Preemphasis of an optical wavelength multiplex signal

Abstract From the Canadian patent

Methods are described for preemphasizing an optical multiplex signal that comprises a plurality of signals having different wavelengths which are transmitted by a transmitter to a receiver. Power levels for the signals are set at the transmitter and measured at the receiver. A mean power level for the transmit-side signals is ascertained. New signal power level values are ascertained from the current power levels of the signals at the transmitter and at the receiver and set on the transmit side such that signal-to-noise ratios for all signal are approximately equalized at the receiver. In order to make more precise settings for the preemphasis mean gain values and mean attenuations are …