Technological Advantages
International leading quantum cryptography communication technology with interference immunity
1. Stability: Realized complete disturbance immunity of line 0-1KHz
This scheme performs excellent in optical cable tests, such as test for embedded optical fiber, aerial optical cable, river-crossing railway bridge optical cable and so on, which is the core technology in dealing with complex optical fiber link environment.
Field test for aerial optical cable of electric power |
||
Electric test site in Chanping, Beijing |
polarization disturbance caused by breeze |
system stability |
![]() |
![]() |
![]() |
Test result:disturbance immunity of line 0-1KHz; category 1-12 strong and weak disturbance can be resisted, almost no disturbance to ±800KV high voltage. |
||
Test result on duct optical cable stability of Wuhu Yangtze River Railroad Bridge
Test result on duct optical cable stability of Wuhu Yangtze River Railroad Bridge:
Testing environment: The total length of the communication line is 69.7km, among with the length for the duct optical cable crossing Wuhu Yangtze River Railroad Bridge is 10.6km;
Test on Wuhu Yangtze River Bridge both for highway and railroad
Image of Wuhu Yangtze River Bridge
Testing time:> 5000 hours;
testing result: bit error of useful signal secularly stabled below 2%;
Security: unidirectional transmission technology and active phase modulation technology.
2. Summary on actual securities of quantum cryptography
• There is always security issues in any actual system, so does quantum cryptography;
• The security flaws of receiving terminal is bigger than transmitting terminal;
• The security of reciprocating system is obviously weak than unidirectional system;
• In principle, security of single detector system is strong than double detector system;
• single laser is more secure than multi-laser;
• Active device is more secure than passive device.