[1]唐勇,孙小菡,张明德,等.WDM系统中改进的Q值在线检测方法[J].东南大学学报(自然科学版),2002,32(2):181-184.[doi:10.3969/j.issn.1001-0505.2002.02.007]
　Tang Yong,Sun Xiaohan,Zhang Mingde,et al.Improved on-line Q-factor measurement method in wavelength-division-multiplexing systems[J].Journal of Southeast University (Natural Science Edition),2002,32(2):181-184.[doi:10.3969/j.issn.1001-0505.2002.02.007]
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WDM系统中改进的Q值在线检测方法()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
32
期数:
2002年第2期
页码:
181-184
栏目:
信息与通信工程
出版日期:
2002-03-20

文章信息/Info

Title:
Improved on-line Q-factor measurement method in wavelength-division-multiplexing systems
作者:
唐勇;  孙小菡;  张明德;  丁东
东南大学电子工程系,南京 210096
Author(s):
Tang Yong;  Sun Xiaohan;  Zhang Mingde;  Ding Dong
Department of Electronic Engineering, Southeast University, Nanjing 210096, China
关键词:
光纤通信系统;  Q值;  信号质量;  判决电平
Keywords:
optical communication systems;  Q-factor;  signal quality;  decision threshold
分类号:
TN919.2;TN29
DOI:
10.3969/j.issn.1001-0505.2002.02.007
摘要:
提出了一种改进的Q值在线检测方法,指出可以使用不同的门限电平分别对空号和传号进行判决,并引入噪声系数表征高速光纤通信系统信号噪声的幅度变化范围,相应地修正了空号和传号均方差的计算表达式.基于改进的方法设计了实验方案,采用数字信号处理芯片(DSP)技术开发了Q值测试板并进行了模拟测试.在一定噪声范围内,测试结果与理论值吻合得较好.相比于现有的Q值在线检测方法,改进的方法更精确地表示了传输信号的信噪比,具有更好的实用性.
Abstract:
The principle of an improved method for on-line Q-factor measurement is presented, describing that the space levels and the mark levels can be decided respectively by different thresholds. By introducing a coefficient that denotes the intensity of noise in high-speed optical communication systems, the expressions for calculating the root-mean-square deviation of spaces and marks are modified. Based on the novel method presented, an experiment scheme by the digital signal processor(DSP)approach is designed and a Q-factor testing board is developed. The simulating results coincide with the theoretical values when the optical noise amplitude vibrating in a practical range. With the improved method the signal-to-noise ratio(SNR)of practical systems can be measured more accurately than previously published ones.

参考文献/References:

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[3] Matera F,Settembre M.Role of Q-factor and of time jitter in the performance evaluation of optically amplified transmission systems [J].IEEE Journal of Selected Topics in Quantum Electronics, 2000,6(2):308-316.
[4] Ohteru S,Takachio N.Optical signal quality monitor using direct Q-factor measurement[J]. IEEE Photonics Technology Letters, 1999,11(10):1307-1309.
[5] Li J,Sun X,Zhang M,et al.Q factor on-line detection in optical fiber LANs [J].Internal Journal of Infrared and Millimeter Waves,2001, 22(5):715-722.
[6] Shake I,Takara H,Uchiyama K,et al.Quality monitoring of optical signals influenced by chromatic dispersion in a transmission fiber using averaged Q-factor evaluation [J].IEEE Photonics Technology Letters,2001,13(4):385-387.

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备注/Memo

备注/Memo:
作者简介: 唐勇(1973—), 男, 博士生; 孙小菡(联系人),女,教授,博士生导师,xhsun@seu.edu.cn.
更新日期/Last Update: 2002-03-20