Title:
SYSTEM AND METHOD FOR POLARIZATION CONTROL BASED ON STRAIGHT WAVEGUIDE MODULATOR, AND QUANTUM KEY DISTRIBUTION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/083034
Kind Code:
A1
Abstract:
The present invention discloses a polarization control system and method, and a quantum key distribution system. According to the method of the present invention, a first electro-optic crystal and a second electro-optic crystal are used sequentially to perform phase modulation on signal light, wherein the signal light is propagated in the first electro-optic crystal as a horizontal polarized light component and a vertical polarized light component of ordinary light and extraordinary light, respectively, and the signal light is propagated in the second electro-optic crystal as extraordinary light and ordinary light. Modulated electric fields in the first electro-optic crystal and the second electro-optic crystal are both parallel to the polarization direction of the ordinary light or the extraordinary light in the corresponding electro-optic crystal, and have the same size; however, the directions of the modulated electric fields are opposite with respect to the direction of a straight line indicated by the polarization direction of the ordinary light or the extraordinary light in the corresponding electro-optic crystal. Thus, the polarization state of final signal light can be conveniently controlled by controlling a modulated electric field.
More Like This:
Inventors:
XU MULAN (CN)
SUN YUANYUAN (CN)
TANG YANLIN (CN)
SUN YUANYUAN (CN)
TANG YANLIN (CN)
Application Number:
PCT/CN2019/110516
Publication Date:
April 30, 2020
Filing Date:
October 11, 2019
Export Citation:
Assignee:
QUANTUMCTEK CO LTD (CN)
International Classes:
H04L9/08
Domestic Patent References:
| WO2013009161A1 | 2013-01-17 |
Foreign References:
| CN107872314A | 2018-04-03 | |||
| CN103475425A | 2013-12-25 | |||
| CN106850194A | 2017-06-13 | |||
| JP5487426B2 | 2014-05-07 |
Other References:
XU, MULAN ET AL.: "Quantum Secret Communication Experiment Based on BB84 Protocol", PHYSICS EXPERIMENTATION, vol. 34, no. 11, 20 November 2014 (2014-11-20), DOI: 20191226093356A
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
Download PDF: