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解 决 方 案

透射谱的峰值损耗Ar与NaCl溶液折射率之间成线性关系，可以 refractometer based upon a long period grating Mach-
得到折射率响应灵敏度为4.997dB/RIU(RIU为折射率单位)。因 Zehnder interferometer [J]. Review of Scientific
此，当环境折射率发生变化时，峰值损耗Ar发生线性变化，而 Instruments,2012,73( 4) : 1702-1705.
谐振中心波长λ1基本不变，故可以利用强度调制法对环境折射 [10] FRAZAO O,CALDAS P,SANTOS J L,et al. Fabry-Perot
率进行测量。 refractometer based on an end - of - biber polymer
tip[J]. Optics Letters,2009,34( 16) : 2474-2475.
三、结论 [11] DENG M,RAO Y J,ZHU T,et al. Refractive-index sen-sor
利用SMF-MMF-MCF-MMF-SMF熔接构成一款新颖的全光纤结构 based on photonic fiber Fabry-Perot interferometer with
的MZI光纤传感器。获得的传感器透射谱的峰值损耗对环境折射 self temperature compensation [J]. Acta Optica
率比较敏感，而谐振峰值中心波长(波谷)对环境折射率不太敏 Sinica,2009,29( 7) : 1790-1795.
感。因此利用强度调制法，能够实现对环境折射率的测量。通 [12] WANG Y,YANG M,WANG D N,et al. Fiber in - line Mach-
过实验测量，获得环境折射率的灵敏度为4.997dB/RIU。本文设 Zehnder interferometer fabricated by femtosecond la-
计的光纤折射率传感器与多芯光纤错位熔接构成的折射率传感 ser micromachining for refractive index measurement with
器相比，制作更容易，而且克服了光纤错位熔接易断的缺点， high sensitivity[J].Journal of the Optical Society of
同时具有结构紧凑、体积小、成本低、灵敏度较高等优点，在 America B,2010,27( 3) : 370-374.
食品工业、医学医疗、化学化工和生物工程等领域有广泛的应 13] LU P,MEN L,SOOLEY K,et al. Tapered fiber Mach-Ze-hnder
用前景。 interferometer for simultaneous measurement of refrac-
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