Dynamic power equalization of many wavelength-division-multiplexed channels in a fiber-optic system

摘要

A dynamic power equalization module (10) for an optical network is provided. It includes a module input (16) for receiving an optical transmission (14) containing a combination of different channels (C1-Cn). Each channel (C1-Cn) has a different characteristic wavelength (lambd1-lambdn) and different varying power. A power equalization device that is polarization insensitive is connected between the module input (16) and a module output (20). The power equalization device is driven by RF acoustic signals (26). A feedback loop (22) receives at least a portion of output from the module output (20) and generates, based upon a comparison of relative powers of the different channels (C1-Cn), the RF acoustic signals (26) which drive the power equalization device. The power equalization device is driven such that it dynamically controls transmission of the different channels (C1-Cn) to substantially equalize power differentials therebetween. The power equalization device includes a parallel array of acousto-optic modulators (AO1-AOn).