共查询到19条相似文献,搜索用时 73 毫秒
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利用光束传播法模拟了光波在不同结构的双芯光子晶体光纤内的传输状况,并计算了其耦合长度。分析了耦合长度随光波长、孔半径变化的一般规律;当双芯光子晶体光纤的结构一定时,耦合长度随波长增大而减小;孔间距和波长不变时,耦合长度随空气孔半径增大而增大。 相似文献
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为了优化双芯光子晶体光纤耦合器的耦合性能,采用改变两纤芯间空气孔的结构和孔内折射率的方法,得到了双芯光子晶体光纤耦合器的优化模型。基于光束传播法数值分析出两纤芯间空气孔尺寸以及孔内注入材料折射率的变化对双芯光子晶体光纤耦合器的耦合性能的影响。结果表明,由于光纤的整体结构不变,使得光纤损耗系数保持不变;减小双芯间的空气孔孔径或增大孔内折射率都会使耦合器的耦合长度减小,两不同偏振方向的耦合长度差异减小,损耗减小;双芯间空气孔内折射率可调性强,使得光纤耦合器的耦合性能有易调节的优点,为设计双芯光子晶体光纤耦合器的优化模型提供了理论支持。 相似文献
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为了解决光纤通信系统中的色散补偿问题,提出一种新型的用于色散补偿的双芯光子晶体光纤,其构成材料是纯石英和空气,即在常规光子晶体光纤基础上变化包层第1圈和第3圈空气孔、增大了结构参量变化的自由度。采用平面波展开法对其色散补偿特性进行了数值研究,并模拟了包层结构参量与色散之间的关系,计算得出这种光纤的色散可以达到-1956.327ps·nm-1·km-1,能够补偿超过自身长度100倍的普通单模光纤。结果表明,双芯光子晶体光纤在色散补偿方面具有很大潜力,在未来光通信系统中将发挥重要作用。 相似文献
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利用自制的双芯光子晶体光纤(D-PCF)与单模光纤(SMF)熔接,并在熔接点塌陷空气孔,提出了一种新型的D-PCF马赫-曾德干涉仪(MZI).利用图像提取法和有限元方法,分析并计算了实际拉制出的D-PCF支持的光纤模式.经过分析发现,这种新型光纤干涉仪的主要干涉模式是环芯模式,不同于传统光纤干涉仪的干涉模式.实验观测了... 相似文献
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文中利用FDTD方法模拟了光波在双芯光子晶体光纤中的色散特性。给出了FDTD方法的理论基础和仿真结果,同时分析了色散特性与占空比的关系,在相同的空气孔间距条件下,占空比越大,反常色散峰值越大,峰值色散点往短波区域移动。 相似文献
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文章设计了一种双芯光子晶体光纤温度传感器,利用纤芯间高折射率柱的谐振效应实现对温度的精确传感.在纤芯间空气孔中注入液晶材料,利用液晶材料折射率的温度变化特性,使温度变化对双芯间的耦合特性产生影响,从而实现对温度的精确传感.仿真结果表明,通过测量双芯透射光功率就可以实现对温度的测量,其灵敏度可以达到2.5 mw/K. 相似文献
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光子晶体光纤压力传感器可广泛用于各种压力环境监测中.文章分析了光子晶体光纤中光脉冲的传输特性,提出了相位调制型光子晶体光纤压力传感器的基本模型,对光子晶体光纤传感器基于光脉冲相位和光强的信号检测方案进行了讨论.光子晶体光纤传感器的压力敏感性高,而温度敏感远远低于传统的光纤传感器.光子晶体光纤传感器系统简洁、适用. 相似文献
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Integral imaging is a three dimensional(3D)display technology without any additional equipment.A new system is proposed in this paper which consists of the elemental images of real images in real mode(RIRM)and the ones of virtual images in real mode(VIRM).The real images in real mode are the same as the conventional integral images.The virtual images in real mode are obtained by changing the coordinates of the corresponding points in elemental images which can be reconstructed by the lens array in virtual space.In order to reduce the spot size of the reconstructed images,the diffuser in conventional integral imaging is given up in the proposed method.Then the spot size is nearly1/20 of that in the conventional system.And an optical integral imaging system is constructed to confirm that our proposed method opens a new way for the application of the passive 3D display technology. 相似文献
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In this paper, we propose a photonic crystal fiber (PCF) sensor based on the surface plasmonic resonance (SPR) effect for simultaneous temperature and refractive index (RI) measurement. The coupling characteristics and sensing performance of the sensor are analyzed using the full vector finite element method (FEM). The sensor provides two channels for independent measurement of RI and temperature. When operating independently, channel I supports y-polarized light with a sensitivity of up to 7 000 nm/RIU for detecting RI, while channel II supports x-polarized light with a sensitivity of up to 16 nm/°C for detecting temperature. Additionally, we investigate the influence of gold layer thickness on the sensing performance to optimize the sensor. 相似文献
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提出一种镀有铜(Cu)膜的锥形光子晶体光纤(TPCF) 倏逝波耦合温度传感器。其结构是在两段单模光纤 (SMF)之间熔接上一段长为20mm的PCF,并在熔融拉锥后的TPCF表面 上蒸镀一 层Cu膜制成的。熔接机放电电流设置为10mA,拉锥机拉锥速度为0.08mm/s,H2流量为160mL/min。拉 锥完成后的TPCF锥腰最细处为68.47μm,传感器干涉条纹对比度为 8dB。将传感器放入温控箱中, 传感器两端分别连接至宽带光源(ASE)和光谱仪(OSA)上进行温度传感实验。实验结果表明, 当锥区长为10mm,镀 Cu膜厚为110nm时,在30~80℃温度变化范 围内,传感器的温度灵敏度最高可达0.075dB/℃。本文制作的传感 器 具有结构紧凑、制备简单和灵敏度高等特点,可用于工业生产、生物医学和电力电子等领域 的温度检测。 相似文献
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GUO Xuan LIU Feng BI Wei-hong 《光电子快报》2007,3(3):199-202
The special character of a PCF which is used as a gas or liquid sensor is discussed. The field distribution is analyzed when the solid core PCF is injected with different medium that has different relative dielectric constant(or refractive index) . And the experiential formulas of the relation between refractive index of some kinds of liquid and their concentration are given,in order to measure the concentration of the relative liquid. At the same time,the effect of propagation constant on PCF sensor character is also discussed. Furthermore,the photonic band-gap(PBG) of PCF(PBG-PCF) is calculated at different medium relative dielectric constant,when it is injected with different medium. That is the principle basis for this kind of PCF sensors. 相似文献
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A surface plasmon resonance(SPR) sensor based on a multi-core photonic crystal fiber(PCF) is presented in this paper.There is only one analyte channel positioned in the center of the PCF cross section,rather than several closely arranged analyte channels around the central core.So the design of this sensor not only reduces the consumption of gold and samples,but also effectively avoids the interference between neighboring analyte channels.Optical field distributions of this fiber at different wavelengths and the sensing properties of this sensor are theoretically analyzed and discussed using finite element method(FEM).Simulation results confirm that both the thickness of metallic layer and the fiber structural parameters have significant effect on sensing performance.The amplitude sensitivity of the sensor is found to be 1.74×10-5RIU,and the spectral sensitivity is 3300 nm/RIU,corresponding to a resolution of 3.03×10-5 RIU.Finally,in order to achieve PCF-SPR sensing characteristics,an experiment design scheme based on spectroscopic detection method is proposed. 相似文献
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A novel miniature Fabry-Perot interferometric (FPI) temperature sensor is proposed and demonstrated experimentally. The modal interferometer is fabricated by just splicing a section of photonic crystal fiber (PCF) with a single-mode fiber (SMF). The air holes of the PCF are fully collapsed by the discharge arc during the splicing procedure to enhance the reflection coefficient of the splicing point. The transmission spectra with different temperatures are measured, and the experimental results show that the linear response of 11.12 pm/°C in the range of 30–80 °C is obtained. This sensor has potential applications in temperature measurement field. 相似文献
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WANG Jing WANG Zhen-li SHI Yan-mei 《光电子快报》2006,2(3):206-208
Since the first PCF was fabricated in 1996 ,PCF hasattractedthe significant attention due toits unique char-acteristics . One of the highlights is that ,according tothe flexibility of conveniently changing the core area ofPCF,a smaller mode-field area can… 相似文献