包层为单轴晶体材料的光纤非线性及应用
发布时间：2019-04-27 09:50
【摘要】：在超高速超大容量光纤通信系统中,随着对色散和衰减的逐步解决,光纤的非线性成为影响信号传输质量的重要因素。光纤的非线性由光纤的光学参数和几何参数共同决定,因此可通过优化设计光纤以调整其非线性,使其更高效地服务于新一代光纤通信系统或光器件设计。本文利用光波导理论,运用全矢量法模拟分析了单轴晶体包层光纤基模的有效模场面积和非线性系数,并进行数值求解,获得了如下结论:1.单轴晶体包层主折射率比kcl对光纤的模场分布有影响,光纤的有效模场面积随着kcl的减小而增大,在λ1.3μm时,负单轴晶体(kcl1)包层光纤具有比传统光纤更大的模场面积和更低的光功率密度。2.在波长λ1.3μm的范围,单轴晶体包层光纤的主折射率比越小,其非线性系数就越小,表明采用负单轴晶体材料作为包层将能更充分地抑制该种光纤在通信过程中产生的非线性效应;而采用正单轴晶体材料作为包层将使得该种光纤表现出更强烈的非线性效应,该结论为非线性光纤通信器件和非线性光纤传感器的设计提供理论基础。3.一定入射波长下,如λ=1.55μm,在改变主折射率比的同时分别改变光纤半径、纤芯折射率、包层-纤芯折射率差,发现该种光纤的非线性系数有着不同的变化特性,表明同时改变光纤参数以及主折射率比可优化设计该种光纤的非线性系数。4.分别采用负单轴电光晶体铌酸锂(LiNbO3)和弹光晶体磷酸二氢钾(KDP)作为光纤的包层时,利用LiNbO3晶体的电光效应或KDP晶体的弹光效应,通过施加外电场或应变场可实现非线性系数的连续可调。
[Abstract]:In ultra-high speed and super-large capacity optical fiber communication system, with the gradual solution of dispersion and attenuation, the nonlinearity of optical fiber becomes an important factor affecting the quality of signal transmission. The nonlinearity of the fiber is determined by the optical parameters and geometric parameters of the fiber, so the nonlinear of the fiber can be adjusted by optimizing the design of the fiber, so that it can serve the design of the next generation optical fiber communication system or optical device more efficiently. In this paper, the effective mode area and the nonlinear coefficient of the fundamental mode of uniaxial crystal clad fiber are simulated and analyzed by using the optical waveguide theory and the full vector method. The numerical results are obtained as follows: 1. The main refractive index ratio of uniaxial crystal cladding has an effect on the mode field distribution of the fiber. The effective mode field area of the fiber increases with the decrease of kcl. At 位 1.3 渭 m, the effective mode field area of the fiber increases with the decrease of kcl. Negative uniaxial crystal (kcl1) clad fiber has larger mode field area and lower optical power density than traditional fiber. 2. In the wavelength range of 位 1.3 渭 m, the smaller the principal refractive index ratio of uniaxial crystal clad fiber is, the smaller the nonlinear coefficient is. It is shown that using negative uniaxial crystal material as cladding can restrain the nonlinear effect of this kind of fiber in the communication process more fully. The positive uniaxial crystal material as cladding will make the fiber show stronger nonlinear effect. The conclusion provides a theoretical basis for the design of nonlinear optical fiber communication devices and nonlinear optical fiber sensors. 3. At a certain incident wavelength, such as 位 = 1.55 渭 m, the fiber radius, core refractive index and cladding-core refractive index difference are changed at the same time of changing the principal refractive index ratio. It is found that the nonlinear coefficient of this kind of fiber has different variation characteristics. It is shown that the nonlinear coefficient of the fiber can be optimized by changing the parameters of the fiber and the principal refractive index ratio at the same time. 4. When negative uniaxial electro-optic crystal lithium niobate (LiNbO3) and elasto-optical crystal potassium dihydrogen phosphate (KDP) are used as cladding layer of optical fiber, the electro-optic effect of LiNbO3 crystal or elasto-optical effect of KDP crystal are used. The continuous adjustment of nonlinear coefficient can be achieved by applying external electric field or strain field.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253
本文编号：2466878
[Abstract]:In ultra-high speed and super-large capacity optical fiber communication system, with the gradual solution of dispersion and attenuation, the nonlinearity of optical fiber becomes an important factor affecting the quality of signal transmission. The nonlinearity of the fiber is determined by the optical parameters and geometric parameters of the fiber, so the nonlinear of the fiber can be adjusted by optimizing the design of the fiber, so that it can serve the design of the next generation optical fiber communication system or optical device more efficiently. In this paper, the effective mode area and the nonlinear coefficient of the fundamental mode of uniaxial crystal clad fiber are simulated and analyzed by using the optical waveguide theory and the full vector method. The numerical results are obtained as follows: 1. The main refractive index ratio of uniaxial crystal cladding has an effect on the mode field distribution of the fiber. The effective mode field area of the fiber increases with the decrease of kcl. At 位 1.3 渭 m, the effective mode field area of the fiber increases with the decrease of kcl. Negative uniaxial crystal (kcl1) clad fiber has larger mode field area and lower optical power density than traditional fiber. 2. In the wavelength range of 位 1.3 渭 m, the smaller the principal refractive index ratio of uniaxial crystal clad fiber is, the smaller the nonlinear coefficient is. It is shown that using negative uniaxial crystal material as cladding can restrain the nonlinear effect of this kind of fiber in the communication process more fully. The positive uniaxial crystal material as cladding will make the fiber show stronger nonlinear effect. The conclusion provides a theoretical basis for the design of nonlinear optical fiber communication devices and nonlinear optical fiber sensors. 3. At a certain incident wavelength, such as 位 = 1.55 渭 m, the fiber radius, core refractive index and cladding-core refractive index difference are changed at the same time of changing the principal refractive index ratio. It is found that the nonlinear coefficient of this kind of fiber has different variation characteristics. It is shown that the nonlinear coefficient of the fiber can be optimized by changing the parameters of the fiber and the principal refractive index ratio at the same time. 4. When negative uniaxial electro-optic crystal lithium niobate (LiNbO3) and elasto-optical crystal potassium dihydrogen phosphate (KDP) are used as cladding layer of optical fiber, the electro-optic effect of LiNbO3 crystal or elasto-optical effect of KDP crystal are used. The continuous adjustment of nonlinear coefficient can be achieved by applying external electric field or strain field.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253
【参考文献】
相关期刊论文 前3条
1 张岩宇;励强华;;单轴各向异性晶体纤芯偏振光传播特性分析[J];光学学报;2014年02期
2 李丽君;马辉;张艳亮;隋涛;来永政;李晶;曹茂永;;单轴晶体包层光纤Bragg光栅反射谱特性模拟研究[J];物理学报;2012年13期
3 张晓萍,谭志红;以单轴晶体为内包层的双包层光纤偏振特性研究[J];量子电子学报;2002年03期
相关博士学位论文 前1条
1 钱艳楠;不同价态抗光损伤离子对Er:LiNbO_3晶体缺陷和光学性能的影响[D];哈尔滨工业大学;2012年
，本文编号：2466878
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2466878.html
