DocumentCode :
1243539
Title :
Efficient erbium-doped fiber amplifiers incorporating an optical isolator
Author :
Zervas, Michael N. ; Laming, Richard I. ; Payne, David N.
Author_Institution :
Optoelectron. Res. Centre, Southampton Univ., UK
Volume :
31
Issue :
3
fYear :
1995
fDate :
3/1/1995 12:00:00 AM
Firstpage :
472
Lastpage :
480
Abstract :
A composite-EDFA configuration which incorporates an optical isolator has been investigated theoretically and experimentally. The isolator prevents the build-up of the backward-ASE and results in an amplifier with high gain and near-quantum-limited noise figure (NF). The optimum position of the isolator has been calculated as a function of the pump power so that minimum NF and maximum gain are achieved simultaneously. It is shown that under practical pump powers, the optimized composite EDFA exhibits a gain improvement of about 5 dB and a NF reduction in excess of 1.5 dB when compared with an optimized conventional EDFA. It is also shown that with further optimization the composite EDFA can be employed in a practical fiber link as a pre-amplifier without the use of an input isolator. Finally, a high-gain composite EDFA has been experimentally demonstrated which exhibits a gain of 51 dB (54 dB) and NF of 3.1 dB for only 435 mW (93 mW) of pump power
Keywords :
erbium; fibre lasers; laser noise; optical fibre communication; optical isolators; optical pumping; superradiance; 435 mW; 51 dB; 93 mW; backward-ASE; build-up; composite-EDFA configuration; erbium-doped fiber amplifiers; fiber link; gain improvement; high gain; maximum gain; near-quantum-limited noise figure; optical isolator; pump power; pump powers; Erbium-doped fiber amplifier; Isolators; Noise figure; Noise measurement; Optical amplifiers; Optical fiber amplifiers; Optical noise; Optical pumping; Semiconductor optical amplifiers; Stimulated emission;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/3.364402
Filename :
364402
Link To Document :
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