US 12,123,802 B2
Method for measuring light transmission medium, device for measuring light transmission medium, program for measuring light transmission medium, and recording medium
Koji Takahashi, Hamamatsu (JP); and Ryu Niigaki, Hamamatsu (JP)
Assigned to HAMAMATSU PHOTONICS K.K., Hamamatsu (JP)
Appl. No. 17/768,507
Filed by HAMAMATSU PHOTONICS K.K., Hamamatsu (JP)
PCT Filed Nov. 19, 2020, PCT No. PCT/JP2020/043239
§ 371(c)(1), (2) Date Apr. 13, 2022,
PCT Pub. No. WO2021/131442, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-239541 (JP), filed on Dec. 27, 2019.
Prior Publication US 2024/0094087 A1, Mar. 21, 2024
Int. Cl. G01M 11/00 (2006.01)
CPC G01M 11/33 (2013.01) 16 Claims
OG exemplary drawing
 
1. A light transmission medium measurement method for measuring a nonlinear coefficient and a wavelength dispersion value of a light transmission medium, the method comprising:
performing a measured value acquisition of performing, using at least one light source optically coupled to a light transmission medium, a plurality of light inputs with the same center wavelength and different properties to the light transmission medium, and acquiring, using at least one light detector optically coupled to the light transmission medium, a measured value of an intensity spectrum of each of a plurality of light outputs from the light transmission medium respectively corresponding to the plurality of light inputs;
performing an error calculation of calculating an error between the measured value and an estimated value of the intensity spectrum calculated based on a theoretical relation between an intensity spectrum and a phase spectrum of each of the plurality of light inputs, the nonlinear coefficient and the wavelength dispersion value of the light transmission medium, and the intensity spectrum of each of the plurality of light outputs while changing the nonlinear coefficient and the wavelength dispersion value; and
performing a parameter determination of determining the nonlinear coefficient and the wavelength dispersion value of the light transmission medium based on a difference, in a relation between the nonlinear coefficient and the wavelength dispersion value and the error, between the plurality of light inputs caused by a difference in the property.