| 摘要 |
A description is given of a method for per-channel power control in a DWDM transmission network comprising at least one optical amplifier that can be gain-controlled, comprising the steps of a) injection of a dummy signal into the optical transmission network in addition to the communications signals, with the dummy signal being controllable with regard to its power, b) determination of a channel-average Q-factor, c) increasing the per-channel gain by means of increasing the amplifier input power or lowering the dummy signal power, d) redetermination of the channel-average Q-factor, e) comparing the two channel-average Q-factors and computing their quotient, whereupon in case of a quotient higher than 1 steps c) to e) need to be repeated, with the procedure being terminated after the maximum per-channel gain has been achieved, and in case of a quotient lower than 1 the procedure is being resumed with step f), f) lowering the per-channel gain by means of increasing the dummy signal power or lowering the amplifier input power, g) redetermination of the channel-average Q-factor, h) comparing the two channel-average Q-factors and computing their quotient, whereupon in case of a quotient higher than 1 steps f) to h) need to be repeated, with the procedure being terminated after the minimum per-channel gain has been achieved, and in case of a quotient lower than 1 the procedure is being terminated. <IMAGE>
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