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All-optical gain control of in-line erbium-doped fiber amplifiers for hybrid analog/digital WDM systems

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3 Author(s)
Dai, H. ; Bellcore, Red Bank, NJ, USA ; Jin-Yi Pan ; Lin, Chinlon

Automatic gain control using an all-optical feedback loop in in-line erbium-doped fiber amplifiers (EDFA's) used in hybrid analog/digital wavelength division multiplexing (WDM) systems was studied. It is found that the signal level variation for the digital channels can be maintained within a range /spl les/3-dB between the presence and dropout of the analog channel when the narrowband feedback is centered at the amplified spontaneous emission (ASE) peak (/spl sim/1532 nm) with loop loss ranging between 13-22 dB. Robust transmission at 2.5 Gb/s without measurable power penalty was obtained for the digital channels when the EDFA was saturated by either the analog or the control lasing signal.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 6 )