Title:
空間チャネル間伝搬遅延時間差測定装置及び空間チャネル間伝搬遅延時間差測定方法
Document Type and Number:
Japanese Patent JP6751362
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a device for measuring a difference in inter-spatial channel propagation delay time and a method for measuring a difference in inter-spatial channel propagation delay time having a high resolution in a limited optical band.SOLUTION: A device for measuring a difference in inter-spatial channel propagation delay time according to the present invention is constituted to sweep the optical frequency of a light source per spatial channel and generate a beat signal with local light, and divide a beat frequency difference analyzed from a temporal change rate of phase difference of the beat signal by a frequency sweep speed, thereby measuring a difference in inter-spatial channel propagation delay time. Since a conventional FMCW method involves doing frequency analysis from Fourier transformation, it is impossible to analyze such a small propagation delay time difference as a 2π or larger beat signal phase difference would not occur within a measurement time for reasons of the frequency resolution of Fourier transformation. By contrast, as the present invention finds a propagation delay time difference directly from the beat signal phase difference, it is possible to make analysis even when the beat signal phase difference is 2π or less.SELECTED DRAWING: Figure 5
Inventors:
Ohno Makigo
Kunihiro Touge
Daisuke Iida
Tetsuya Manabe
Kunihiro Touge
Daisuke Iida
Tetsuya Manabe
Application Number:
JP2017017107A
Publication Date:
September 02, 2020
Filing Date:
February 01, 2017
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G01J9/02; H04B10/073; H04J14/04
Domestic Patent References:
| JP2014153116A |
Other References:
OPTICS EXPRESS,2005年12月12日,Vol.13 No.25,p.10040~10048
Optical Fiber Technology,2018年 1月,Vol.40,p.56~61
2016年電子情報通信学会通信ソサイエティ大会講演論文集2,(社)電子情報通信学会,2016年 9月,p.318
第30回 光通信システムシンポジウム プログラム&講演予稿集,(社)電子情報通信学会 光通信システム研究専門委員会,2016年12月20日,p.25
Optical Fiber Technology,2018年 1月,Vol.40,p.56~61
2016年電子情報通信学会通信ソサイエティ大会講演論文集2,(社)電子情報通信学会,2016年 9月,p.318
第30回 光通信システムシンポジウム プログラム&講演予稿集,(社)電子情報通信学会 光通信システム研究専門委員会,2016年12月20日,p.25
Attorney, Agent or Firm:
Kenji Okada
Katsuhiro Imashita
Katsuhiro Imashita