Hybrid Multiplexing (OTDM/WDM) Technique for Fiber Optic Communication

Today's world needs high data transmission and huge bandwidth systems through optical fiber communication networks. For achieving that, passive optical networks (PON) are much more in practice. In this work, we have presented a hybrid multiplexed system, containing 4 channel optical time domain multiplexing (OTDM) and 2 channel wavelength division multiplexing (WDM) schemes. To utilize the available optical bandwidth for multiplexed system, carrier-suppressed return to zero (CSRZ) modulation technique is used. To mitigate the dispersion effect in fiber, symmetrical dispersion compensation scheme is used in the proposed system. Erbium-doped fiber amplifier (EDFA) is used to compensate the linear loss. The system is simulated for data rate of 40 Gbps. A link distance of 1,150 km is achieved with the proposed system. The main purpose of hybrid multiplexing of OTDM and WDM is to get higher spectral efficiency and cost reduction. Due to the use of hybrid multiplexing, it is possible to design a 8 × 40 Gbps system with the help of two optical sources. The performance of the proposed system is analyzed in terms of bit error rate, received power, optical time domain, frequency domain signal and Q-factor. The system will be highly useful for next generation high-speed fiber optic communication applications.