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The changes in wavelength and attenuation of temperature-insensitive long period fiber grating subjected to bends with curvatures from 0 to 4.4 m-1 are examined. The wavelength change with curvature is nonlinear and the minimum detectable curvature change is 0.03 m-1. 相似文献
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1 Introduction Long periodfiber gratings (LPGs )recentlyattractedmuchattentionforuseinopticalsensingapplications[1,2 ] .Theyareusedassensingcomponentstomeasuretemperature ,strainandbendingoffiber .However ,minimizingthecrosstalkbetweendifferentmeasurands,espec… 相似文献
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高消光比双通马赫-曾德尔干涉仪梳状滤波器 总被引:4,自引:0,他引:4
提出了一种新颖结构的高消光比双通马赫-曾德尔干涉仪梳状滤波器,将常规单通马赫-曾德尔干涉仪的两个输出端与光隔离器连接,构成一个双通马赫-曾德尔干涉仪梳妆滤波器,对滤波器的输出特性进行了理论分析和实验研究。数值模拟表明,与常规的单通马赫-曾德尔干涉仪相比,在相同参量的情况下该双通马赫-曾德尔干涉仪梳妆滤器的消光比得到了大大改善,消光比的提高取决于干涉仪的臂长差,当干涉仪的臂长差为0.7366mm时,消光比提高了20dB。实验结果表明,双通马赫-曾德尔干涉仪梳妆滤器的消光比为25.8dB,消光比提高了13dB。 相似文献
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1 Introduction TheconventionalMach Zehnderinterferometerisanimportantdiagnostictool.Frequentlyusedinthefieldsofplasmaphysics,aerodynamics,andheattransferformeasuringdensity ,pressure ,andtemperaturechangesingases.Becauseofitsrelativelylargeandfreelyacces… 相似文献
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A novel structure of high extinction ratio multiplexer/demultiplexer with a Mach-Zehnder interferometer (MZI) and a fiber loop mirror (FLM) is proposed. The experimental results show that the extinction ratio can be enhanced about two times in comparison with the conventional MZI. 相似文献
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A technique for compensation of temperature effects in fiber grating sensors is reported. For strain sensors and other sensors related to strain such as electromagnetic sensors, a novel structure is designed, which uses two fiber Bragg gratings (FBGs) as strain differential sensor and has temperature effects cancelled. Using this technique, the stress sensitivity has been amplified and gets up to 0.226 nm/N, the total variation in wavelength difference within the range of 3-45 ℃ is 0.03 nm, 1/14 of the uncompensated FBG.The structure can be used in the temperature-insensitive static strain measurement and minor-vibration measurement. 相似文献
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The electric voltage tuning performance of an all-fiber Mach-Zehnder interferometer which has unequal arm-length is studied in this paper. This interferometer consists of two 3 dB fiber directional couplers, with one arm is affixed to a piezoelectric translators (PZT). When the voltage applied on the PZT changes, the output interferometric pattern will shift accordingly. The transmission period of the interferometer is 2.24 nm. When the direct current electric voltage changes from 28.7 volt to -28.7 volt, the pattern will shift for nearly one of its own period. The tuning sensitivity is about 0.038 nm/volt, and the linearity is 0.9991. Also, the relationship between the physical path length difference of the two arms and the interval of adjacent interferometric peaks is discussed. This component has potential important applications in electric sensing measurement and optical fiber communication field. 相似文献