侧边抛磨光纤波导传输特性的计算分析
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摘要
在各种光器件中,以侧边抛磨光纤为基底的全光纤器件正越来越多的受到人们的关注。无论是在实验室研究领域,还是在商用通信领域,都已经制成许多种光纤通信或光纤传感的全光纤器件。全光纤器件体积小、集成度高,易于与光纤系统熔接。
     在做侧边抛磨光纤器件时,因为没有理论计算的支持,需要通过做大量的实验工作,在对比和改进中才能得到性能较好的器件。而仿真分析可以方便更改各项参数,通过模拟计算得到有参考性的结果,为实验工作提供帮助。
     本文在建立侧边抛磨光纤的D型光纤边界条件的基础上,新提出了有过渡区的侧边抛磨光纤波导模型。优化了无过渡区侧边抛磨光纤仿真分析的部分结果,并建立了新的带过渡区的侧边抛磨光纤模型,使光学模型与实际抛磨形状更加接近。针对无过渡区和有过渡区侧边抛磨光纤波导模型,用三维有限差分光束传输法(3D Finite-difierent beampropaRation method)计算了光功率传输特性与光纤侧边抛磨长度、光纤侧边抛磨后剩余包层的厚度、波长以及聚合物尺寸等参数之间的关系,并对计算结果做出分析。本文的工作为实验研制侧边抛磨光纤及相关器件提供了理论参考。
     本文还进行了与侧边抛磨光纤耦合的微环形谐振腔的初步分析。介绍了环形谐振腔和侧边抛磨光纤的耦合理论,探索性地进行了微环形谐振腔的仿真模型设计,并给出了采用时域有限差分方法(FDTD)模拟的侧边抛磨光纤与环腔耦合的初步计算结果。
     本论文的成果在于:
     1、进一步完善了侧边抛磨光纤器件的光学模型,提出了更接近于实际侧边抛磨光纤的带过渡区的光学模型,并用三维的有限差分光束传输法进行了计算分析。
     2、基于带过渡区的侧边抛磨光纤模型,计算分析了侧边抛磨光纤波导的模场分布和光功率传输特性,计算了侧边抛磨光纤器件的光功率传输特性随其结构参数、涂覆聚合物材料尺寸和输入光波长变化的情况。
All optical fiber devices based on side-polished fiber (SPF) have attracted a lot of attention in every kind of optical devices. Not only in lab research but also in commercial communications, they are made for optical fiber communication and sensor. They have small size ,high integration and are easy to be fused with optical fiber.
     The SPF devices need more experimental verification work of contrast and and modification to get better results without theoretical calculation supporting. Simulation analysis may be convenient to change each parameter and come to conclusions that referred to real experiments directly.
     Considering the D-type fiber boundary condition of SPF, the model of SPF waveguide with polished transition region was put forward. The previous simulation results of side-polished fiber without polished transition region were improved, and new model of side-polished fiber with polished transition region were built, which is more similar to the shape of SPF. Three-dimensional finite-difference beam propagation method was used to compute and analyz the relation between the performance of optical power in SPF with or without polished transition region and some parameters of side polished area, such as the polished length, the thickness of residual cladding of side-polished fiber, wavelength and dimension of polymer overlaid on the polished surface. The results has provided theoretical knowledge for the experimental research of side-polished fiber and related devices.
     A preliminary analysis of the micro-ring resonator coupling with side-polished fiber was given. The coupling theory was used for micro-ring resonator and side-polished fiber. The design of simulation modle was made exploringly for the micro-ring resonator. The preliminary simulation result of micro-ring resonator coupling with SPF was obtained by finite difference time domain method.
     Achievements in the study are as follows:
     1、The optical model of SPF was further improved. New model of SPFwaveguide with polished transition region was put forward, which was more similar to SPF. Calculation and analysis were made by three-dimensional finite-difference beam propagation method.
     2、Based on the model of SPF waveguide with polished transition region, themode field of SPF, optical power transmission characteristics and the relation between the performance of optical power in SPF and some parameters of side polished area, such as the dimension of SPF, dimension of dimension of polymer overlaid on the polished surface and wavelength of light.
引文
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