改进的锯齿形光谱滤波器
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摘要
锯齿形光谱(JAWS)滤波器的光谱成分比较复杂,是一种较难实现的光谱滤波器。本文通过数值仿真对基于虚像相位阵列(VIPA)的JAWS滤波器的主要参数如线性度、占空比和信噪比(SNR)等进行了优化,并进行了实验验证;通过对JAWS滤波器插损的分析,将反射式的工作方式改变为透射式的工作方式,使整个滤波器的附加损耗从20dB减小到小于6dB;同时,滤波器的性能也有了明显的进步。
Jammed-array wideband sawtooth(JAWS)filter has periodic multi-channel sawtooth spectrum.Due to the complex spectral components,it′s difficult to make a passive multi-channel sawtooth filter.In this article,we present a modified JAWS filter with low loss.It only consists of four elements,including a fiber collimator,two lenses and a virtually-imaged phased array(VIPA).The beam transmitted through the VIPA is collected by a lens and a large area photodetector rather than a mirror is used to reflect the beam back into the fiber.The extra insertion loss is lower than 6dB and the performance of the filter is much better than that of the JAWS filter with beam reflected by a mirror.The main characteristics of the jammed-array wideband sawtooth filter based on a virtually-imaged phased array are studied systematically.The main parameters,such as linearity,duty cycle and signal-to-noise ratio,are optimized by numerical simulation and tested by the experiment.Since the free spectrum range of the filter is decided by the thickness of VIPA,the optimization of VIPA with different thicknesses is also discussed.The filter might be used in fast sensitive interrogation of concatenated multi-channel fiber Bragg grating sensors and ultra-high-frequency electrical sawtooth waveform generation.
Jammed-array wideband sawtooth(JAWS)filter has periodic multi-channel sawtooth spectrum.Due to the complex spectral components,it′s difficult to make a passive multi-channel sawtooth filter.In this article,we present a modified JAWS filter with low loss.It only consists of four elements,including a fiber collimator,two lenses and a virtually-imaged phased array(VIPA).The beam transmitted through the VIPA is collected by a lens and a large area photodetector rather than a mirror is used to reflect the beam back into the fiber.The extra insertion loss is lower than 6dB and the performance of the filter is much better than that of the JAWS filter with beam reflected by a mirror.The main characteristics of the jammed-array wideband sawtooth filter based on a virtually-imaged phased array are studied systematically.The main parameters,such as linearity,duty cycle and signal-to-noise ratio,are optimized by numerical simulation and tested by the experiment.Since the free spectrum range of the filter is decided by the thickness of VIPA,the optimization of VIPA with different thicknesses is also discussed.The filter might be used in fast sensitive interrogation of concatenated multi-channel fiber Bragg grating sensors and ultra-high-frequency electrical sawtooth waveform generation.
引文
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[2]JIA Zhen-an,LIU Jing,QIAO Xue-guang,et al.A demodulation technology based on digital tunable F-P filter for fiber Bragg grating sensing signals[J].Journal of Optoelectronics·Laser,2011,22(5):649-651.贾振安,刘静,乔学光,等.FBG传感信号数字化可调谐F-P滤波器解调技术研究[J].光电子·激光,2011,22(5):649-651.
[3]WANG Yan,LIANG Da-kai,LI Dan,et al.Embedded longperiod fiber grating sensors for monitoring the steel corrosion in reinforced concrete structures[J].Journal of Optoelectronics·Laser,2012,23(8):1539-1544.王彦,梁大开,李丹,等.混凝土中基于预埋式LPFG波长解调的耐久性健康监测[J].光电子·激光,2012,23(8):1539-1544.
[4]TAN Zhong-wei,WANG Chao,Goda Keisuke,et al.Jammed-array wideband sawtooth filter[J].Optics Express,2011,19(24):24563-24568.
[5]TAN Zhong-wei,WANG Chao,Goda Keisuke,et al.Alloptical passive periodic sawtooth filter and its application to fast interrogation of fiber Bragg grating sensor array[A].Optical Fiber Communication Conference and Exposition(OFC/NFOEC)[C].2012,4:1-3.
[6]Jalali B,Kelkar P V,Saxena V.Photonic arbitrary waveform generator[J].Proceedings of the Lasers and Electro-Optics Society,2001,1:253-254.
[7]Baskar S,Suganthan P N,Ngo N Q,et al.Design of triangular FBG filter for sensor applications using covariance matrix adapted evolution algorithm[J].Optics Communications,2006,260(2):716-722.
[8]Bandyopadhyay S,Biswas P,Pal A,et al.Empirical relations for design of linear edge filters using apodized linearly chirped fiber Bragg grating[J].Journal of Lightwave Technology,2008,26(24):3853-3859.
[9]ZHOU Rui,QIAO Xue-guang,WANG Ruo-hui,et al.Seismic wave interrogation system based on the linear edge filter chracteristics of long period fiber grating[J].Journal of Optoelectronics·Laser,2011,22(7):987-991.周锐,乔学光,王若晖,等.基于长周期光纤光栅线性边缘滤波的地震波解调系统[J].光电子·激光,2011,22(7):987-991.
[10]Mohammed W S,Smith P W E,Gu X.All-fibre multimode interference bandpass filter[J].Opt.Lett.,2006,31:2547-2549.
[11]Rao Y J,Cooper M R,Jackson D A,et al.Absolute strain measurement using an in-fibre-Bragg-grating-based Fabry-Perot sensor[J].Electron.Lett.,2000,36(8):708-709.
[12]Shirasaki M.Large angular dispersion by a virtually imaged phased array and its application to a wavelength demultiplexer[J].Optics Letters,1996,21(5):366-368.
[13]Xiao S J,Weiner A M,Lin C.A dispersion law for virtually imaged phased-array spectral dispersers based on paraxial wave theory[J].IEEE J Quantum Elect,2004,40(4):420-426.
[14]Tsia K K,Goda K,Capewell D,et al.Performance of serial time-encoded amplified microscope[J].Opt.Express,2010,18(10):10016-10028.
[15]Goda K,Tsia K K,Jalali B.Serial time-encoded amplified imaging for real-time observation of fast dynamic phenomena[J].Nature,2009,458:1145-1149.
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