Patent ID: 8233799
Filing Date: 2012-07-31
Classification: H04B

Abstract:
1. A method of transmitting digital information over a dispersive, nonlinear optical channel, the method including the steps of, at a transmitting end of the optical channel: generating an optical signal which includes an optical carrier and an optical sideband, the optical sideband including data symbols encoded in an information signal comprising a plurality of mutually orthogonal information-bearing frequency subcarriers; and transmitting the optical signal over the optical channel, wherein a transmitted optical power of the optical carrier is less than or equal to a corresponding total transmitted optical power of the optical sideband, and wherein the method further includes the steps of, at a receiving end of the optical channel: processing the optical signal received from the optical channel to increase received power in the optical carrier relative to power in the optical sideband; detecting the processed optical signal to produce a corresponding electrical signal; and performing a frequency domain equalisation of received data symbols encoded in said frequency subcarriers to recover the transmitted digital information.