期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 23, 页码 7539-7544出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3116206
关键词
Optical fibers; Optical fiber sensors; Fiber lasers; Fiber gratings; Reflection; Optical fiber polarization; Sensors; Cladding components; femtosecond laser inscription; fiber Bragg grating; fiber optics sensors; integrated optics devices
资金
- National Natural Science Foundation of China [61735014, 61927812, 62075181]
Femtosecond laser point-by-point technology allows direct writing of FBGs into the cladding of optical fibers, creating CLFBGs with characteristics similar to conventional core-based FBGs. These compact CLFBGs, with low insertion loss, have application value in the fields of optical fiber sensors, communications, and lasers, particularly for manufacturing vector sensing devices.
Femtosecond laser point-by-point (PbP) technology can be used as a direct writing method to inscribe fiber Bragg gratings (FBGs) into the cladding of optical fibers. When the refractive index modulated area of cladding FBGs (CLFBGs) is close to the core-cladding interface, the CLFBGs exhibit characteristics similar to conventional core-based FBGs. When bending was applied, the reflected power of the CLFBGs changed significantly and showed an orientation dependence on the fiber bending direction. The CLFBG inscription method provides a new opportunity to fabricate vector sensing devices, which can be realized by parallelly inscribed multiple CLFBGs. Compact CLFBGS with a low insertion loss (less than 0.05 dB) have application value in the fields of optical fiber sensors, communications, and lasers.
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