Patent ID: 7636522

Claim:
An optical transmission network comprising: an optical transmitter including: a plurality of optical sources, each of the plurality of optical sources being configured to output a corresponding one of a plurality of first optical signals in response to the optical transmitter having a first temperature, each of the plurality of first optical signals having a corresponding one of a plurality of first wavelengths, the plurality of first wavelengths forming a wavelength grid; a first circuit coupled to the plurality of optical sources, wherein, in response to the optical transmitter having a second temperature, each of the plurality of optical sources outputs a corresponding one of a plurality of second optical signals, the first circuit being configured to control at least one of the plurality of optical sources such that each of the plurality of second optical signals has a corresponding one of a plurality of second wavelengths, each of the plurality of second wavelengths being uniformly shifted relative to a corresponding one of the plurality of first wavelengths; an optical combiner having a plurality of inputs and an output, each of the plurality of inputs of the optical combine being configured to receive a corresponding one of the plurality of second optical signals and combine the plurality of second optical signals into a wavelength division multiplexed (WDM) optical signal provided at the output of the optical combiner; and an optical receiver including: an optical decombiner having an input and a plurality of outputs, the optical decombiner also having an associated filter grid, the input of the optical decombiner being configured to receive the WDM signal; a photodiode coupled to one of the plurality of outputs of the optical decombiner, the photodiode generating an electrical signal a second circuit coupled to the optical decombiner, the second circuit configured to spectrally shift the filter grid, in response to a control signal, such that at least a portion of the filter grid matches at least a portion of the wavelength grid, wherein the optical decombiner demultiplexes the WDM signal so that each of the plurality of second optical signals is provided by a corresponding one of the plurality of outputs of the optical decombiner; and a third circuit configured to generate the control signal based on, at least in part, the electrical signal.