Optical domain despreading method of optical time-domain reflectometer using spread spectrum technology

2021 ◽  
Vol 60 (05) ◽  
Author(s):  
Fang Zhang ◽  
Hongling Zhang ◽  
Peng Zhang ◽  
Yuefeng Qi ◽  
Wei Li
Keyword(s):  
Time Domain ◽  
Spread Spectrum ◽  
Optical Time Domain Reflectometer ◽  
Optical Domain ◽  
Optical Time ◽  
Time Domain Reflectometer

scholarly journals Fiber cavity ring-down using an optical time-domain reflectometer

2014 ◽  
Vol 4 (4) ◽  
pp. 295-299 ◽  
Author(s):  
D. J. Passos ◽  
S. O. Silva ◽  
J. R. A. Fernandes ◽  
M. B. Marques ◽  
O. Frazão
Keyword(s):  
Time Domain ◽  
Optical Time Domain Reflectometer ◽  
Optical Time ◽  
Time Domain Reflectometer ◽  
Cavity Ring Down

Measurement facility for the evaluation of the backscattering in fiber: Realization of an OTDR operating at single photon level

2014 ◽  
Vol 12 (02) ◽  
pp. 1461014 ◽  
Author(s):  
Fabrizio Piacentini ◽  
Alice Meda ◽  
Paolo Traina ◽  
Hong Kee Suk ◽  
Ivo Pietro Degiovanni ◽  
...  
Keyword(s):  
Optical System ◽  
Time Domain ◽  
Single Photon ◽  
Measurement Facility ◽  
Optical Link ◽  
Avalanche Photodetectors ◽  
Optical Time Domain Reflectometer ◽  
Free Running ◽  
Optical Time ◽  
Time Domain Reflectometer

This paper presents the INRIM effort related to the implementation of an optical time domain reflectometer (OTDR) that exploits backscattered light to test an optical fiber operating at single photon level, using two different avalanche photodetectors: a free-running Id220 and a gated Id201. Our tests show that the use of the Id220-based OTDR could be very helpful for QKD application, since it allows testing much longer portions of an optical link. This represents a great advantage for QKD systems, where single components and connections are often embedded in a non-separable optical system.

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