A micro Fabry-Perot interferometer (M-FPI) is constructed by splicing a short section of polarization-maintaining photonic crystal fiber (PM-PCF) to an end-cleaved single-mode fiber with controllable offset. Due to the high effective optical path difference induced by the solid core of the PCF, the M-FPI has an ultrasmall cavity of approximately 110 μm. The temperature sensitivity within a range from 33 °C to approximately 600 °C is measured to be 13.8 pm/°C, which shows good agreement with the theoretical result. This proposed sensor has the advantages of ultracompact size and high stability. Therefore, it is suitable for various space-limited sensing applications in harsh environments.
© 2012 Chinese Optics Letters
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2430) Fiber optics and optical communications : Fibers, single-mode
Fiber Optics and Optical Communications
Jing Zhang, Hao Sun, Qiangzhou Rong, Yue Ma, Lei Liang, Qinfang Xu, Pei Zhao, Zhongyao Feng, Manli Hu, and Xueguang Qiao, "High-temperature sensor using a Fabry-Perot interferometer based on solid-core photonic crystal fiber," Chin. Opt. Lett. 10, 070607-070607 (2012)