Method for measuring light physical constants and device for estimating light physical constants

Abstract

A method for measuring light physical constants includes a dividing step (S106) of setting a plurality of first segments by dividing, virtually, an optical transmission medium along the direction of propagation, and a first estimating step (S108 - S114) of estimating the light physical constants for the plurality of first segments on the basis of a first propagation simulation result by way of a model for which input optical signals having various intensities are propagated in order in the plurality of first segments. For the first estimating step, the light physical constants for the plurality of first segments are estimated by performing a search for the light physical constants for the plurality of first segments using an evaluation function that evaluates the difference between a power spectrum of a measured output optical signal and a power spectrum of an output optical signal obtained as the result of the first propagation simulation result.

Description

technical field [0001] The present invention relates to a method of estimating the distribution of photophysical constants of an optical transmission medium. Background technique [0002] In the field of optical communication, the optical physical constants of the optical transmission medium (for example, nonlinear optical constants or dispersion parameters, etc.) affect the transmission characteristics of optical signals. Then, a method of measuring the photophysical constant of an optical transmission medium has been proposed (for example, refer to Non-Patent Document 1). [0003] (Prior art literature) [0004] (non-patent literature) [0005] Non-Patent Document 1: Toshiharu Yukita, Atsushi Honda, "User Engineer's Guide to Optical Measuring Instruments", OPTRONICS Corporation, 1999, pp.102-126 [0006] Summary of Invention [0007] Invention to solve problem [0008] However, in the above-mentioned conventional method, it is assumed that the optical physical constan...

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Problems solved by technology

[0008] However, in the above-mentioned conventional method, it is assumed that the optical physical constant is measured under the premise that the optical physical constant of the optical transmission medium is constant, so it is difficult to obtain the optical physical constant depending on the position of the optical transmission medium, in other words, to obtain the distribution of the optical physical constant is difficult

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