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楔形光纤(WSF)是实现平面光波光路芯片入出端口与光纤高效连接的核心部件.采用数值模拟方法分析其中光波传输演化过程,是优化设计光子器件耦合结构的重要基础.提出基于等效矩形近似的三维阶梯串联法(ERA-SCM),将楔端沿传输方向细分,引入矩形波导近似,给出了细分后各段近似矩形波导的等效折射率;在此基础上,建立了阶梯串联法分析模型,分级给出WSF中光波传输过程与模场演变.数值分析结果表明,ERA-SCM比有限差分束传播法(FD-BPM)能够更精确地分析非对称光纤和波导结构,描述其中光模场的演化.WSF出射光场实测结果表明,ERA-SCM数值模拟结果与实验结果的误差为1.9%,而FD-BPM的误差为4.5%.ERA-SCM是分析非对称光波导光波传输与模场演变的有效方法.
Wedge fiber (WSF) is the key component to realize the efficient connection between the optical fiber in and out port of the planar lightwave optical chip.It is an important foundation to optimize the coupling structure of photonic devices by numerical simulation of the light wave transmission evolution process.An equivalent rectangular approximation The three-dimensional ladder series method (ERA-SCM), the wedge end along the transmission direction subdivision, the introduction of rectangular waveguide approximation gives the subdivision of the approximate rectangular waveguide after the equivalent refractive index; on this basis, the establishment of the ladder series Method was used to classify the light wave propagation process and mode field evolution in WSF.The numerical results show that ERA-SCM can analyze asymmetric optical fiber and waveguide structures more accurately than FD-BPM, The evolution of optical mode field shows that the error of ERA-SCM numerical simulation results is 1.9% and the error of FD-BPM is 4.5% .ERA-SCM is an analysis of asymmetric optical waveguide optical transmission And mode field evolution effective method.