Design and Implementation of Hybrid Medium DP-DQPSK DWDM ROF Transmission System for Different Weather Conditions

Abstract

This document Designing system with Free-space optical (FSO) communication can supply high-speed digital data linkages to rural regions where geography, setup costs, and groundwork safety are major obstacles. Transmission impairments and space loss could be considered major challenges for handling the FSO system. This work has been designed and analyzed a system based on the combination of Dual Polarization Differential Quadrature Phase Shift Keying (DP-DQPSK) and Dense Wavelength Division Multiplexing (DWDM) using the Direct Detection (DD) technique. The proposed system has been utilized with a hybrid transmission medium of Single-Mode Fiber (SMF) with a fixed length of 60 km and FSO with varied lengths of (5, 7, and 9) km. The system was designed with Optisystem software 18 and consist of 64 channels and 14 Gbps of data rate per channel to make the system 5G communication compatible, 3.5 GHz RF electrical signals have been used to modulate the optical carrier. The channels 1,6,12, …,64 were selected as samples among all channels to be investigated and analyzed along with four different atmospheric weather conditions. Additionally, the proposed system is designed to investigate based on different weather attenuation that affected the parameters of Quality Factor (QF) and Bit Error Rate (BER). The significant advantage of the proposed system by using the DD technique, is no reference wave required. Hence, make the system become less complex and possible to be implemented and tested via different weather conditions. Results obtained indicate reverse relation between the QF and both the FSO distance and attenuation. While, BER based parameters showed a direct relation. For light air and haze, the results showed that the system have higher reliability for all the three investigated FSO distances. For the medium haze, the system has shown capability to transfer as far as 7 km. And for the rain condition, the system capability was set to 5 km.

Dual Polarization DQPSK ROF System with Duo Binary Precoding and Hybrid Amplification for Effective Hybrid SMF FSO Transmission Medium

“…In this section, a brief comparison would be carried out concerning the presentation of the original DP-DQPSK DWDM system but without considering the utilization of polarization division multiplexing(PDM),Carrier Suppressed Non Return to Zero(CSNRZ), or using the Dio Binary coding scheme [17]. The comparison would be carried out based on comparing the results of QF and BER obtained from the work in [17] and the proposed work in this article and as listed in Table 3 and Table 4 respectively. It is worth to mention the comparison would be formed based on the averaged values of QF and BER gathered from the two scenarios and all the selected test channels…”

“…The objective of the proposed system is to develop a hybrid transmission system that makes use of both SMF and FSO. If successful, this system would be able to further improve the transmission and efficiency of the proposed system described in [17]. And this was made possible by using the power of hybrid amplification, denoted by (EDFA+OA), which will have various benefits, including decreasing the transmission power and lowering the effect of the FWM problem.…”

“…Comparison between averaged QF values obtained from both the proposed work and the original system proposed in[17] …”