Gain-clamping in two-stage L-band EDFA using an unwanted backward ase from second stage
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-sta...
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| Main Authors: | , |
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| Format: | Article |
| Published: |
Elsevier
2003
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| Subjects: | |
| Online Access: | http://eprints.um.edu.my/19641/ http://dx.doi.org/10.1016/S0030-3992(03)00049-5 |
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| Institution: | Universiti Malaya |
| Summary: | 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. |
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