光学学报, 2019, 39 (9): 0906001, 网络出版: 2019-09-09
直接探测系统中两种单边带光信号调制与恢复方法的研究 
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Two Approaches of Single-Side Band Optical Signal Modulation and Reconstruction in Direct Detection System
摘要
从理论上阐释了基于独立双驱动马赫-曾德尔调制器(DDMZM)和同相正交调制器的两种单边带光信号调制原理。通过研究100 Gbit/s速率75 km标准单模光纤传输系统中的16-正交幅度调制单边带信号,分析了两种方法的参数调优原理。接收端使用Kramers-Kronig(KK)算法恢复单边带信号并消除信号与信号间的拍频串扰。结果表明,由于调制器的非线性以及单边带信号的载波信号功率比的影响,在误比特率为3.8×10
-3的7%硬判决前向纠错门限上,使用基于KK算法的接收机的虚载波方法与DDMZM方法相比,能够降低接收光功率约2.3 dB。
Abstract
The modulation principles of the two different single-sideband signals based on independent dual-driving Mach-Zehnder modulator (DDMZM) and the in-phase/quadrature modulator are introduced theoretically. Based on the study of 100 Gbit/s 16-quadrature amplitude modulated single-sideband signal after 75-km standard single-mode fiber transmission, we analyze the principles of parameter optimization of the two approaches. The Kramers-Kronig (KK) algorithm is used to recover the single-sideband signal and eliminate the signal-to-signal beating interference (SSBI) at the receiving end. The results show that, due to effects of the modulator nonlinearity and the carrier signal power ratio, the KK receiver based virtual carrier approach can reduce the received optical power by about 2.3 dB compared with the DDMZM approach at the 7% hard-decision forward error correction threshold with bit error rate of 3.8×10
-3.
高翔, 蔡沅成, 许渤, 邱昆. 直接探测系统中两种单边带光信号调制与恢复方法的研究[J]. 光学学报, 2019, 39(9): 0906001. Xiang Gao, Yuancheng Cai, Bo Xu, Kun Qiu. Two Approaches of Single-Side Band Optical Signal Modulation and Reconstruction in Direct Detection System[J]. Acta Optica Sinica, 2019, 39(9): 0906001.
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