Acta Metrologica Sinica  2015, Vol. 36 Issue (1): 10-13    DOI: 10.3969/j.issn.1000-1158.2015.01.03
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Precise Measurement Method of Optical Fiber Length
ZHANG Ying-yan,SUN Xiao-qiang,FU Dong-bo,YUE Lei,LIU Li,LI Ran,YANG Kun
Telecom Technology Lab, China Academy of Telecommunication Research, Ministry of Industry and Information Technology, Beijing 100191, China
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Abstract   A precise and dead-zone-free method of optical fiber length measurement was proposed based on Gaussian optical pulses delay technique.Using optical fiber delay loop, two Gaussian pulses sequences with relative delay were observed in the high-speed oscilloscope.The two Gaussian pulses coincided with each other by adjusting the pulses frequency, and the optical fiber length could be calculated by the frequency.Frequency measurement errors would be induced if the two Gaussian pulses coincided incompletely.Complete coincidence could be judged by measuring the maximum amplitude according to delay-to-amplitude conversion. The frequency resolution achieved 0.1 Hz leading to high measurement accuracy. Experimental results showed that the uncertainty was 0.04 m for 2284.34 m G.652 single mode fiber (SMF), and 0.24 m for 12726.57 m SMF when wavelength of the optical source was 1296 nm.
Key wordsMetrology      Fiber length      Gaussian pulse      Delay time      Pulse frequency     
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ZHANG Ying-yan
SUN Xiao-qiang
FU Dong-bo
YUE Lei
LIU Li
LI Ran
YANG Kun
Cite this article:   
ZHANG Ying-yan,SUN Xiao-qiang,FU Dong-bo, et al. Precise Measurement Method of Optical Fiber Length[J]. Acta Metrologica Sinica, 2015, 36(1): 10-13.
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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2015.01.03     OR     http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2015/V36/I1/10
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