Coherent optical receiver system and method for detecting phase modulated signals

摘要

The invention provides a homodyne coherent receiver, suitable for high speed phase shift keying (PSK), the receiver comprising means for receiving an incoming signal. A signal conditioning sub-system generates a carrier component from the incoming signal; and an optical injection phase locked loop (OIPLL) phase locks the generated carrier component of the incoming signal. The solution of the present invention enables DSP free detection of optical PSK signals, required in next generation fibre transmission systems. In addition, the invention can provide superior receiver sensitivity performance comparing to prior art systems. Also, the method is advantageous in terms of cost and energy efficiency.