Abstract
As the soaring demand in channel capacity, establishing a network architecture which meets cost-effectiveness and supports population dense area becomes a big challenge. Therefore, increasing the channel capacity and network convergence for the next generation mobile fronthaul without changing the existing receivers’ design is a hot research topic. These also are key techniques to support the next 5G communications. In this thesis, we double the system capacity by applying the polarization division multiplexing (PDM) technique with the proposed self-polarization diversity scheme for PDM direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) system. The proposed polarization de-multiplexing scheme composing of passive components without any polarization tracking mechanism is low-cost and low-complex. Moreover, it can be implemented in the power remote node and thus the existing hardware design at receivers can be retained. We demonstrate the proposed self-polarization diversity PDM DDO-OFDM in both simulation and experience to prove the feasibility of this scheme. Furthermore, we investigate some of important parameters, including the optimization of carrier to signal power ratio (CSPR) and launched power. On the other hand, the polarization state is randomly change during fiber transmission in the polarization multiplexing system. We also discuss the polarization impairments in this scheme.