Study Of Peak-to-Average Power Ratio Suppression In Optical Orthogonal Frequency Division Multiplexing Systems

As a new type of multi-carrier multiplexing technology,orthogonal frequency division multiplexing(OFDM)combines optical fiber communication and OFDM technology,and has the advantages of high spectrum utilization and high dispersion tolerance.However,the excessive peak-to-average power ratio(PAPR)in optical OFDM signals can seriously affect system performance.Firstly,based on the conventional SLM(C-SLM)algorithm,a multistage optimal phase SLM(MSOP-SLM)based on SLM algorithm is proposed to increase the phase types.The algorithm calculates the optimal phase and expands the phase type by cascading SLM algorithm.The simulation shows that the MSOP-SLM algorithm has higher PAPR suppression gain than the SLM algorithm with the same complexity.Secondly,based on the generation method of SLM algorithm phase sequence,a multi-population genetic algorithm(MPGA)SLM algorithm(MPGA-SLM)is proposed.The algorithm uses MPGA to assist SLM,optimizes the phase sequence generation process,and accelerates the convergence speed.Simulation and experiments show that the MPGA-SLM algorithm can improve the bit error rate(BER)performance and reduce the PAPR.Finally,a probabilistic PAPR suppression algorithm based on Flexible Polar Coding(FPC)is proposed.The FPC algorithm is inspired by the C-SLM,and adopts a flexible block coding method to reduce the probability of high PAPR.Simulations and experiments show that the proposed FPC achieved the similar PAPR suppression performance as that of the C-SLM and the reliability of the system is significantly improved.