Recent advancement of RB noise alleviation techniques in different communication networks and its lacunae: a review

Abstract Telecommunication networks are forced to be advanced day by day for high data rate transportation over long-reach to fulfil the ever-increasing demand of the subscribers. Different used schemes, modulation techniques are smart enough to support high data rate transmission over long distance but some impairment like Rayleigh backscattering (RB) brings a limitation on data rate or transmission distance. RB noise effect arises and affects the system performance when more than one signal of similar wavelengths are transmitted through a same feeder fiber in full-duplex networks and different researchers have already proposed various schemes to eliminate RB noise effect in different transport networks. The present paper surveys and analyses the techniques which proposed in last 15 years for mitigation of RB noise in communication systems. The origin of RB and the impact of it in different communication systems are also explained. All the proposed networks are aimed to support next generation communication systems by providing high data rate (up to 160 Gbps downstream and 20 Gbps upstream) over long reach (up to 115 km single mode fiber link) with lesser RB noise effect but exact quantification of RB noise mitigation is not reported till now which could be a future scope for the new researchers.