| In this paper，the performance of ACO-OFDM signal transmited in single mode opticalfiber (SMF) is studied. It is anylzed theoretically and experimentally that the realization ofACO-OFDM system, the impact of the number of subcarriers and convolutional encoding forthe system. Firstly, recent studies of ACO-OFDM are reviewed, and then the similarities anddifference between ACO-OFDM and OFDM are explained. Secondly, mathematical mode ofthe OFDM and the asymmetrically clipped principle are built and analyzed. By software, theACO-OFDM commnunication systems transmitted in SMF is simulated. The influence on thesystem arguments in ACO-OFDM by the number of subcarriers is investigated. Theimportance of convolutional encoding for ACO-OFDM is discussed. The details are describedas follows:(1) The experimental platform of ACO-OFDM in SMF communimation system is built.Firstly, the mathematical mode of ACO-OFDM is illustrated, then it is realized by softwarethat the ACO-OFDM commnunication systems when it is transmitted in SMF. Electrical andoptical signal are simulated respectively in Matlab and Optisystem.(2)The impact of the number of subcarriers on the ACO-OFDM in SMF communimationsystem is investigated. Computational complexity, the peak to average power ratio (PAPR),transmission bandwidth and bit error rate (BER) of the system are studied. It is provedtheoretically and experimentally that the optimal number of the subcarriers is exist when thetransmission rate is constant.(3) The application of convolutional code for ACO-OFDM in SMF communimationsystem is investigated through experiments. The principle of encoding and decoding ofconvolutional code are demonstrated and the implementaion process is given. The experimentresults show that convolutional encode and decoding can improve the reliability andtransmission distance. Besides, the conversion between transmission efficiency andtransmission distance can be realized by convolutional code. |
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