高速大容量光纤光栅解调仪的研究
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摘要
采用半导体光放大器和可调谐法布里-珀罗滤波器,以环路结构组成高速扫描激光器,结合光耦合器、光环路器和光电二极管等,形成4通道大容量高速光纤光栅解调仪。系统采用2kHz的类三角波调制信号,驱动法布里-珀罗滤波器在50nm的光谱范围内进行快速扫描。通过引入光纤梳状滤波器和单峰滤波器组成的参考通路,消除法布里-珀罗滤波器的非线性效应和扫描波长漂移问题,使得解调仪具有很好的稳定性和线性度。高速光纤光栅解调仪的稳定性为2pm,分辨率为1pm,线性度为0.99957,测量精度为5pm,解调频率为2kHz。
A four-channel large-capacity,high-speed fiber Bragg grating demodulator is proposed.It constitutes of semiconductor optical amplifier and tunable Fabry-Pérot filter which is composed a high-speed scan laser in a loop structure,combining the optical coupler,optical loop circuit and photodiode.A 2 kHz triangular-like modulation signal is used in this system to drive the Fabry-Pérot filter to make fast scan in the range of 50 nm.The nonlinear effect and scan wavelength shift can be eliminated in Fabry-Pérot filter by introducing the reference channel composed by optical fiber comb filter and single-peak filter,leading to the excellent stability and linearity of demodulator.The stability of high-speed fiber Bragg grating demodulator is 2 pm;the resolution is 1 pm;the linearity is 0.99957;the measuring accuracy is 5 pm,the demodulation frequency is 2 kHz.
A four-channel large-capacity,high-speed fiber Bragg grating demodulator is proposed.It constitutes of semiconductor optical amplifier and tunable Fabry-Pérot filter which is composed a high-speed scan laser in a loop structure,combining the optical coupler,optical loop circuit and photodiode.A 2 kHz triangular-like modulation signal is used in this system to drive the Fabry-Pérot filter to make fast scan in the range of 50 nm.The nonlinear effect and scan wavelength shift can be eliminated in Fabry-Pérot filter by introducing the reference channel composed by optical fiber comb filter and single-peak filter,leading to the excellent stability and linearity of demodulator.The stability of high-speed fiber Bragg grating demodulator is 2 pm;the resolution is 1 pm;the linearity is 0.99957;the measuring accuracy is 5 pm,the demodulation frequency is 2 kHz.
引文
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2Y.Zou,X.Dong.Demodulation of the FBG temperature sensorwith the tunable twin-core fiber[J].Microwave&Opt.Technol.Lett.,2011,53(1):81～84
3Ni Kai,Xu Haisong,Dong Xinyong et al..Temperatureindependent fiber Bragg grating tilt sensor[J].Acta OpticaSinica,2010,30(7):2104～2107倪凯,徐海松,董新永等.基于光纤布拉格光栅的温度不敏感的倾斜传感器[J].光学学报,2010,30(7):2104～2107
4Wu Yonghong,Shao Changjiang,Qu Wenjun et al..Simplifiedtime dependant optical mechanical transformation equation forFBG strain sensors[J].Acta Optica Sinica,2010,30(7):1965～1970吴永红,邵长江,屈文俊等.简化的光纤光栅应变传感器光-力转换的时变方程[J].光学学报,2010,30(7):1965～1970
5W.Wang,N.Wu,Y.Tian et al..Optical pressure/acousticsensor with precise Fabry-Perot cavity length control using anglepolished fiber[J].Opt.Express,2009,17(19):16613～16618
6Qiao Xueguang,Ding Feng,Jia Zhenet al..High precision opticalfiber Bragg grating demodulation system based on the sourcefiltering for seismic detection[J].Acta Optica Sinica,2010,30(8):2219～2223乔学光,丁锋,贾振安等.基于光源滤波的高精度光纤光栅地震检波解调系统[J].光学学报,2010,30(8):2219～2223
7L.A.Ferreira,J.L.Santes,F.Farah et al..Pseudoheterodyne demodulation technique for fiber Bragg gratingsensors using two matched gratings[J].IEEE Photon.Technol.Lett.,1997,9(4):487～489
8Chen Xian,Yu Shangjiang,Yang Jixiang et al..Measurementefficiency of high speed demodulation by linear filtering method[J].Acta Optica Sinica,2009,29(1):145～150陈显,余尚江,杨吉祥等.线性滤波法高速解调技术中的测量有效性研究[J].光学学报,2009,29(1):145～150
9Zhang Jinlong,Yu Chongxiu,Wang Kuiru et al..Fiber gratingsensor demodulation method based on polarization interference[J].Acta Physica Sinica,2009,58(6):3988～3994张锦龙,余重秀,王葵如等.基于偏振干涉的光纤光栅传感解调方法[J].物理学报,2009,58(6):3988～3994
10H.Gao,S.Yuan,L.Bo et al..InGaAs spectrometer and F-Pfilter combined FBG sensing multiplexing technique[J].J.Lightwave Technol.,2008,26(14):2282～2285
11Liang Xiao,Liu Tiegen,Liu Kun et al..Method of real-timecalibration for tunable optical filter nonlinearity[J].Chinese J.Lasers,2010,37(6):1445～1449梁霄,刘铁根,刘琨等.一种可调谐光滤波器非线性实时标定方法研究[J].中国激光,2010,37(6):1445～1449
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