研究目的
Investigating the use of an off-axis fiber Bragg grating (FBG) inscribed in a few-mode fiber (FMF) for orientation-dependent bend and temperature measurement.
研究成果
The off-axis FMF-FBG sensor demonstrated effective orientation-dependent bend and temperature measurement capabilities, utilizing the unique properties of the LP01-11 mode for intensity-based bend sensing and wavelength-based temperature sensing.
研究不足
The sensor's performance may be affected by the precision of the FBG inscription process and the alignment of the fiber during bend measurement.
1：Experimental Design and Method Selection:
The FBG was inscribed in a FMF using a femtosecond laser and phase mask technique to create an off-axis FBG for bend and temperature sensing.
2：Sample Selection and Data Sources:
A two-mode fiber produced by YOFC was used, with specific dimensions and refractive index profile.
3：List of Experimental Equipment and Materials:
A Ti: sapphire laser system for FBG inscription, a phase mask, and an optical spectrum analyzer (OSA) for monitoring the reflection spectrum.
4：Experimental Procedures and Operational Workflow:
The FBG was inscribed with specific laser parameters, and the sensor's response to bend and temperature was measured.
5：Data Analysis Methods:
The intensity of the LP01-11 mode was used for bend measurement, and the wavelength shift was used for temperature measurement.
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