Patent ID: 9100137
Filing Date: 2015-08-04
Classification: H04J,H04L

Abstract:
1. A method of reducing crosstalk among subcarriers of a super-channel, the method comprising: receiving a plurality of data streams for transmission over an optical transport network as the super-channel, the super-channel comprising a plurality of subcarrier bands, including two edge subcarrier bands; assigning optical frequencies to the subcarrier bands, including respectively assigning the two edge subcarrier bands to a first optical frequency and a last optical frequency that define a fixed bandwidth of the super-channel, wherein the remaining subcarrier bands are respectively assigned to equally spaced optical frequencies between the first optical frequency and the last optical frequency; selecting, from the remaining subcarrier bands, at least two intermediate subcarrier bands; optically modulating the data streams into the subcarrier bands using the assigned optical frequencies, wherein a frequency shift is applied to the equally spaced optical frequencies of the intermediate subcarrier bands, the frequency shift resulting in the intermediate subcarrier bands being optically modulated at variably spaced optical frequencies between the first optical frequency and the last optical frequency; and combining the subcarrier bands into the super-channel, wherein selecting the intermediate subcarrier bands further comprises: