Novel Tunable PMD Compensation Technology Using Linear Chirped Fiber Bragg Grating

Based on uniform fiber Bragg grating bonded with a magnetostrietive rod in the non-uniform magnetic field, a novel PMD compensation technique is proposed. This all-fiber PMD compensation technology is cost-effective and flexible in designing the differential group delay profile.     

线性啁啾光纤光栅变迹函数的研究

文中利用传输矩阵法对我们构造的四种变迹函数所描述的线性啁啾光纤光栅的光学特性进行了数值计算,并与常用的高斯型变迹线性啁啾光纤光栅的最佳光学特性进行了比较和分析,得出了一些有意义的结论,为设计和制作合适的线性啁啾光纤光栅用作色散补偿器提供了一定的理论依据。     

一种新颖的宽带可调光纤光栅滤波器

分析了光纤光栅（FBG）调谐的基本原理,进而采用新颖的调谐结构,设计并实现了一种宽带可调谐的FBG滤波器。该滤波器仅用1支FBG制做而成,其波长调谐范围最高可达40nm。实验结果表明,该FBG滤波器的调谐波长与调谐步进位移量之间具有良好的二次曲线关系。     

光纤光栅传感器的应用概况

就国外光纤光栅传感器在民用工程结构、航空航天业、船舶航运业、石油化工业、电力工业、核工业、医学等方面的应用作了简单的综述。     

一种基于啁啾光纤光栅温度不敏感的应力传感器

提出了一种基于啁啾光纤光栅温度不敏感的应力传感器.这种传感器是以腐蚀后啁啾的Bragg光纤光栅为敏感元件,利用光栅反射功率的变化测量应力的变化,反射功率对温度是不敏感的.利用光功率计检测光栅反射功率的变化.     

Chirp光纤光栅色散补偿理论及实验

分析了 Ｃｈｉｒｐ光纤Ｂｒａｇｇ光栅进行色散补偿的基本原理,２０ Ｇｂ／ｓ、１００ ｋｍ色散补偿的实验表明,利用Ｃｈｉｒｐ光纤Ｂｒａｇｇ光栅是一种优选的色散补偿方案。     

Temperature Compensation for Double Fiber Bragg Grating Sensors

A novel double fiber Bragg grating(FBG) strain sensor configuration is presented. Temperature compensation method is based on double FBG moored on a rhombus frame. Through the theoretical analysis,the relation between relative shift of Bragg wavelength and the strain applied on the sensor is obtained,and the analytical expression of strain sensitivity coefficient is also given. The experiment results show that:in the strain range of 0～0.8 mm,the relation between the relative shift of Bragg wavelength and applied strain is linear,and the dispersion of double FBG wavelength at the range of -25 ℃～60 ℃ is 0～0.002 nm. The strain sensitivity of the displacement sensor configuration is 0.171 nm/με,and is nearly twice than that of single FC sensor.     

Transmission Characteristics of Sagnac Loop with Fiber Bragg Grating

A transmission filter composed of a Sagnac loop and a fiber Bragg grating is studied in detail.It is found that the transmission spectrum of this filter is the splitting of the reflection spectrum of the fiber Bragg gratings.The filter can behave as a multiple-passband filter when the fiber Bragg grating is strong and as a single-band filter when the fiber Bragg grating is weak.Very narrow transmission filters can be obtained in this way.     

取样啁啾光纤光栅传输特性的研究

运用传输矩阵理论，对一种新型色散补偿光纤光栅——取样啁啾光纤光栅的传输特性进行了模拟研究。研究了光栅反射谱特性随光栅参数的变化规律。作为应用实例，本文给出了适合于对10Gb／s WDM系统进行色散补偿的8通道取样啁啾光栅的相关参数。     

光纤布喇格光栅的多层膜分析方法

提出并利用多层膜分析方法对光纤布喇格光栅进行了分析。数值模拟结果表明,该方法能较好地说明光栅的特性,与实验结果也能较好地吻合。该方法丰富了光纤光栅的理论。     

Novel Distributed Fiber Bragg Grating Sensing System Based on M-Z Interferometer

One of the problems in using grating sensors is how to measure a small Bragg wavelength shift accurately. Nowadays demodulation techniques are mainly based on the edge filter, tunable filter, or interferometric scanning methods. Interferometric demodulation is widely accepted as the technology which can provide the high sensitivity. An interrogation system using the interferometric scanning method is presented, in which an unbalanced fiber M-Z interferometer is used as the wavelength scanner for temperature measurement. A novel fiber Bragg grating sensor system based on M-Z interferometric demodulation technique is presented in this paper. The temperature sensitivity measured in the experiment is almost consistent with that obtained from the theoretic calculation.     

光纤布拉格光栅传感器的温度补偿研究

应力和温度变化引起光纤布拉格光栅(FBG)传感器中心波长漂移的交叉敏感效应制约了光纤布拉格光栅传感器的实用化。在简介光纤布拉格光栅传感器工作原理的基础上,综述了近年来国内外在该领域实现温度补偿的相关技术和消除或减弱传感器温度敏感的方法,阐述了光纤布拉格光栅传感器温度补偿的原理,并分析了每种方法的特点,探讨了光纤布拉格光栅传感器应用中存在的问题。     

Special Apodized Fiber Bragg Grating for Flat—top Band—pass Reflectivity Filter

The characteristics of special apodized fiber Bragg grating (FBG) in flat--top pass--band as reflectivity filter are presented. This special apodized FBG was designed by the particle swarm optimization algorithm. Compared with conventional apodized FBG, the special apodized FBG presented was more robust in the flat—top pass——band characteristic even if the strength of grating is very week. This technology is very interesting in designing the filter for wavelength division multiplexing system.     

基于叠印啁啾光纤布拉格光栅的宽谱微波光子信道化接收方法

提出了利用叠印啁啾光纤布拉格光栅(S-CFBG)实现宽谱微波信号光子信道化接收的方法。利用一个S-CFBG产生光频梳(OFC),接收的微波信号被强度调制器调制到OFC的各个载波上。第二个S-CFBG对不同的边带进行滤波,利用波分复用(WDM)解复用器进行信道分离,实现对宽谱微波信号频率的实时测量。该方法还可以同时检测不同射频(RF)载波上所携带的数据信息,无需传统的电本振源阵列,简化了系统结构。建立了测量范围为0～20GHz,测量精度为0.5GHz的宽谱微波信号信道化接收仿真系统。实现了不同RF频率上携带信息的实时同步检测,并对接收误码性能进行了分析。     

Simultaneous Strain and Temperature Measurement Using Single High—duty—cycle Sampled Fiber Bragg Grating

A novel and simple fiber grating sensor based on high-duty-cycle sample fiber Bragg grating is proposed and demonstrated experimentally,This type of sensor can measure strain and temperature simultaneously with merits of low cost,high sensitivity and immunity to electro-magneic interference.The sensor has an accuracy of 20μεand 0.8 ℃ over a strain range of 500-1500 με and a temperature range of 5-36℃ under experimental conditions.     

一种高灵敏度光纤Bragg光栅温度传感器

设计了一种基于光纤Bragg光栅(FBG)的高灵敏度温度传感器,分析了它的温度传感特性。该温度传感器的灵敏度为0．474nm／℃,是裸光栅的45．9倍;线性度为0．9988;通过调节有关参数可进一步提高或选择合适的灵敏度;通过改变参数可以调节该传感的传感区段,可用于常温下的温度测量。     

基于啁啾相移光纤光栅的多波长滤波器的研究

使用Ⅴ-Ⅰ传输矩阵法分析了相移量、相移点位置以及啁啾系数对啁啾相移光纤光栅透射谱特性的影响,并分析了在啁啾光纤光栅中同时引入多相移时生成的多陷波滤波器的波长间隔,发现其与以同样的位置引入单相移时陷波滤波器的波长偏离间隔基本一致。依据仿真分析结果,可以优化啁啾相移光栅相移数量、位置间隔、啁啾系数和相移量的参数选择,设计出实际需要的多波长滤波器。     

Fabrication of High Quality Broadband Type IIA Chirped Fiber Bragg Gratings

Chirped fiber Bragg gratings have found many applications in optical communication and sensing systems. High quality filters based on chirped fiber Bragg gratings with reflection bandwidth of 2.6 and 32nm and high reflectivity are demonstrated experimentally with 2 and 4cm long phase masks, respectively. These filters with flat reflection band and high reflectivity are achieved by writing type IIA chirped Bragg gratings.     

基于可调F-P滤波器的光纤光栅传感器阵列查询技术

利用可调 F- P滤波器对四个光纤光栅组成的传感器阵列进行波长扫描 ,借助示波器和探测器对滤波光束的时序分布进行观察 ,实现地址查询。比较波长漂移前后传感阵列的反射谱 ,可用于解调 ,实验结果与预期值基本一致。选用反射率相差悬殊的光栅作传感元 ,有利于增加测量范围     

Interrogating a Fiber Bragg Grating Vibration Sensor by Narrow Line Width Light

A method to interrogate fiber Bragg grating vibration sensor by narrow line width light is demonstrated. The interrogation scheme takes advantage of the intensity modulation of narrow spectral bandwidth light, such as distributed feedback laser, when a reflection or transmission spectrum curve of an fiber Bragg grating （FBG） moves due to the strain which is applied on the sensor. The sensor＇s response to accelerating frequency and amplitude is measured by experiment. The factors which have impacts on the sensitivity of the interrogation system are also discussed.