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Broad-band erbium-doped fiber amplifier flattened beyond 40 nm using long-period grating filter

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5 Author(s)
Wysocki, P.F. ; Lucent Technol., Bell Lab., Murray Hill, NJ, USA ; Judkins, J.B. ; Espindola, R.P. ; Andrejco, M.
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Broad-bandwidth amplification is essential for the construction of high-capacity multichannel communication systems. We describe a silica-based erbium doped fiber amplifier (EDFA) with a flat gain bandwidth exceeding 40 nm. The dual-stage EDFA includes a precisely designed inter-stage long-period fiber grating filter with more than 14-dB peak attenuation. By careful choice of the filter spectrum and fiber lengths, this EDFA is flat to within 1 dB over 40 nm while producing a noise figure below 4.0 dB and nearly +15-dBm output power.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 10 )