Intensification of noise tolerance against Rayleigh backscattering for bidirectional 10 Gbps WDM-FSO network by employing dual band of OFDM signal

Abstract

A noteworthy scheme to transport dual band 10 Gbps 16 quadrature amplitude modulated orthogonal frequency division multiplexed signal for downlink and uplink channel over 55 km single mode fiber as well as 650-m free space is proposed and demonstrated. Moreover, noise tolerance against Rayleigh backscattering, that arises in bidirectional transmission system is enhanced as different bands of subcarrier are used for uplink and downlink transmission in our proposed system. Negligible power penalty (19 dB under FEC limit) marks the reliability of the proposed design. We observed that dual band subcarrier modulation scheme is able to decrease large power penalty (~8 dB) for total transmission link. The results from our proposed network makes it more potent to give an alternative platform with long reach, less noise, high data rate transmission which is the top most thirst to the upcoming generation.

Keywords

• Rayleigh backscattering (RB) noise
• Orthogonal frequency division multiplexing (OFDM)
• Free space (FSO) communication
• Doublet lens scheme