Title:
DEVICE FOR MEASURING DIFFERENCE IN INTER-SPATIAL CHANNEL PROPAGATION DELAY TIME AND METHOD FOR MEASURING DIFFERENCE IN INTER-SPATIAL CHANNEL PROPAGATION DELAY TIME
Document Type and Number:
Japanese Patent JP2018021890
Kind Code:
A
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
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Inventors:
ONO SINGO
KOMO KUNIHIRO
IIDA DAISUKE
MANABE TETSUYA
KOMO KUNIHIRO
IIDA DAISUKE
MANABE TETSUYA
Application Number:
JP2017017107A
Publication Date:
February 08, 2018
Filing Date:
February 01, 2017
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
G01J9/02; H04B10/073; H04J14/04
Domestic Patent References:
| JP2014153116A | 2014-08-25 |
Other References:
OPTICS EXPRESS, vol. 13, no. 25, JPN7020000029, 12 December 2005 (2005-12-12), pages 10040 - 10048, ISSN: 0004190792
OPTICAL FIBER TECHNOLOGY, vol. 40, JPN7020002349, January 2018 (2018-01-01), pages 56 - 61, ISSN: 0004321499
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, JPN6020029036, September 2016 (2016-09-01), pages 318, ISSN: 0004321500
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, JPN6020029035, 20 December 2016 (2016-12-20), pages 25, ISSN: 0004321501
OPTICAL FIBER TECHNOLOGY, vol. 40, JPN7020002349, January 2018 (2018-01-01), pages 56 - 61, ISSN: 0004321499
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, JPN6020029036, September 2016 (2016-09-01), pages 318, ISSN: 0004321500
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, JPN6020029035, 20 December 2016 (2016-12-20), pages 25, ISSN: 0004321501
Attorney, Agent or Firm:
Kenji Okada
Katsuhiro Imashita
Katsuhiro Imashita