Patent ID: 6040933
Filing Date: 2000-03-21
Classification: H04J

Abstract:
A method of equalizing performance of a first channel transmitting a first signal from a first transmitter along a first transmission path with respect to performance of a second channel transmitting a second signal from a second transmitter along a second transmission path the equalization being effective at a predetermined location in an optical wavelength division multiplexed system and the location being downstream of an optical amplifier in the first path and downstream of an optical amplifier in the second path, the method comprising:measuring the optical power of the first signal and the second signal at the inputs of each optical amplifier that is upstream of said location; andadjusting the optical power of the first transmitter by an amount dependent upon the sum of the reciprocal of the first signal optical power measurements relative to the sum of the reciprocal of the second signal optical power measurements.