Patent ID: 9461751
Filing Date: 2016-10-04
CPC Classification: H04B

Claim Text:
1. A method of transmitting a data signal in an optical communications system, the method comprising: processing the data signal to generate In-Phase and Quadrature analog drive signals, the processing including mixing In-Phase and Quadrature components of the data signal with a mixing signal having a first predetermined frequency to generate corresponding In-Phase and Quadrature composite signals, and bandpass filtering the In-Phase and Quadrature composite signals using a filter characteristic having a cut-off frequency equal to the first predetermined frequency to generate the In-Phase and Quadrature analog drive signals such that frequency components of the data signal lay in at least two separated spectral bands, each spectral band having a respective bandwidth that is less than a bandwidth of the data signal; and modulating an optical carrier light using the In-Phase and Quadrature analog drive signals.