Investigation On High Papr Reduction And Other Key Trchniques In Beyond100Gbps Optical Fiber Transmission

With the rapid development of cloud computing, Internet of Things, Mobile Internet, FTTx and many other high-speed broadband network and services, people’s demand for bandwidth resources is also growing rapidly. Especially with the comprehensive popularization of3G services and the promotion of the emerging4G services, pressure on the backbone network bandwidth is more and more increasing, and the bandwidth resource shortage has become a key network bottlenecks. With the development of technologies, the100Gbps backbone network has begun to deploy, but only meet the bandwidth requirements within the next five years. As a result, the key technologies of beyond100Gbps high-speed transmission systems has become a research hotspot. In this paper, the high PAPR problem of480Gbps PM-CO-OFDM system solution is analyzed and solved in detail and Nyquist pulse shaping and the algorithm for compensating the damage of tight filtering and optical fiber nonlinearity are mainly processed in1.2Tbps PM-DQPSK Nyquist WDM system solution. Concrete research content are listed as follows.1. This paper has analyzed the reason of PAPR in coherent optical OFDM system and also its impacts on the nonlinearity tolerance performance of480Gbps PM-16QAM-CO-OFDM system. Then a low complexity PAPR reduction algorithm based on orthogonal segmented phase rotation after the fully comparison of various PAPR reduction methods has been propose. Moreover, we have carried out simulations with480Gbps PM-16APSK CO-OFDM transmission system to prove the effectiveness of the proposed method. Simulation results have showed that the complexity of the same grouped SLM is8times larger than that of orthogonal segmented phase rotation in the condition of1dB optimal launch power improvement.2. For1.2Tbps PM-DQPSK Nyquist WDM system solution, the methods of Nyquist pulse shaping and compensation algorithms for the damage of tight filtering and optical fiber nonlinearity have been researched, including detailed analysis of the advantages and disadvantages of each scheme as well as the application scenarios. X-type anti-aliasing filter must use the third MZI to multiplex any two subcarrier signals. To solve this issue, a double MZI cascaded optical fiber has been designed and simulated, whose results have showed that it can effectively achieve Nyquist pulse shaping together with compensation algorithm for tight filtering and optical fiber nonlinearity.3.Simulation and experimental studies of1.2Tbps PM-DQPSK N-WDM system have been implemented, focused on the analysis and comparison of different algorithms of tight filtering and optical fiber nonlinearity damage compensation. Meanwhile, for long distance transmission, the interaction between fiber loss and fiber nonlinearity has been analyzed in detail and verified experimentally.