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wavelength and sensitivity tunable long period gratings fabricated in fluid-cladding microfibers

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Chinese Physics B 2022年第1期31卷 299-304页

作者： wa jin Linke Zhang Xiang Zhang Ming Xu Weihong Bi Yuefeng Qi Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Qin Huangdao 066004China School of Information Science and Engineering Yanshan UniversityQin Huangdao 066004China

We report the fabrication of long period gratings in fluid-cladding microfibers by directly focusing a femtosecond laser beam on the microfibers surface to induce periodical modification a long one side of the microfibers.A long period grating is fabricated in a water-cladding microfiber with a diameter of~5μm,which demonstrates a resonant attenuation of 28.53 dB at wavelength of 1588.1 nm with 10 *** water cladding is changed to be refractive index oil of n=1.33 and alcohol solution with concentration of 5%,the resonance wavelength shifts to 1575.1 nm with resonant attenuation of 24.91 dB and 1594.1 nm with resonant attenuation of 35.9 dB,*** long period grating demonstrates different temperature sensitivities of-0.524 nm/℃,-0.767 nm/℃and-1.316 nm/℃for water,alcohol solution and refractive index oil cladding microfibers,respectively,which means the alterable liquid cladding allows the availability of tunable wavelength and *** fluid-cladding protects the microfibers from external disturbance and contamination and allows more flexibility in controlling the transmission property and sensing characteristics of long period gratings,which can be used as fiber devices and sensors for chemical,biological,and environmental applications.

关键词： fluid-cladding microfiber long-period grating temperature

Study on polarization properties of graphene coated D-shaped fiber

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Chinese Physics B 2018年第10期27卷 346-351页

作者： Xuejing Liu Luwen Yang jingyun Ma Caili Li wa jin Weihong Bi School of Instrumentation Science and Opto-electronics Engineering Beihang UniversityBeijing 100191China School of Information Science and Engineering Key Laboratory for Special Fiber and Fiber Sensor of Hebei ProvinceYanshan UniversityQinhuangdao 066004China Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province School of Information Science and EngineeringQinhuangdao 066004China

The optical properties of graphene coated D-shaped single mode fiber and photonic crystal fiber are numerically analyzed. Enhancement of the graphene-light interaction is found in graphene coated D-shaped photonic crystal fiber,which introduces a tunable polarization of the D-shaped fiber by changing the chemical potential of the coated *** optimal polarizer model is demonstrated with the extinction ratio of 66.26 dB/mm and the insertion loss of 9.4 dB/*** modulator extinction ratios of the TE mode and TM mode are 11.5 dB and 5 dB, respectively, with a device length of100 μm. This paper provides a theoretical reference for the optical property research of the graphene fiber.

关键词： photonic crystal fiber graphene polarization chemical potential

A robust salinity sensor based on encapsulated long-period grating in microfiber

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Optoelectronics Letters 2020年第6期16卷 418-422页

作者： WU Shu-hui jin wa BI Wei-hong LI Xia ZHANG Lin-ke jin Yun Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province School of Information Science and EngineeringYanshan UniversityQinhuangdao 066004China Department of Mechanical and Electrical Engineering Hebei Construction Material Vocational and Technical CollegeQinhuangdao 066004China

A robust fiber sensor for salinity measurement based on encapsulated long-period grating in microfiber is proposed. The long-period grating is fabricated in microfiber by inducing periodical deformation with CO2 laser, which is then encapsulated in a holey capillary tube. The encapsulation tube is designed to effectively protect the microfiber from external interference, but does not change the optical properties of the fiber and the response speed of the sensor, which makes the sensor more robust for real applications. Experimental results show that the sensor can achieve a sensitivity of 2.16 nm/% with a good linearity for concentration from 0% to 20%. It is theoretically proved that the sensitivity can be further improved by optimizing the diameter parameters. Such structure may be used as low loss evanescent-wave-coupled optical absorption, fluorescent and gain cells, photoacoustic cells, and etc.

关键词： LPG A robust salinity sensor based on encapsulated long-period grating in microfiber

A compact electro-absorption modulator based on graphene photonic crystal fiber

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Chinese Physics B 2020年第3期29卷 238-244页

作者： Guangwei Fu Ying wang Bilin wang Kaili Yang Xiaoyu wang Xinghu Fu wa jin Weihong Bi School of Information Science and Engineering Key Laboratory for Special Fiber and Fiber Sensor of Hebei ProvinceYanshan UniversityQinhuangdao 066004China

A compact electro-absorption modulator based on graphene photonic crystal fiber is proposed. To enhance the graphene–light interaction efficiency, the innermost six air-holes of photonic crystal fiber are replaced by two large semicircular holes, and monolayer graphene is deposited on the two large semicircular holes. By optimizing the structure parameters, a strong graphene–light interaction is obtained. Moreover, the switch on–off point of the modulator is unchangeable,which is only related to the frequency of the incident light. The influence factors of this composite structure have been analyzed. The proposed modulator is compared with other graphene-based modulators, and the results show that it is filled without dielectric spacer. There are some excellent performances, such as an extinction ratio 7 dB of y-polarization mode,3-dB modulation bandwidth of 70 GHz with small footprint of 205 μm, and a consumption of energy per bit 59 pJ/bit.

关键词： graphene electro-absorption modulator finite element method

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四元数矩阵的极分解及其GL偏序

数学进展 2005年第2期34卷 187-193页

作者：庄瓦金漳州师范学院数学系漳州福建363000

本文给出了四元数矩阵的唯一极分解定理和两个四元数矩阵可同时极分解的两种刻画;进而引进了四元数矩阵的GL偏序的概念,它是重要的Lowner偏序的一般化,并得到这个新偏序的6种刻画.

关键词：四元数矩阵的唯一极分解可同时极分解 GL偏序 LSwner偏序星序减序部分等距四元数矩阵

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光子晶体光纤熔接过程中的空气孔力学特性

中国激光 2009年第11期36卷 2966-2971页

作者：付广伟毕卫红金娃燕山大学光电子工程系河北秦皇岛066004 河北省特种光纤与光纤传感重点实验室河北秦皇岛066004

在光子晶体光纤(PCFs)的熔接过程中,熔接能量和加热时间的控制是避免空气孔塌陷的关键所在。应用经典力学理论,提出了一种光子晶体光纤熔接过程中力学特性的数学模型,对熔接过程中光子晶体光纤空气孔的畸变情况及畸变对光纤模场分布变... 详细信息

在光子晶体光纤(PCFs)的熔接过程中,熔接能量和加热时间的控制是避免空气孔塌陷的关键所在。应用经典力学理论,提出了一种光子晶体光纤熔接过程中力学特性的数学模型,对熔接过程中光子晶体光纤空气孔的畸变情况及畸变对光纤模场分布变化引起的熔接损耗进行了分析。分析结果表明,通过控制熔接能量和熔接时间可以控制光子晶体光纤空气孔的畸变情况。根据理论分析结果,进行熔接实验,分析空气孔畸变引起的损耗情况。实验结果与理论值有很好的一致性。

关键词：光纤光学光子晶体光纤空气孔畸变表面张力力学特性

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待熔光子晶体光纤中的热传导特性

中国激光 2009年第9期36卷 2372-2379页

作者：付广伟毕卫红金娃燕山大学光电子工程系河北秦皇岛066004 燕山大学河北省特种光纤与光纤传感重点实验室河北秦皇岛066004

在光子晶体光纤(PCF)的熔接过程中,由于包层空气孔结构的存在,同在熔接过程中存在着潜在的空气孔形变,使得加热过程更为复杂。对待熔的光子晶体光纤的热传导特性进行了研究,以二氧化碳激光作为熔接热源,根据传热学及能量守恒定律建立三... 详细信息

在光子晶体光纤(PCF)的熔接过程中,由于包层空气孔结构的存在,同在熔接过程中存在着潜在的空气孔形变,使得加热过程更为复杂。对待熔的光子晶体光纤的热传导特性进行了研究,以二氧化碳激光作为熔接热源,根据传热学及能量守恒定律建立三维对称的热传导模型,进而对光子晶体光纤熔接的瞬态传热过程进行仿真分析和实验研究。分析表明,该模型可以很好地确定影响光子晶体光纤熔接过程中热传导特性的各个主要因素,为最终确定最佳熔接条件建立理论基础。

关键词：光纤光学光子晶体光纤数学模型瞬态热传导最佳熔接条件

All-fiber mode converter based on superimposed long period fiber gratings

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Optoelectronics Letters 2018年第2期14卷 81-83页

作者：薛艳茹毕卫红金娃田朋飞江鹏刘强靳云 School of Information Science and Engineering Yanshan University Qinhuangdao 066004 China College of Mechanical and Electrical Engineering Hebei Normal University of Science & Technology Qinhuangdao 066004 China Key Laboratory for Special Fiber and Fiber Sensor of Heibei Province Qinhuangdao 066004 China

In this paper, a novel broadband all-fiber mode converter is proposed and experimentally demonstrated. Through writing a pair of superimposed long period fiber gratings(SLPFGs) in tow-mode fiber(TMF) with a CO_2 laser, the mode converter can realize the conversion from LP_(01) to LP_(11) owing to the phase matching condition. Numerical and experimental results show that the bandwidth of this mode converter is 3 times broader than that of a single grating converter. The converter has low loss, high coupling efficiency, small size and is easy to fabricate, so it can be widely used in mode-division multiplexing.

关键词：模式变换器纤维栅栏加长试验性小尺寸

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四元数矩阵平方保持偏序关系的刻画

黑龙江大学自然科学学报 2010年第1期27卷 25-29页

作者：庄瓦金漳州师范学院数学系漳州363000

给出了四元数矩阵平方保持右(左)星序关系、星序关系的完整刻画,并得到了在减序条件下含EP矩阵的四元数矩阵平方的Lwner偏序、减序的刻画。

关键词：四元数矩阵的平方右(左)星序星序减序 Lwner偏序