采用相干技术的高分辨光谱检测系统设计
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摘要
采用外差相干技术理论上可以获得低至MHz量级甚至更高分辨率的光谱信息。介绍了一种基于外差相干技术方法实现的光谱检测系统,并推导了90°光学混频器和平衡探测器的信号传输原理,讨论了本振光和滤波器的性能参数与光谱检测分辨率的关系。利用光通信系统设计软件OptiSystem建立了完整的相干光谱检测系统的模型,并使用波长扫描和迭代运算模拟了实际本振光信号的工作模式,验证了该方案实现高分辨光谱分析的可行性和优越性。最后分析了对于频率间隔为40 MHz的被测信号,不同的本振光扫描线宽、扫描步长和滤波器带宽参数组合实现的仿真结果,并总结了光谱检测精度对本振光和滤波器等关键参数的要求。
The optical spectrum details could b e detected theoretically even as low as MHz lever based on heterodyne interference principle. A scheme design of optical spectrum detecting system based on heterodyne interference technique was introduced,in which the signal transmission principle from the 90°optical mixer to the balanced detector was deduced. Moreover, the relationship between the settings of the local oscillator, as well as the filter intermediate frequency and the system resolution was concluded. The compact spectrum detecting system is built upon OptiSystem software, in which the wavelength sweep and iteration could be used to simulate actual local oscillator operating mode, thus the feasibility and superiority of the ultra-high resolution spectrum analysis function were verified. In the end, the simulation results of different linewidth and scanning step length of local oscillator, as well as the filtering parameters was given in 40 MHz frequency interval. The resolution requirement on the local oscillator and filter was concluded.
The optical spectrum details could b e detected theoretically even as low as MHz lever based on heterodyne interference principle. A scheme design of optical spectrum detecting system based on heterodyne interference technique was introduced,in which the signal transmission principle from the 90°optical mixer to the balanced detector was deduced. Moreover, the relationship between the settings of the local oscillator, as well as the filter intermediate frequency and the system resolution was concluded. The compact spectrum detecting system is built upon OptiSystem software, in which the wavelength sweep and iteration could be used to simulate actual local oscillator operating mode, thus the feasibility and superiority of the ultra-high resolution spectrum analysis function were verified. In the end, the simulation results of different linewidth and scanning step length of local oscillator, as well as the filtering parameters was given in 40 MHz frequency interval. The resolution requirement on the local oscillator and filter was concluded.
引文
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[3]Yang Xianglin.Optical Fiber Communication System[M].Beijing:National Defence Industry Press,2000:139-141,217-220.
[4]Li Fang,He Jun,Xu Tuanwei,et al.Fiber laser sensing technology and its applications[J].Infrared and Laser Engineering,2009,38(6):1025-1032.(in Chinese)李芳,何俊,徐团伟,等.光纤激光传感技术及其应用[J].红外与激光工程,2009,38(6):1025-1032.
[5]Chen Yuchen.Research of relative phase measurement of periodical signal based on ultra-high resolution optical spectrum[D].Wuhan:Huazhong University of Science and Technology,2015.(in Chinese)陈宇晨.基于超高分辨率光谱的周期性信号相对相位测量方法研究[D].武汉:华中科技大学,2015.
[6]Coddington I,Swann W C,Newbury N R.Coherent multiheterodyne spectroscopy using stabilized optical frequency combs[J].Physical Review Letters,2008,100(1):013902.
[7]Dai Yonghong,Liu Yanfei,Zhou Haotian,et al.Sensitivity testing and experiment of balanced photodetectors in the space coherent optical communication[J].Infrared and Laser Engineering,2015,44(10):3110-3116.(in Chinese)代永红,刘彦飞,周浩天,等.空间相干光通信中平衡探测器灵敏度测试实验[J].红外与激光工程,2015,44(10):3110-3116.
[8]Chen Mu,Ke Xizheng.Power spectrum performance and bit error rate of mixed noise in QPSK modulated optical communication[J].Infrared and Laser Engineering,2017,46(10):1022005.(in Chinese)陈牧,柯熙政.QPSK调制光通信中混合噪声的功率谱性能与误码率[J].红外与激光工程,2017,46(10):1022005.
[9]Xue Shuhao,Chen Xue,Liu Wentao.A novel carrier phase recovery for optical coherent receivers with 16 QAMmodulation format[C]//ICMMCT,2016:194-198.
[10]Rejoy Isaac.High resolution optical coherent-channel analyzer using balanced-coherent detection and temperaturetuned DFB laser as local oscillator[D].Victoria:University of Victoria,2008.
[11]Yohei Sakamaki,Yusuke Nasu,Toshikazu Hashimoto,et al.Reduction of phase-difference deviation in 90°optical hybrid over wide wavelength range[J].IEICE Electronics Express,2010,7(3):216-221.
[12]Yu Jun,Huang Mingliu,Zou Yaozhao,et al.Phase noise cancellation for coherent optical OFDM system based on polarization diversity[J].Acta Optica Sinica,2016,36(8):0806001.(in Chinese)余骏,黄鸣柳,邹垚昭,等.偏振分集相干光OFDM通信系统中的相位噪声消除[J].光学学报,2016,36(8):0806001.
[13]Jiang Xuelin.The study of ultra-high resolution coherent spectral analysis system based on heterodyne interference[D].Harbin:Harbin Institute of Technology,2016.(in Chinese)姜雪林.基于外差干涉的超高分辨力相干光谱分析系统研究[D].哈尔滨:哈尔滨工业大学,2016.
[14]Tian Haiting,Zhang Chunxi,Jin Jing,et al.Effect of modulation frequency jitter on coherent detection and its elimination algorithm[J].Optics and Precision Engineering,2007,15(4):604-610.
[15]Li Jing,Zhang Wen,Miao Wei,et al.Development of ultra high sensitivity superconducting THz detectors[J].Chinese Optics,2017,10(1):122-130.(in Chinese)李婧,张文,缪巍,等.超高灵敏度太赫兹超导探测技术发展[J].中国光学,2017,10(1):122-130.