Optimized Hybrid Optical Communication System for First Mile and Last Mile Problem Solution of Today's Optical Network

We have proposed an optimized hybrid optical communication system for bit-rates of 160Gbps/channel, 100Gbps/channel and 40Gbps/channel. The system composed of 8-channel dense wavelength division multiplexing (DWDM) fiber optic link for longhaul, and wireless optical diffused link for short-haul, multicasting applications. The use of wireless optical diffused links at either end, solve the today's first mile and last mile problem of optical communication network. The wireless optical diffused link uses the optimized coherent optical quadrature phase shift keying modulation technique, as it offers the best performance in the presence of atmospheric turbulence effect. However, the fiber based DWDM system uses symmetrical dispersion compensation technique, with optimized modified duo-binary return-to-zero modulation format as it performs the best, in the presence of fiber non-linearity and dispersion. The system operates with the centre frequency of 193.1THz. The system performance is analyzed in terms of quality-factor, bit error rate, eye opening etc. For the bit rate of 160Gbps, the optimized coverage distance found is 126m of wireless optical diffused link and 450 km of fiber optic link. The proposed system will be highly useful for present and next generation long distance optical communication systems and computer networks.