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Demodulation method for tilted fiber Bragg grating refractometer with high sensitivity
- Source :
- Journal of Applied Physics. 123:174501
- Publication Year :
- 2018
- Publisher :
- AIP Publishing, 2018.
-
Abstract
- In this paper, we propose a demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance “cut-off wavelengths.” The idea of a “cut-off wavelength” and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401–1.4570 RI range when our proposed demodulation method is used.In this paper, we propose a demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance “cut-off wavelengths.” The idea of a “cut-off wavelength” and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401–1.4570 RI range when our proposed demodulation method is used.
- Subjects :
- Materials science
business.industry
General Physics and Astronomy
02 engineering and technology
Laser
Cladding mode
01 natural sciences
law.invention
010309 optics
Core (optical fiber)
020210 optoelectronics & photonics
Optics
Refractometer
Fiber Bragg grating
law
0103 physical sciences
Femtosecond
0202 electrical engineering, electronic engineering, information engineering
Demodulation
business
Refractive index
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 123
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........c7ace99fbedc0be9f95f5bdcc5702899