基于多载波的相干波分复用太比特传输实验研究

发布时间：2018-10-05 12:19

【摘要】：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)。
[Abstract]:Based on the multicarrier generation principle of the cyclic frequency shifter (RFS), the multicarrier outputs of 20 sub-carriers with an interval of 25 GHz and a carrier to noise ratio of 25dB are obtained. The return code hexadecimal quadrature amplitude modulation (RZ-16QAM) signals with a baud rate of 16Gbaud (64Gbit/s) are loaded onto these subcarriers. The PDM-RZ-16QAM signal is generated by partial division multiplexing (PDM), and the transmission and coherent reception of 2.56Tbit/s PDM-RZ-16QAM signal 792km standard single mode fiber (SSMF) are realized experimentally. The experimental results show that the optical signal-to-noise ratio (SNR) requirement of the back-to-back coherent optical wavelength division multiplexing (CO-WDM) system increases by 4.1 dB compared with the theoretical value (FEC) when the BER is 1 脳 10 ~ (-3). After transmission, the BER at the optimal incident light power is 4.5 脳 10 ~ (-3), which is less than the soft decision threshold of forward error correction (2.4 脳 10 ~ (-2). At this time, the constellation diagram of x and y polarization direction of the corresponding CO-WDM PDM-RZ-16QAM central channel signal recovers clearly, which shows that the transmission performance is very good. And the spectrum efficiency of the system is up to 5.1bit/ (s Hz).
【作者单位】：北京邮电大学信息光子学与光通信国家重点实验室;聊城大学山东省光通信科学与技术省重点实验室;
【基金】：国家自然科学基金(61205065) 高等学校博士学科点专项科研基金(20110005110014) 信息光子学与光通信国家重点实验室(北京邮电大学)开放基金山东省自然基金项目(ZR2010FM043)
【分类号】：TN929.11

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