研究目的
Investigating the fabrication of helical long-period fiber grating in a six-mode fiber with CO2 laser for mode conversion from LP01 mode to LP21 mode and studying its sensing characteristics.
研究成果
The HLPG in a six-mode fiber successfully realized mode conversion from LP01 mode to LP21 mode with high efficiency. The sensing characteristics, including sensitivity to torsion, temperature, and bending, were experimentally investigated, showing potential for applications in mode division multiplexing systems.
研究不足
The study is limited to the fabrication and characterization of HLPG in a six-mode fiber. The sensitivity to torsion, temperature, and bending was investigated, but other potential applications or effects were not explored.
1：Experimental Design and Method Selection:
The HLPG was fabricated by helical index modulation with a CO2 laser. The fiber was rotated and moved simultaneously with a constant speed along the fiber axis.
2：Sample Selection and Data Sources:
A six-mode fiber was used, spliced with a SMF at both ends.
3：List of Experimental Equipment and Materials:
CO2 laser (CO2-H10, Han’s Laser), broadband light source (ASLD-CWDM-5-B-FA, Amonics), optical spectrum analyzer (OSA, AQ6375, YOKOGAWA), tunable laser (81600B, Agilent), CCD (InGaAs, Model C10633-23, Hamamtsu Photonics).
4：Experimental Procedures and Operational Workflow:
The CO2 laser irradiated the fiber while it was rotated and moved. The transmission spectra were monitored by an OSA.
5：Data Analysis Methods:
The mode pattern of the HLPG was observed using a tunable laser and a CCD.
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optical spectrum analyzer
AQ6375
YOKOGAWA
Monitored the transmission spectra of the fiber grating.
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tunable laser
81600B
Agilent
Used to observe the mode pattern of the HLPG.
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CCD
C10633-23
Hamamtsu Photonics
Used to observe the mode pattern of the HLPG.
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broadband light source
ASLD-CWDM-5-B-FA
Amonics
Launched light into the six-mode fiber for monitoring transmission spectra.
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CO2 laser
CO2-H10
Han’s Laser
Used for helical index modulation in the fabrication of HLPG.
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