| 摘要 |
<p>An apparatus and method are provided for amplifying a signal having several multiplexed channels of different wavelengths. In one embodiment, an amplifier (100) is provided having a doped fiber (120) coupled to an input (105), a pump (145) coupled to the doped fiber to provide an output to amplify the signal therein and a control system (130) for controlling the pump. The control system (130) has a detector (170) for measuring power of the signal and a controller (180) for adjusting power to the pump (145) based on predetermined criteria and the measured signal power. The pump power is adjusted as a linear function of the signal power by including within the predetermined criteria a multiplier by which the signal power is multiplied, and an offset that is added to the product of the multiplier and the signal power to ensure that the power applied to the pump (145) is non-zero even for zero signal power. Preferably, the controller (180) can automatically adjust pump power to provide equal and constant gain to each channel even when channels are added or removed. More preferably, the controller (180) can provide a transient response of less than 200 νs when channels are added or removed.</p> |
