Mechanism and characteristics of asymmetrically phase-shifted corrugated long-period fiber grating fabricated by burning fiber coating and etching cladding technology

Wang, Li; Zhang, Weigang; Liu, Fang; Chen, Lei; Cui, Zhiquan; Yan, Tieyi

doi:10.1080/09500340.2014.992993

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…A conventional LPFG can be simply fabricated by exposing single-mode fibers (SMFs) with a germanium-doped core to UV excimer lasers and frequency-doubled argon lasers [1]. For specialty fibers without photosensitivity, such as photonic crystal fibers (PCFs), different fabrication techniques are required to generate the periodic index modulation for the realization of LPFGs [2,[6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The etching method to induce the periodic deformation of the silica cladding in the dispersion-shifted fiber (DSF) was proposed by using a hydrofluoric acid (HF) solution incorporating the metal coating procedure [16].…”

Section: Introductionmentioning

confidence: 99%

“…Cladding modes play an important role in realizing fiber-optic sensors based on LPFGs with high sensitivity to external perturbation change, such as temperature and strain [1][2][3]. There is much research on the development of fabrication techniques of LPFGs [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. A conventional LPFG can be simply fabricated by exposing single-mode fibers (SMFs) with a germanium-doped core to UV excimer lasers and frequency-doubled argon lasers [1].…”

Section: Introductionmentioning

confidence: 99%

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Transmission Characteristics of Long-Period Fiber Gratings Using Periodically Corroded Single-Mode Fibers

Lee

Bang

Han

2015

Journal of the Optical Society of Korea

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Transmission characteristics of long-period fiber gratings (LPFGs) fabricated by periodically etching a conventional single-mode fiber (SMF) are investigated. After coating the SMF with photoresist, the cladding of the SMF is symmetrically and periodically removed by using a wet etching technique resulting in the formation of the LPFG. Tensile strain reinforces the coupling strength between the core and the cladding mode based on the photoelastic effect. The extinction ratio of the SMF-based LPFG at a wavelength of 1550.8 nm is measured to be -15.1 dB when the applied strain is 600 µε . The ascent of ambient index shifts the resonant wavelength to shorter wavelength because of the increase of the effective refractive index of the cladding mode. The extinction ratio is diminished by increase in the ambient index because of the induction of the optical attenuation of the cladding mode. The transmission characteristics of the proposed LPFG with variations in torsion are also measured. The photoelastic effect based on torsion changes the extinction ratio and the resonant wavelength of the proposed SMF-based LPFG. The polarization-dependent loss of the LPFG is also increased by torsion because of the torsion-induced birefringence. The polarization-dependent loss of the LPFG at torsion of 8.5 rad/m is measured to be 3.9 dB.

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