研究目的
Investigating the fabrication and sensing characteristics of helical long-period gratings (HLPGs) inscribed in polarization-maintaining fibers (PMFs) using CO2-laser.
研究成果
The HLPGs inscribed in PMFs using CO2-laser exhibit high polarization dependent loss, refractive index sensitivity, temperature sensitivity, strain sensitivity, and twist sensitivity, making them promising for applications in high-sensitivity fiber sensors and PDL compensators.
研究不足
The study focuses on the fabrication and characterization of HLPGs in PMFs using CO2-laser, but does not explore the long-term stability or environmental robustness of these gratings.
1：Experimental Design and Method Selection
The study involves the fabrication of HLPGs in PMFs using CO2-laser irradiation, with a focus on the grating's polarization, refractive index, temperature, strain, and twist characteristics.
2：Sample Selection and Data Sources
Commercial PMF (PM 1550 125/13, YOFC) with a nominal beat length of < 5 mm was used. The transmission spectrum of the grating was monitored using a broadband light source and an optical spectrum analyzer.
3：List of Experimental Equipment and Materials
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4：Experimental Procedures and Operational Workflow
The PMF was rotated during CO2-laser irradiation to induce helical refractive index modulation. The grating's characteristics were then measured under various conditions (temperature, strain, twist).
5：Data Analysis Methods
The study analyzed the grating's transmission spectra, polarization dependent loss, and sensitivity to refractive index, temperature, strain, and twist.
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Broadband light source
SuperK
NKT Photonics
Used as a light source for monitoring the transmission spectrum.
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Optical spectrum analyzer
AQ6375
YOKOGAWA
Used to analyze the transmission spectrum.
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PMF
PM 1550 125/13
YOFC
Used as the substrate for inscribing HLPGs.
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CO2-laser
CO2-H10
Han’s Laser
Used for inscribing HLPGs in PMFs.
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