US 12,463,724 B2
Multipath interference analysis device and multipath interference analysis method
Hiroki Kawahara, Musashino (JP); and Takeshi Seki, Musashino (JP)
Assigned to NTT, Inc., Tokyo (JP)
Appl. No. 18/556,434
Filed by NTT, Inc., Tokyo (JP)
PCT Filed Apr. 27, 2021, PCT No. PCT/JP2021/016829
§ 371(c)(1), (2) Date Oct. 20, 2023,
PCT Pub. No. WO2022/230061, PCT Pub. Date Nov. 3, 2022.
Prior Publication US 2024/0204873 A1, Jun. 20, 2024
Int. Cl. H04B 10/07 (2013.01); H04B 10/2581 (2013.01); H04B 10/69 (2013.01); G02B 6/028 (2006.01); H04B 10/25 (2013.01); H04B 10/2507 (2013.01)
CPC H04B 10/2581 (2013.01) [H04B 10/697 (2013.01); G02B 6/0288 (2013.01); H04B 10/07 (2013.01); H04B 10/25 (2013.01); H04B 10/2507 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A multipath interference analysis device comprising:
a statistical amount calculation unit, comprising one or more processors, configured to obtain a normal distribution of a cutoff wavelength through calculation of statistical amounts of average values and variance values of respective measurement values of splice loss and the cutoff wavelength measured from a plurality of optical fiber pieces each having a predetermined length for forming an optical transmission line;
a determination unit, comprising the one or more processors, configured to truncate the normal distribution of the cutoff wavelength at predetermined lower and upper limit values of the cutoff wavelength to determine a truncated normal distribution;
a random number generation unit, comprising the one or more processors, configured to generate random numbers for selecting a predetermined number of optical fiber pieces of splice connection targets forming the optical transmission line, on a basis of the determined truncated normal distribution; and
a multipath interference (MPI) value calculation unit, comprising the one or more processors, configured to calculate an MPI value in the optical transmission line formed of the predetermined number of optical fiber pieces selected according to the random numbers using a mode dependent loss in a fundamental mode and a splice interval of the optical transmission line, the MPI value being a value of multipath interference caused by the cutoff wavelength and the splice loss.