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基于循环频移器(RFS)的多载波产生原理,得到了间隔为25GHz,载噪比为25dB的20个子载波的多载波输出,将波特率为16Gbaud(即64Gbit/s)的归零码十六进制正交幅度调制(RZ-16QAM)信号加载到这些子载波上,并且进行偏分复用(PDM)生成PDM-RZ-16QAM信号,实验实现了2.56Tbit/s PDM-RZ-16QAM信号792km标准单模光纤(SSMF)的传输和相干接收。实验测得的背靠背相干光波分复用(CO-WDM)系统在误码率为1×10-3的情况下,光信噪比需求比理论值(FEC)增加了4.1dB。传输后,最佳入射光功率处的误码率为4.5×10-3,小于前向纠错的软判决门限(2.4×10-2),此时对应的CO-WDM PDM-RZ-16QAM中心信道信号恢复后x和y偏振方向的星座图清晰规则,说明传输性能很好,并且系统的频谱效率达到了5.1bit/(s·Hz)。
Based on the theory of multi-carrier generation based on cyclic frequency shift (RFS), the multi-carrier output of 20 sub-carriers with 25GHz carrier-to-noise ratio and carrier to noise ratio of 25dB is obtained. The return codes with baud rate of 16Gbaud Hexadecimal Quadrature Amplitude Modulation (RZ-16QAM) signals are loaded onto these subcarriers, and PDM-PDZ is generated for PDM-RZ-16QAM signals. The experimental realization of 2.56Tbit / s PDM-RZ-16QAM Signal Transmission and Coherent Reception of 792km Standard Single-mode Optical Fiber (SSMF). The CO-WDM system experimentally measured an optical signal to noise ratio (SNR) increase of 4.1 dB from the theoretical value (FEC) at a bit error rate of 1 × 10-3. After transmission, the error rate of the best incident optical power is 4.5 × 10-3, which is less than the soft decision threshold of forward error correction (2.4 × 10-2). At this time, the corresponding CO-WDM PDM-RZ-16QAM center The clear rules of the constellations of the x and y polarization directions after the channel signal is restored indicate that the transmission performance is good and the system spectral efficiency reaches 5.1 bit / (s · Hz).