Fabrication of long-period gratings with a mercury-arc lamp

Jiang, Yi; Tang, Caijie; Xu, Jingjing

doi:10.1016/j.optcom.2009.11.061

Cited by 5 publications

(4 citation statements)

References 19 publications

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“…27) A mercury arc lamp has also been reported as a writing source of LPGs. 28) The electric power dissipation of the present authors' lamp was as low as 5 W, which is more than two orders of magnitude lower than that of a mercury arc lamp. An LPG with a high coupling loss exceeding 18 dB was obtained.…”

Section: Introductionmentioning

confidence: 54%

Fabrication of long-period fiber gratings using low-pressure mercury lamp: Shortening of exposure time

Mizunami

Fujiyoshi

2014

Jpn. J. Appl. Phys.

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The crystallization, microstructure, and soft magnetic properties of Fe 52 Co 34 Hf 7 B 6 Cu 1 alloy are studied. Amorphous Fe 52 Co 34 Hf 7 B 6 Cu 1 alloys are first treated by a pulsed magnetic field with a medium frequency, and then annealed at 100 • C-400 • C for 30 min in a vacuum. The rise in temperature during the treatment by a pulsed magnetic field is measured by a non-contact infrared thermometer. The soft magnetic properties of specimens are measured by a vibrating sample magnetometer (VSM). The microstructure changes of specimens are observed by a Mössbauer spectroscopy and transmission electron microscope (TEM). The results show the medium-frequency pulsating magnetic field will promote nanocrystallization of the amorphous alloy with a lower temperature rise. The nanocrystalline phase is α-Fe(Co) with bcc crystal structure, and the grain size is about 10 nm. After vacuum annealing at 100 • C for 30 min, scattering nanocrystalline phases become more uniform, the coercive force and the saturation magnetization of the specimens are 41.98 A/m and 185.15 emu/g.

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Section: Introductionmentioning

confidence: 54%

Fabrication of long-period fiber gratings using low-pressure mercury lamp: Shortening of exposure time

Mizunami

Fujiyoshi

2014

Jpn. J. Appl. Phys.

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“…Generally, a UV laser is used as the writing light source to write fiber gratings. However, we built up a different system to write LPGs, which uses a broadband UV lamp as the writing light source [8]. The LPG writing system is shown in Figure 1.…”

Section: Fabrication Of Cladding Lpgmentioning

confidence: 99%

A long‐period grating written in the cladding of an optical fiber

Jiang

2011

Micro & Optical Tech Letters

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The antenna mode was then calculated by subtracting the structural mode from the backscattering of the shorted tag antenna [3]. As expected, the structural mode exhibited reversed polarization (close to AR ¼ À1) near 910 MHz, while the antenna mode showed the same polarization (close to AR ¼ 1) as the incident field. This result demonstrated that polarization mismatch did not occur between the CP tag and the reader antenna, and that the CP tag produced an increased reading range [4]. CONCLUSIONSWe have developed a miniaturised CP tag antenna without compromising its reading range. The antenna had 3-dB bandwidth of 896-918 MHz even though its size was 33 mm Â 33 mm Â 4 mm. The maximum reading range was 7 m, which was twice that of the same size of LP tag. REFERENCES 1. J.-Y. Park and J.-M. Woo, Miniaturized dual-band S-shaped RFID tag antenna mountable on metallic surface, Electron Lett 44 (2008), 1339-1341. 2. S.-L. Chen, A miniature RFID tag antenna design for metallic objects application,ABSTRACT: A long-period grating (LPG) written in the cladding of an optical fiber is demonstrated. The optical fiber is specially designed and manufactured, which cladding is photosensitive, and core is not . The cladding LPG is written in by illuminating a cladding photosensitive fiber with an UV lamp through an amplitude grating mask. The cladding LPG is compared with a core LPG manufactured in the same way, and the property of the cladding LPG is different from that of the core LPG.

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“…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%

“…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%

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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Fabrication of long-period gratings with a mercury-arc lamp

Cited by 5 publications

References 19 publications

Fabrication of long-period fiber gratings using low-pressure mercury lamp: Shortening of exposure time

Fabrication of long-period fiber gratings using low-pressure mercury lamp: Shortening of exposure time

A long‐period grating written in the cladding of an optical fiber

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

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