A method and system for adjusting power at output ports of a wavelength division
multiplexing (WDM) coupler. A loss element may be placed at one or more of the
output ports of the WDM coupler. The loss element may have a filter characteristic
that matches the temperature sensitivity coefficient of the WDM coupler. The filter
characteristic may reject power at one of the two output ports as a function of
temperature. As a result, the loss element may balance the power at the output
ports of the WDM coupler despite temperature variations.
