摘要
本文利用数值仿真研究了少模光纤干涉仪中少模光纤与单模光纤的对准偏差对调制深度的影响.基于阶跃折射率光纤的矢量波动方程,数值求解导模的场分布.按无对准偏差时对光纤参数进行优化,使调制深度达到1.数值仿真了单模光纤偏心激励少模光纤情况下,少模光纤中的模式功率分布.仿真结果表明可用光功率检测的方法辅助少模光纤和单模光纤对准熔接,当光功率控制在极小值2%范围内时,横向对准偏差小于3微米.论文仿真了少模光纤干涉仪中光纤熔接对准误差与调制深度的关系.结果表明,当对准偏差小于3μm时,调制深度大于96%;当对准偏差大于4μm后,调制深度随对准偏差的增大而急剧减小.
Few-mode fiber(FMF)interferometer is numerically studied.Vector eigen-modes of step-index fiber were solved numerically.The parameters of FMF interferometer were optimized to let DM=1,under condition of no misalignment.Modal power distribution of FMF under offset-launching by single mode fiber(SMF)was calculated.The result indicates that the SMF to FMF offset can be controlled within 3 micron by monitoring the total guided power in FMF while launching an incoherent light from SMF into FMF.Influence of misal...
出处
《电子器件》
CAS
2007年第2期600-603,共4页
Chinese Journal of Electron Devices
关键词
少模光纤
干涉仪
调制深度
对准偏差
few-mode fiber
interferometer
depth of modulation
misalignment
