基于锥形光纤滤波器的C波段宽带可调谐掺铒光纤激光器

利用熔融拉锥技术制作了光纤M-Z干涉滤波器.将该滤波器放入Sagnac滤波器,构建了新型的可调谐滤波器.最后利用该Sagnac滤波器,制作了C波段宽带可调谐掺铒光纤激光器.实验结果表明：激光器的调谐范围超过40 nm,各激光光谱的平坦度低于2 dB,激光的旁模抑制比超过50 dB,而激光的3dB线宽小于0.1 nm.     

All-Fiber Optic Temperature Sensor

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荧光光纤温度传感器

介绍了荧光光纤温度传感的测量原理，对激励光源的选择、光信号与光纤的耦合、信号处理系统进行了分析，最后说明了该传感器的特点及发展前景．     

基于光时域反射仪的光纤损耗测试实验

光时域反射仪(optical time domain reflect meter,OTDR)作为测试光纤的光电一体化仪表,可进行光纤长度、光纤的传输衰减、接头衰减和故障定位等的测量。设计了一个基于工程实际中的常用器材,针对不同工程状况,通过OTDR进行测量,总结了不同工况下的测试曲线特性。通过实验,使学生了解OTDR的工作原理及传感光纤在实际工程中的应用,将理论与实践相结合,激发学生们对光纤传感的兴趣和积极性。     

基于拉锥多模光纤的高灵敏度光纤折射率传感器

使用氢氧焰对62.5/125μm芯径的多模光纤进行熔融拉锥,得到拉锥长度30mm,光纤直径3.553 2μm的拉锥多模光纤,以此制作单模-拉锥多模-单模(STMS)光纤结构的折射率(RI)传感器,此结构具有较强倏逝场,对外界折射率反应灵敏。在室温25℃条件下,将此结构中的拉锥多模光纤伸直并置于腾空状态,用液滴包裹拉锥区域,实验表明,此结构折射率传感器在折射率范围1.341 4~1.358 6内具有1 009.9nm/RIU的灵敏度,可精密监测液体折射率变化。     

球形光纤探头耦合特性的研究

介绍了针对不同球形光纤传感探头进行的数值研究，计算了光纤参数对球形探头光强耦合效率的影响，得出了当探头结构为半圆形时耦合效果最优和小数值孔径光纤探头制作精度要求较低的结论。     

温度传感器

按工作原理及物理效应把温度传感器分成五类，介绍各类温度传感器工作原理及特点，分析具有代表性AD950、LM35系列的集成温度传感器的特性以及应用实例。     

光纤气体检测技术的探讨

基于气体在其特征吸收波长下对光的吸收随浓度变化的机理,研制一种光纤式气体监测仪.根据被测气体的特征吸收对应的波长选择发光二极管作为光源.为保证测量精度,采取测量信号与参考信号相比的技术.只要对仪器的某些参数稍加改变,可测量多种气体的浓度.     

Surface-enhanced Raman scattering sensor based on fused biconical taper zone of optical fiber

In this paper, a novel surface-enhanced Raman scattering (SERS) sensor combined with fused biconical taper fiber (FBTF) and film coated with silver sols is proposed. This structure is designed to significantly increase the SERS active surface when the length of the taper is increased and the radius is reduced, since the penetration depth is inversely proportional to the taper radius and proportional to the taper length according to the fiber-optic evanescent-wave theory. Based on the SERS sensing principle, the feasibility of FBTF sensor is analyzed in this paper. As a result, the Raman spectrum of R6G is obtained from the fused biconical taper zone surface coating with the silver sols in our experiments. The detected concentration is up to 10⁻⁷mol/L.     

High sensitive fiber strain sensor using suspended-core fibers

A novel fiber strain sensor is proposed, based on the two-mode interference of a suspended-core fiber. A fullvectorial finite difference mode solver is employed as the numerical tool for characterizing the proposed strain sensor. The numerical results show that the proposed strain sensor has an estimated sensitivity of 0.05 rad/(m·με), higher than that of the strain sensors using conventional multimode fibers, while the temperature sensitivity of the proposed sensor is relatively low.     

试论光纤通信技术的应用与发展趋势

现今,光纤通信技术已经成为了一次世界性的改革,它把人类带上了一个信息的高速公路,由此可见光纤通信在信息的传递上面起着至关重要的作用,本文就光纤通信技术的应用与发展趋势进行了相应的探讨。     

Stress and modal birefringence of single-mode specialty optical fibers with three-stress regions

Stress-induced birefringence and modal birefringence of single-mode specialty optical fibers with three stress regions are numerically analyzed by the vector finite element method. Stress distribution and stress-induced birefringence distribution of three kinds of optical fibers with different cross structures are presented and compared, and the influence on the stress-induced birefringence by temperature change are analyzed as well. The results show that the fibers with three-stress regions have a lower linear birefringence, which is very important for the fabrication of the circular polarization-maintaining fiber with high performance drawn from the same fiber preform by using the spinning method.     

High-finesse displacement sensor and a theoretical accelerometer model based on a fiber Fabry-Perot interferometer

A displacement sensor based on the fiber Fabry-Perot （F-P） cavity was proposed in this paper. Theoretical and experimental analyses were presented. Displacement resolution was demonstrated by spectrum-domain experiments to obtain the dynamic range of the F-P sensor, and a piezoelectric crystal unit （PZT） was used as the driver. The output signal was modulated by a piezoelectric ceramic ring and demodulated by a phase-locked oscillator. The experimental results show that the displacement resolution of the F-P sensor is less than 5 nm and the dynamic range is more than 100 μm. As acceleration is the second-order differential of displacement, an accelerometer model was proposed using the finite element method （FEM） nd ANSYS software.     

浅议光纤通信课程教学改革与实践

近年来光通信技术发展迅速,我国对光通信专业人才的需求越来越高,如何培养满足社会需要的高素质专业人才就显得尤为重要。本文将从教学内容、实验室开放和考核方式三个方面探讨光纤通信课程的教学改革,以期获得更好的教学效果,进而实现培养高素质光通信人才的最终目标。     

熔融拉锥型全光纤耦合器性能分析

针对市场上最急需的,生产中最常用的熔融拉锥型全光纤耦合器,介绍了它的工作原理、制作方法以及参数测量等内容,从实验上测量了所生产光纤耦合器的插入损耗、工作波长、方向性以及工作温度等,通过实验测试表明我们所生产的光耦合器器从各项指标上都达到了实用要求。     

Simulation of distributed optical fiber disturbance detection system based on Sagnac/Mach-Zehnder interferometer and cross-correlation location

A distributed optical fiber disturbance detection system consisted of a Sagnac interferometer and a Mach-Zehnder interferometer is demonstrated. Two interferometers outputs are connected to an electric band-pass filter via a detector respectively. The central frequencies of the two filters are selected adaptively according to the disturbance frequency. The disturbance frequency is obtained by either frequency spectrum of the two interferometers outputs. An alarm is given out only when the Sagnac interferometer output is changed. A disturbance position is determined by calculating a time difference with a cross-correlation method between the filter output connected to the Sagnac interferometer and derivative of the filter output connected to the Mach-Zehnder interferometer. The frequency spectrum, derivative and cross-correlation are obtained by a signal processing system. Theory analysis and simulation results are presented. They show that the system structure and location method are effective, accurate, and immune to environmental variations.     

变温条件下光纤拉曼光谱测试及其意义

对某种光纤在温度范围从-70℃到70℃进行了变温拉曼光谱测试。实验结果表明，光纤的拉曼光谱非常稳定，几乎不随温度变化，说明该光纤化学结构在实验温度范围内能够保持稳定，暗示了光纤质量在实验温度范围内是可以保证的。因此，实验证明拉曼光谱可以作为检测光纤质量的一种有效手段。     

2.5Gbit/s 0.35μm CMOS光纤通信用收发全集成电路

采用0.35μm CMOS工艺设计2.5 Gbit/s速率光纤通信用收发全集成电路.发射部分包括复接和激光驱动电路, 完成4路622 Mbit/s随机信号输入、1路2.5 Gbit/s驱动信号输出的功能; 接收部分完成1路2.5 Gbit/s微弱随机信号输入、 4路622 Mbit/s分接输出功能.主要电路包括前置放大、限幅放大、时钟恢复、数据判决和1: 4分接. 测试结果显示, 2.5 Gbit/s光纤通信用发射芯片逻辑功能正确, 激光驱动器输出数据眼图10%～90%上升、下降沿时间分别为211.1 ps和200 ps; 2.5 Gbit/s光纤通信用接收芯片接收灵敏度优于20 mV, 恢复出的数据和时钟分别经过1: 4数据分接和1: 4时钟分频后, 相位抖动的均方根值分别为15.6 ps和1.9 ps. 两芯片均适用于2.5 Gbit/s速率光纤通信系统.     

基于光纤光栅传感的智能内窥镜形状感知系统

Thisdissertationaimsatprovidingsteadysensingfor theshapedetectionofcolonoscopes.Theresearch especiallydealswiththekeytechniquesoffiberbragg grating(FBG)largecurvaturesensorandsensornet,integratesthetechniquesofmechatronicsandcomput ergraphics,anddevelopsrealtimeFBGshapesensing systemandincrementalshapesensingsystemfor colonoscopies.Aftertheanalysisofstate of the artforthedevelop mentoftheendoscopeandthedifficultiesofcolonos copy,theactualitiesofbothendoscopicshapesensing systemsandofFBGstru…     

高压系统内置光纤温度在线监测装置的研究

研究了基于内置光纤进行高电压系统温度在线监测,阐述了该研究的结构、原理及系统的软硬件设计方案,并对装置的精度进行测试.测试结果表明,该方案能很好地解决高电压系统温度在线监测存在的问题.