光学学报, 2011, 31 (3): 0306001, 网络出版: 2011-02-21   

只需一个解调器的偏分复用差分相移键控系统实验实现

Experimental Realization of Polarization Multiplexing Differential Phase Shift Keying System Using Only One Demodulator
作者单位
北京邮电大学信息光子学与光通信教育部重点实验室, 北京 100876
摘要
偏分复用技术是提高系统传输速率的有效方法之一。搭建了被称为双偏振态差分相移键控(Dual-Pol. DPSK)码的新型偏分复用实验系统,它与具有相同的比特波特比的差分正交相移键控(DQPSK)调制方式相比,接收机要简单很多。与传统的偏振分解复用(POLMUX)技术相比,它无需偏振控制或偏振跟踪,只需一个解调器和一个平衡探测器以及电域的多电平判决就可以将两个偏振正交信号同时解调出来,大大降低了系统的复杂度。利用数值仿真的方法,分析了Dual-Pol. DPSK系统对噪声及偏振模色散(PMD)的容忍度,并且与单偏振态的差分相移键控(DPSK)及DQPSK系统进行了比较。结果表明,由于受符号间欧氏距离的限制,Dual-Pol. DPSK码对噪声非常敏感,在误码率为10-3时,它对信噪比(SNR)的要求比同速率的DQPSK系统高7 dB;由于频谱利用率高,相比于同速率的DPSK,Dual-Pol.DPSK对PMD的容忍度高5 ps,但与DQPSK相比,Dual-Pol. DPSK码抗PMD的能力要差一些。
Abstract
Polarization multiplexing is one of the effective methods to improve the transmission rate of fiber-optic communication system. A novel configuration polarization multiplexing differential phase shift keying (PolMUX-DPSK) format called dual-polarization differential phase shift keying (DPSK) (Dual-Pol. DPSK) is proposed and realized experimentally. It has the same bits symbol ratio with differential quaternary phase shift keying (DQPSK), but it needs a much simpler receiver. Unlike the conventional POLMUX-DPSK, no polarization control or polarization selection is required at the receiver. The polarization-multiplexed symbols are decoded by one Mach-Zehnder delay interferometer (MZDI) and electrical multilevel detection. The tolerances to noise and polarization mode dispersion (PMD) are analyzed and compared with single polarization state DPSK and DQPSK by numerical simulation. The results show that Dual-Pol. DPSK is more sensitive to the noise than DQPSK due to the smaller distance between symbols. For bit error rate (BER) at 10-3, the desired signal-to-noise radio of Dual-Pol. DPSK is 7dB higher than DQPSK. Compared with DPSK, Dual-Pol. DPSK has 5 ps higher PMD tolerance, but its PMD tolerance is lower than DQPSK.

席丽霞, 秦江星, 赵鑫媛, 张晓光. 只需一个解调器的偏分复用差分相移键控系统实验实现[J]. 光学学报, 2011, 31(3): 0306001. Xi Lixia, Qin Jiangxin, Zhao Xinyuan, Zhang Xiaoguang. Experimental Realization of Polarization Multiplexing Differential Phase Shift Keying System Using Only One Demodulator[J]. Acta Optica Sinica, 2011, 31(3): 0306001.

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