Abstract
Automatic gain control method in Raman amplifier with multi-wavelength pumping scheme is presented. Monitoring of several channel power and feedback pump control is used in the gain control method. The condition to minimize the gain deviation is investigated by numerical simulation. Two monitoring channels are necessary to confine gain deviation in ±0.2dB at two pumps C-band Raman amplifier. In the experiment, gain deviation of 1.5dB is controlled to 0.2dB at 38/40 channels drop, and fast suppression of transient gain excursion is achieved.
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