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数值模拟了一种利用高非线性光纤(HNLF)中的交叉相位调制(XPM)效应实现归零(RZ)码到非归零(NRZ)码的转换方案,讨论了RZ信号的占空比对转换后NRZ码性能的影响。转换后NRZ码的性能受输入RZ信号占空比的影响,当RZ信号占空比在30%～50%范围内可实现较好地转换。同时,实验实现了码率为10Gb/s、占空比为33%的RZ码到NRZ码的转换,对比了连续探测光的原始谱和展宽谱,给出了转换前后信号的典型眼图和误码率(BER)特性。结果显示,在误码率为10-9时,由RZ码转换到NRZ码引入的功率代价不到1dB。进一步的实验验证了这种方案在大于160Gb/s或更高码率下的可行性。
A conversion scheme of zero return (RZ) code to NRZ code using the cross-phase modulation (XPM) effect in high nonlinear fiber (HNLF) is numerically simulated. The duty cycle of RZ signal is discussed Effect of NRZ code performance after conversion. The performance of the converted NRZ code is affected by the duty cycle of the input RZ signal, which is well converted when the duty cycle of the RZ signal is in the range of 30% to 50%. At the same time, the experiment realizes the conversion from RZ code to NRZ code with code rate of 10Gb / s and duty ratio of 33%, compares the original spectrum and broadening spectrum of continuous detection light, and gives the typical eye diagram of the signal before and after conversion Bit error rate (BER) characteristics. The result shows that the power cost introduced by the conversion from RZ code to NRZ code is less than 1 dB at bit error rate of 10-9. Further experiments verify the feasibility of this scheme at code rates greater than 160 Gb / s or higher.