The study of second-order coupling of cladding modes of helical long-period gratings inscribed by commercial welding machine

Bai, Yunfeng; He, Zelong; Bai, Jiyuan; Dang, Suihu

doi:10.1007/s00340-021-07583-z

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…CO 2 激光 >1 dB [18] <1 dB [19] 优点: 灵活、高品质; 缺点: 光路调试麻烦、昂贵氢氧火焰 <1 dB [33] ≈ 1 dB [34] 优点: 加热面积较宽, 加热温度均匀; 缺点: 氢气有一定危险性二电极电弧放电 >1 dB [25] >1 dB [27] 优点…”

Section: 结构制备方法透射光谱的最小损耗说明单模光纤螺旋长周期光纤光栅unclassified

Properties of off-axis helical long-period fiber gratings

Wang¹,

Ma²,

Wang³

et al. 2023

Acta Phys. Sin.

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In this paper, a new four-electrode arc discharge machining device with large constant temperature region is designed for fabricating high quality off-axis helical long-period fiber Bragg grating. The larger constant temperature heating area is more conducive to releasing the stress of optical fiber, so that the prepared device is less off-axis. In order to show that low off-axis is the key parameter of high quality off-axis helical long-period fiber Bragg grating, the effects of single mode fiber on transmission spectrum of off-axis helical long-period fiber Bragg grating under different coupling length, pitch, core refractive index, cladding refractive index, core diameter, cladding diameter and off-axis quantity are simulated by using beam propagation method. Since traditional methods are difficult to measure the off-axis helical long-period fiber Bragg grating with small off-axis quantity, this paper estimates the off-axis quantity of the prepared device by using the method of spectral comparison and back-thrust off-axis quantity. The off-axis helical long-period fiber grating was prepared by the established processing device. The off-axis quantities of the prepared devices were about 0.12µm, 0.13µm and 0.16µm, respectively, according to the comparison between the simulated transmission spectrum and the actual spectrum.Finally, experiments on the torsional resistance and repeatability of the off-axis helical long-period fiber Bragg grating prepared by the device are carried out. The experiments show that the prepared Bragg grating has certain torsional resistance and good spectral repeatability.

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Section: 结构制备方法透射光谱的最小损耗说明单模光纤螺旋长周期光纤光栅unclassified

Properties of off-axis helical long-period fiber gratings

Wang¹,

Ma²,

Wang³

et al. 2023

Acta Phys. Sin.

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“…The hydrogen–oxygen generator is prone to producing redundant flammable and explosive gases while electrolyzing water. It is worth mentioning that the arc-discharge heating system is often used to prepare HLPGs because of its simplicity and security [ 30 , 31 , 32 , 33 ]. Unfortunately, the performance of this system is insufficient in terms of stability and repeatability, and it is difficult to achieve high-quality HLPG preparation [ 31 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of High-Sensitivity Optical Fiber Sensor by an Improved Arc-Discharge Heating System

Wang

Yuan

2023

Sensors

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We proposed a high-sensitivity optical fiber sensor based on a dual-resonance helical long-period fiber grating (HLPG). The grating is fabricated in a single-mode fiber (SMF) by using an improved arc-discharge heating system. The transmission spectra and the dual-resonance characteristics of the SMF-HLPG near the dispersion turning point (DTP) were studied through simulation. In the experiment, a four-electrode arc-discharge heating system was developed. The system can keep the surface temperature of optical fiber relatively constant during the grating preparation process, which shows an advantage in preparing high-quality triple- and single-helix HLPGs. In particular, benefiting from this manufacturing system, the SMF-HLPG operating near the DTP was successfully prepared directly by arc-discharge technology, without secondary processing of the grating. As a typical application example of the proposed SMF-HLPG, physical parameters such as temperature, torsion, curvature and strain can be measured with high sensitivity by monitoring the variation of the wavelength separation in the transmission spectrum. Therefore, the proposed sensor and its fabrication technology have potential application prospects in practical sensing measurement.

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