Method and evaluation device for mode group delay characteristic evaluation of optical fiber

摘要

The present disclosure is intended to provide a mode group delay characteristic evaluation method and an evaluation apparatus for evaluating mode group delay characteristics of a few mode fiber using a fiber parameter obtained in a simpler manner than group delay characteristics.The present disclosureMode group delay characteristic evaluation method to evaluate mode group delay characteristics of optical fiber under test.If the refractive index difference between the core and the cladding is small, thenAn approximate solution of the mode group delay characteristics of the tested optical fiber is the group index of the core.Clad group refractive indexBased on the derivation of the normalized frequency and normalized propagation constant.This method is a mode group delay characteristic evaluation method having a mode group delay calculating procedure for calculating a mode group delay characteristic of the propagation mode in the optical fiber to be tested.Diagram