Gain-clamping in two-stage L-band EDFA using an unwanted backward ase from second stage
Document Type
Article
Publication Date
1-1-2003
Abstract
A gain clamping technique for the long wavelength band erbium-doped fiber amplifier (L-band EDFA) is presented. It uses two circulators and a broad band fiber Bragg grating to route wasted backward C-band ASE from the second stage and launch it back into the input end of the first stage of a two-stage amplifier. The two-stage L-band EDFA has shown a small signal gain improvement of 5.7 dB compared to a single-stage amplifier with a slight noise figure degradation. By utilizing the wasted backward ASE, a L-band gain-clamped EDFA with high gain can be realized. Compared to the unclamped case, this gain-clamping technique is effective in reducing the total gain variation as small as 0.3 dB.
Keywords
Gain clamping, Optical amplifier, L-band EDFA, Two-stage EDFA, Amplified spontaneous emission
Divisions
fac_eng,PHYSICS
Publication Title
Optics & Laser Technology
Volume
35
Issue
6
Publisher
Elsevier