应用于秒脉冲传递的电光调制器反馈控制系统

介绍了一种应用于光纤时频传递秒脉冲信号(1PPS)调制的马赫-曾德尔调制器(MZM)偏置点反馈控制系统。本系统将电光调制器的偏置点设置在传输曲线的最小值点(Null)和正斜率正交点(Quad+)之间的线性区域，利用光电二极管(PIN)探测输出1PPS信号的低电平电压的波动来检测偏置点的漂移。对测量到的电压信号进行数字处理后通过控制偏置点反馈系统来稳定调制器的偏置点。对反馈控制理论进行了原理推导，并与基于微扰理论的商用偏置点稳定系统进行了对比实验。实验证明该系统可以避免微扰信号对1PPS传输稳定性的影响，传递性能优于商用偏置点稳定系统。实验结果表明，1PPS 传递时延波动的峰峰值为174 ps，均方根值(RMS)为18 ps，在平均时间为104 s时，1PPS的时间阿伦方差(TDEV)下降到1.7 ps。

Abstract

A bias point feedback control system of Mach-Zehnder modulator (MZM) for transferring one pulse per second (1PPS) is used in time and frequency transfer via optical fiber. The low-level voltage of the 1PPS output by photodiode is used to measure the drift of the bias point, which is set between minimum point (Null) and orthogonal point of positive slope (Quad+) on transmission curve. The measured signal is digitally processed and used to control the feedback system to stabilize the bias point. The theoretical derivation of the principle is described and the performance of the system is compared with that of commercial bias point stabilized system based on dither method. The experimental results show that the behavior of our system is better, and the instability results from the dither can be avoided. The peak-peak fluctuated value of the propagation delay of the 1PPS is 174 ps, and the root-mean-square (RMS) value is 18 ps. The time deviation (TDEV) of the 1PPS for the averaging time of 104 s decreases to 1.7 ps.

参考文献

[1] 华芸, 桂有珍, 杨飞, 等. 光纤时频传递系统的中继技术分析[J]. 中国激光, 2012, 39(9): 0905002.

Hua Yun, Gui Youzhen, Yang Fei, et al.. Analysis of repeater for time and frequency dissemination via optical fiber[J]. Chinese J Lasers, 2012, 39(9): 0905002.

[2] M Rost, D Piester, W Yang, et al.. Time transfer through optical fibres over a distance of 73 km with an uncertainty below 100 ps[J]. Metrologia, 2012, 49(6): 772-778.

[3] F Yang, D Xu, Q Liu, et al.. Accurate transmission of time and frequency signals over optical fibers based on WDM and two way optical compensation techniques[C]. CLEO: Applications and Technology, San Jose, 2013: JTu4A. 99.

[4] O Lopez, A Kanj, P Pottie, et al.. Simultaneous remote transfer of accurate timing and optical frequency over a public fiber network [J]. Appl Phys B, 2013, 110(1): 3-6.

[5] P Krehlik, LS′ liwczynski, L Buczek, et al.. Fiber-optic joint time and frequency transfer with active stabilization of the propagation delay[J]. IEEE Transactions on Instrumentation and Measurement, 2012, 61(10): 2844-2851.

[6] Landis G P, Galysh I. NRL/USNO two way time transfer modem design and test results[C]. Proceedings of the 1992 IEEE Frequency Control Symposium, 1992: 317-326.

[7] Lukasz LS′ liwczynski, Przemyslaw Krehlik, Marcin Lipinski. Optical fibers in time and frequency transfer[J]. Meas Sci Technol, 2010, 21(7): 075302.

[8] H Kawakami, T Kobayashi, E Yoshida, et al.. Auto bias control technique for optical 16-QAM transmitter with asymmetric bias dithering[J]. Opt Express, 2011, 19(26): B308-B312.

[9] 冯振华, 付松年, 唐明, 等. LiNbO3马赫曾德尔调制器任意偏置工作点锁定技术的研究[J]. 光学学报, 2012, 32(12): 1206002.

Feng Zhenhua, Fu Songnian, Tang Ming, et al.. Investigation on agile bias control technique for arbitrary-point locking in lithium niobate Mach-Zehnder modulators[J]. Acta Optica Sinica, 2012, 32(12): 1206002.

[10] P S Cho, J B Khurgin, I Shpantzer. Closed-loop bias control of optical quadrature modulator[J]. IEEE Photon Technol Lett, 2006, 18(21-24): 2209-2211.

[11] Ferran Reverter, Oscar Casas, Josep Jordana, et al.. Trigger uncertainty in period-to-code converters based on counters embedded in microcontrollers[J]. Sensors and Actuators A: Physical 2004, 110(1-3): 439-446.

[12] Yupeng Li, Yangan Zhang, Yongqing Huang. Any bias point control technique for Mach-Zehnder modulator[J]. IEEE Photon Technol Lett, 2013, 25(24): 2412-2415.

[13] Xiaonan Hui, Shilie Zheng, Jinhai Zhou, et al.. Electro-optic modulator feedback control in phase-sensitive optical time-domain reflectometer distributed sensor[J]. Appl Opt, 2013, 52(35): 8581-8585.

[14] 闻和, 葛逸宏, 姜欢, 等. 基于相干自混频原理的马赫-曾德尔调制器偏置点的监测[J]. 中国激光, 2009, 36(8): 2035-2041.

Wen he, Ge Yihong, Jiang Huan, et al.. Monitoring bias offset drift of Mach-Zehnder modulator based on coherent hybrid scheme[J]. Chinese J Lasers, 2009, 36(8): 2035-2041.

[15] Yupeng Zhu, Yanfu Yang, Bingyang Yan, et al.. A dither-free bias voltage and driver signal amplitude control technique for optical 8 PSK generator[J]. Chin Opt Lett, 2014, 12(s1): s10606.

[16] Frequency counters. SR620-Universal Time Interval and Frequency Counter[R/OL]. [2015-4-21] http://www.thinksrs.com/downloads/PDFs/Catalog/SR620c.pdf.

程楠, 陈炜, 刘琴, 徐丹, 杨飞, 桂有珍, 蔡海文. 应用于秒脉冲传递的电光调制器反馈控制系统[J]. 中国激光, 2015, 42(9): 0905002. Cheng Nan, Chen Wei, Liu Qin, Xu Dan, Yang Fei, Gui Youzhen, Cai Haiwen. Feedback Control System of Electro-Optic Modulator Used for Transferring One Pulse per Second[J]. Chinese Journal of Lasers, 2015, 42(9): 0905002.

应用于秒脉冲传递的电光调制器反馈控制系统

关于本站 Cookie 的使用提示

全站搜索

应用于秒脉冲传递的电光调制器反馈控制系统

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索