Gain-clamping in two-stage L-band EDFA using an unwanted backward ase from second stage |
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Authors: | S. W. Harun H. Ahmad |
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Affiliation: | Department of Physics, Photonics Laboratory, University of Malaya, 50603, Kuala Lumpur, Malaysia |
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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. |
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Keywords: | Gain clamping Optical amplifier L-band EDFA Two-stage EDFA Amplified spontaneous emission |
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