Multiplexed transmission system signal to noise equalisation procedure for WDM use inserts additional channel spectra to match measured power value versus frequency characteristic

摘要

A multiplexed transmission system (1) signal to noise equalisation procedure analyses (5) the transmit (2) and receive (6) spectra to plot maximum power against wavelength for all channels with least mean squares or piecewise linear interpolation to define the maximum channel power and inserts additional spectra for extra channels with maximum channel powers so that they are close to the power values on the graph. Includes an Independent claim for equipment using the procedure.