Patent ID: 8811828
Filing Date: 2014-08-19
Classification: H04B

Abstract:
1. An optical communications system comprising a first transmit unit and a first receive unit, with the first transmit unit comprising an electro-optical modulator for modulating one or more data streams with a total bandwidth B into an optical signal by a laser signal with a laser frequency f L1 , the first transmit unit also comprising a transmit filter for outgoing signals from the electro-optical modulator, the first receive unit comprising an electro-optical demodulator for demodulating the optical signal received from the first transmit unit using a Local Oscillator, LO, which produces an optical signal at a second frequency f L2 , wherein the valves for f L1 and f L2 are set at opposite ends of B, which ranges from the lower of f L1 and f L2 to the higher of f L1 and f L2 .