Paper Info
Title
Fiber Bragg Grating With Enhanced Cladding Modes Inscribed By Femtosecond Laser And A Phase Mask
Abstract
In this paper, we demonstrate a fiber Bragg grating (FBG) with a wide range and a comb with continuous cladding mode resonances inscribed in non-photosensitive single mode fibers using a femtosecond laser and a phase mask. The FBG is inscribed in the core and cladding, exciting a series of cladding modes in transmission. The birefringence induced by this FBG structure offers significant polarization-dependence for cladding modes, thus allowing the vector fiber twist to be perceived. By measuring the peak-to-peak differential intensity of orthogonally polarized cladding mode resonances, the proposed sensor presents totally opposite intensity response in the anticlockwise direction for the torsion angle ranging from -45 degrees to 45 degrees. The cladding mode comb approximately covers wavelengths over the O-, E-, S-, and C-bands in transmission. The cutoff cladding mode of air can be observed in the spectrum. Thus, the sensible refractive index range is estimated to be from 1.00 to 1.44. Temperature responsivity of the grating is also characterized. The proposed device potentially provides new solutions to the various challenges of physical vector and bio-chemical parameters sensing.
Year
DOI
Venue
2020
10.3390/s20247004
SENSORS
Keywords
DocType
Volume
fiber Bragg grating (FBG), fiber cladding mode, femtosecond laser inscription
Journal
20
Issue
ISSN
Citations 
24
1424-8220
0
PageRank 
References 
Authors
0.34
0
4
Name
Order
Citations
PageRank
Weijia Bao100.34
Shen Liu202.03
Wenjie Feng34512.75
Yiping Wang402.03