Instrumentation, Techniques, and Measurement

Coherent optical time domain reflectometry by logarithmic detection and timed random frequency hopping

[+] Author Affiliations
Lidong Lu, Xiaoyan Sun, Xiande Bu, Binglin Li

Global Energy Interconnection Research Institute, State Grid Corporation of China, Nanjing, China

State Grid Laboratory of Electric Power Communication Network Technology, Nanjing, China

Opt. Eng. 56(2), 024106 (Feb 22, 2017). doi:10.1117/1.OE.56.2.024106
History: Received August 15, 2016; Accepted February 6, 2017
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Abstract.  A scheme using timed random frequency hopping and signal logarithmic mean method is proposed and experimentally demonstrated in a coherent optical time domain reflectometry (OTDR) system to reduce the fading noise of the OTDR trace and simplify the signal processing procedure. The timed random frequency hopping is realized by randomly changing the driving current of the laser at certain time points. By this method, the fading noise of OTDR trace can be reduced to be 1/5 of that without using it. Also, a radio frequency power detector (RFPD), whose output voltage has linear relationship with the input logarithmic RF power, is used to extract the power of the RF signals from the balanced photodetector. Then, a data acquisition card directly captures and adds the digital voltage signals from the RFPD to reduce the fading noise and improve the measurement dynamic range. Compared with synchronous and asynchronous frequency hopping scheme, the proposed method is of high efficiency.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Lidong Lu ; Xiaoyan Sun ; Xiande Bu and Binglin Li
"Coherent optical time domain reflectometry by logarithmic detection and timed random frequency hopping", Opt. Eng. 56(2), 024106 (Feb 22, 2017). ; http://dx.doi.org/10.1117/1.OE.56.2.024106


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