Spectrally-Sliced Coherent Receiver Utilizing a Gain-Switched Optical Frequency Comb

The spectrally-sliced coherent receiver is an attractive solution for future optical access network applications where cost a sensitive factor, as it enables reduced bandwidth of the analog front-end components and analog-to-digital convertors when compared to conventional intradyne receiver. In proof-of-concept experiment, we demonstrate single-polarization 50 Gb/s QPSK C-band transmission experiment over 40 km standard (G.652) fiber using bandwidths low 6.25 GHz also utilize array local oscillator lines derived from injection locked gain-switched frequency comb, which can be realized compact photonic integrated circuit. This paper analyses influence comb properties on quality reconstructed signal. critical parameters considered in this study include power flatness, mutual line coherence, suppression ratio after demultiplexing lines. We have shown that with practically achievable parameter values, operate less than 1 dB sensitivity penalty scheme has potential provide low-cost next-generation networks.