such a feedback loop, which can be fabricated out of all-fibre passive components, could be easily implemented in any system using EDFAs.

Published in:

Electronics Letters  (Volume:27 ,  Issue: 7 )