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Enhancement of pump conversion efficiency in preamplified L-band erbium-doped fiber amplifiers

✍ Scribed by C.Y. Hung; Likarn Wang

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
234 KB
Volume
259
Category
Article
ISSN
0030-4018

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✦ Synopsis

A new configuration of L-band erbium-doped fiber amplifiers (EDFAs) is presented here. The system contains a double-pass L-band EDFA and an optical preamplifier. Different from conventional preamplified double-pass L-band EDFA systems in which only the forward ASE of the preamplifier is re-used as an auxiliary pump, the new system recycles the backward ASE of the preamplifier as well. Two kinds of main L-band EDFAs are studied, both of which include a section of un-pumped erbium-doped fiber placed in a loop reflector. An improvement of up to 110% in pump conversion efficiency is demonstrated with the proposed recycling of the backward ASE, with respect to the system without recycling.

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