| 摘要 |
In a WDM transmission system having a transmission path including a concatenation of laser diode pumped optical amplifiers 20, the gain spectrum of an amplifier is controlled at least in part by a feedback loop regulating the temperature, and thus the emission wavelength, of its laser diode pump 21. The feedback loop may for instance derive its control signal from a measure of the drive current applied to the pump (as shown), of the emission wavelength of the pump, or of the disparity between the power output from the amplifier in one of the multiplexed signal channels and that from at least one other of the channels. |
