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为解决塑料光纤(POF)带宽窄、模式色散大的缺陷,提高光接入网的带宽利用率和色散容限,本文在光接入网中使用自适应比特分配算法的正交频分复用(OFDM)调制方式,利用OFDM系统极佳的频带利用率特性,提高了光接入系统的带宽利用率,并降低了系统的误码率(BER)。在搭建的实验系统中,成功地在不足2.5GHz带宽的光信道中完成了10 Gb/s的光OFDM(OOFDM)系统,从而证明了自适应比特分配算法在OOFDM系统中的有效性和可行性。
In order to solve the problem of narrow bandwidth and large mode dispersion of plastic optical fiber (POF), and to improve the bandwidth utilization and dispersion tolerance of optical access network, this paper uses the adaptive bit allocation algorithm in Optical Access Network (Orthogonal Frequency Division Multiplexing) (OFDM) modulation mode. By utilizing the excellent bandwidth utilization efficiency of the OFDM system, the bandwidth utilization rate of the optical access system is increased and the system BER is reduced. In the experimental system, a 10 Gb / s optical OFDM (OOFDM) system is successfully implemented in an optical channel with less than 2.5 GHz bandwidth, which proves the effectiveness and feasibility of adaptive bit allocation in OOFDM system .