过去几年里,光导纤维模间色散引起了人们对光导纤维折射率分布特性和特殊光导纤维元件如模间耦合器的兴趣。光学色散测量技术中最引人注意的是干涉技术,干涉技术中,可以测得作为延迟一定波长范围的函数的干涉仪输出信号,干涉仪的延迟变化使输出信号产生一个振荡分量,该分量 In the past few years, the dispersion between optical fiber modules has drawn people’s interest in the refractive index distribution characteristics of optical fibers and special optical fiber components such as an inter mode coupler. Of most interest in optical dispersive measurement techniques is interferometry, in which interferometric output signals can be measured as a function of the delay over a range of wavelengths, the delay variation of the interferometer producing an oscillatory component of the output signal,