Efficient erbium-doped fibre amplifiers incorporating an optical isolator

Zervas, M.N., Laming, R.I. and Payne, D.N. (1995) Efficient erbium-doped fibre amplifiers incorporating an optical isolator IEEE Journal of Quantum Electronics, 31, (3), pp. 472-80. (doi:10.1109/3.364402).


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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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1109/3.364402
ISSNs: 0018-9197 (print)
Related URLs:
ePrint ID: 78278
Date :
Date Event
Date Deposited: 11 Mar 2010
Last Modified: 18 Apr 2017 20:23
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/78278

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