Patent ID: 7469102

Claim:
An apparatus comprising: a wavelength tracking component to determine a difference between transmission band of wavelengths of a first multiplexer/demultiplexer and a second multiplexer/demultiplexer in order to provide a control signal to match the transmission band of wavelengths of the first multiplexer/demultiplexer and the second multiplexer/demultiplexer, wherein the first multiplexer/demultiplexer is located in a first location and the second multiplexer/demultiplexer is located in a second location remote from the first location, wherein the first multiplexer/demultiplexer receives a first optical signal containing a first band of wavelengths; the second multiplexer/demultiplexer receives a second optical signal containing a second band of wavelengths; and wherein the wavelength tracking component determines the difference based on measuring an optical power of a third optical signal containing the second band of wavelengths after passing through the first multiplexer/demultiplexer; and a transmission wavelength controller to alter an operational parameter of the first multiplexer/demultiplexer based on the control signal to control the transmission band of wavelengths of the first multiplexer/demultiplexer.