Patent ID: 6954590

Claim:
A wavelength division multiplexed optical transmission system comprising: a plurality of optical transmitters configured to transmit a plurality of different signal wavelengths and at least one tuning wavelength; a plurality of optical receivers, each including an optical filter having a filter bandwidth including at least one signal wavelength and a percentage of at least one of the at least one tuning wavelength, and an optical to electrical signal converter configured to receive the at least one signal wavelength from said filter; a first tuning optical to electrical converter configured to receive a first portion of the tuning wavelength reflected by said filter; a second tuning optical to electrical converter configured to receive a second portion of the tuning wavelength passed by said filter; and, a filter controller configured to tune the filter bandwidth based on the relative proportion of first and second portions of the tuning wavelength provided to the first and second tuning optical to electrical converters.