共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
5.
热极化保偏光纤构成的全光纤电光强度调制器 总被引:4,自引:4,他引:0
利用热极化熊猫保偏光纤器件和保偏光纤耦合器,构成Mach-Zehnder干涉仪结构,实验验证了一种新型的全光纤电光强度调制器.由于该光纤电光强度调制器是用全保偏光纤构成,解决了偏振衰减问题,因此获得了稳定的光强调制响应输出. 相似文献
6.
熔锥型保偏耦合器的传输特性决定了其光学原理与功能的实现。为了从理论上分析各参量对保偏耦合器传输特性的影响,基于热-结构-电磁多物理场耦合理论,建立了熔锥型熊猫光纤耦合器双锥模型,应用有限元法,分析了各参量对熊猫光纤耦合器传输特性的影响。结果表明应力区与包层折射率差影响耦合区纵向电磁场的分布,折射率差越大,纵向电磁场分布的变形也越大;HE1x1模和HEy11模的传播常量对偏振主轴角度差不敏感,偏振主轴角度差是通过耦合系数进而影响保偏光纤耦合器的消光比的;HE1x1模的传播常量对熔锥的熔锥区横截面椭圆率比较敏感,横截面椭圆率变化6.67%时Δβx11变化0.14%,计算结果表明当熔锥区横截面椭圆率为0.56时可获得较高性能的耦合器。 相似文献
7.
基于长周期光纤光栅嵌入型Sagnac环光谱的折射率测量 总被引:1,自引:0,他引:1
将长周期光纤光栅(LPG)和光纤Sagnac环相结合,实现了折射率和温度的同时测量.首先利用二氧化碳激光器在保偏光纤上制作了长周期光纤光栅(PM-LPG),然后把该PM-LPG和普通单模光纤耦合器组成Sagnac环,作为传感单元.实验选择其某一透射峰作为测试对象,其波长随温度变化,强度随折射率变化,因此可实现两个参量的... 相似文献
8.
介绍一种已研制成的低损耗、宽带、结构紧凑的保偏光纤定向耦合器(PPFDC),它可用于今后的相干纤维光学传输系统或陀螺仪上。这种耦合器由两块直径为200μm蓝宝石球透镜、一块3dB分光器和四根锥形氧化铝陶瓷套管组成,套管上的基准扁平面用于使光纤在接点保持偏振。由于直管内光纤只有很短一段经过抛光,故光纤的固有热应力变化最小。光轴和机械轴成一定角度,因而光纤端面或透镜表面不会出现串扰光。耦合器的光学方向性大于50dB,在1.3μm波长区的反射损耗大于40dB。在1.2到1.4μm内的过量损耗小于1dB。消光比大于25dB。耦合器耦合区的长度包括两块球透镜和分光器在内约1mm,光纤端面分布反馈激光二极管的谱线宽度用耦合器由延迟自零检测系统测量。采用调相耦合器的新型保偏光纤陀螺仪的实验结果表明,灵敏度和稳定度均是适用的。这些实验结果证实耦合器的上述各种特性均是正确的。 相似文献
9.
10.
11.
光纤耦合器的理论、设计及进展 总被引:1,自引:0,他引:1
系统总结了光纤耦合器的发展历程,归纳提炼出各个阶段的标志性事件;详细阐述了光纤耦合器的耦合类型、制作方法、性能参数;详细评述了光纤耦合器的理论分析方法;全面分析了X型、星型、光栅型、混合型等各种典型光纤耦合器的基本结构、工作原理及耦合特性;指出并展望了光纤耦合器的发展方向和应用前景。作者率先提出并设计了超长周期光纤光栅耦合器,实验上实现了两个超长周期光纤光栅之间的有效耦合。 相似文献
12.
13.
Ion exchange in a melt of lithium and potassium sulfates is utilized to form couplers for multimode fiber optics. The results of coupling measurements on asymetric Y-branch couplers are given. 相似文献
14.
Edward Miles 《Fiber and Integrated Optics》1991,10(4):323-350
The Small-Scale Integration (SSI) of fused couplers is proposed. The idea is to make several couplers on a single continuous piece of fiber rather than making discrete couplers and then splicing them together. Rudimentary tooling was set up to fabricate the couplers. Nine devices were successfully integrated onto a single fiber. In addition, a theory of fused tapers was developed. The fabrication parameters are analytically related to fiber geometry, which in turn, is related to the optical performance of the device. 相似文献
15.
Star couplers and bidirectional couplers for use in fiber optic networks have been constructed using binary phase transmission gratings. The principles of operation and the performance of these devices are discussed. Experimental results are shown which agree with the theoretical predictions to an accuracy of 0.5 dB. 相似文献
16.
提出双环掺铒光纤激光器耦合反馈控制混沌的物理模型,利用定向耦合器将系统的输出变量反馈到系统中,通过间接控制损耗系数,并选取适当的反馈系数,实现对系统混沌的控制。分析了反馈系数对激光器由混沌态进入周期态和稳定态的动力学行为的影响。数值模拟表明:改变系统损耗系数,双环掺铒光纤激光器可由周期态进入混沌态;加入耦合反馈,适当调制反馈系数,可以将双环光纤激光器混沌控制到周期态和稳定态上;提高系统反馈系数,系统进入稳定态的时间变短。选取不同的系统初值,激光器总能得到两种不同的奇怪吸引子,可见双环掺铒光纤激光器具有双稳态特征。 相似文献
17.
《Fiber and Integrated Optics》2007,26(4):187-200
An experimental study of the WDM response of fused fiber couplers and an M-Z interferometer is presented. The WDM practical implementation limits of single fused fiber couplers, along with fiber tapering measurements, were obtained. Mach-Zehnder interferometric devices based on fused fiber couplers were included in this work in order to surpass the single coupler's WDM limitations and widen the operation range of the analyzed fused fiber devices. 相似文献
18.
Abstract Star couplers and bidirectional couplers for use in fiber optic networks have been constructed using binary phase transmission gratings. The principles of operation and the performance of these devices are discussed. Experimental results are shown which agree with the theoretical predictions to an accuracy of 0.5 dB. 相似文献
19.
Photonic crystal fiber coupler 总被引:3,自引:0,他引:3
Fiber couplers made with photonic crystal fibers (PCF) are reported. Two types of PCF were fabricated by means of stacking a group of silica tubes around a silica rod and drawing them. The fiber couplers were made by use of the fused biconical tapered method. With a fiber that had five hexagonally stacked layers of air holes, a 33/67 coupling ratio was obtained, and with a one-layer four-hole fiber, a 48/52 coupling ratio was obtained. The fabrication processes and the characteristics of the PCFs and the PCF couplers are presented. 相似文献
20.
Arun K. Agarwal 《Fiber and Integrated Optics》2013,32(1):27-53
The present trends are toward implementation of fiber optics in data-distribution networks such as data buses, community antenna television, and local area networks. The thrust is, therefore, on high-volume and economical production of good quality optical fiber couplers. This paper reviews the various techniques for making fiber couplers. Important characteristics of various constructions and configurations together with their merits and demerits are discussed. 相似文献