研究目的
To investigate the characteristics of the CO2-induced LPFGs based on the DCF in the 2 μm waveband and compare the difference between 1.55 and 2 μm resonant wavelength.
研究成果
The 2 μm resonant wavelength has higher sensing characteristics than the 1.55 μm resonant wavelength, with a temperature sensitivity of 0.110 nm/oC and a torsion sensitivity of -0.243 nm/(rad/m). The tunable rejection filter based on DCF-LPFGs in mid-infrared waveband can be applied to optical communication or fiber laser sources.
研究不足
The study is limited to the fabrication and sensing characteristics of LPFGs in the 2 μm waveband, with comparisons made to the 1.55 μm waveband. Potential areas for optimization include the sensitivity and tunability of the LPFGs for broader applications.
1：Experimental Design and Method Selection:
The fabrication of LPFGs in double cladding fiber using a CO2 laser, with the transmission spectra dynamically monitored by a broadband light source and an optical spectrum analyzer.
2：Sample Selection and Data Sources:
Double cladding fiber with specific dimensions was used.
3：List of Experimental Equipment and Materials:
CO2 laser (Han’ laser CO2-H10), a three-dimensional (3D) translation stage, a broadband light source (BBS, SuperK, NKT Photonics), and an optical spectrum analyzer (OSA, AQ6375, YOKOGAWA).
4：Experimental Procedures and Operational Workflow:
The CO2 laser was used to fabricate LPFGs with varying periods, and the transmission spectra were monitored.
5：Data Analysis Methods:
The relationship between resonant wavelength and period was analyzed, and temperature and torsion sensitivities were measured.
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