Optical time domain backscattering of antiresonant hollow core fibers

被引:12
作者
Slavik, Radan [1 ]
Fokoua, Eric R. Numkam [1 ]
Bradley, Thomas D. [1 ,2 ]
Taranta, Austin A. [1 ]
Komanec, Matej [3 ]
Zvanovec, Stanislav [3 ]
Michaud-Belleau, Vincent [4 ]
Poletti, Francesco [1 ]
Richardson, David J. [1 ]
机构
[1] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England
[2] Eindhoven Univ Technol, Inst Photon Integrat, High Capac Opt Transmiss Lab, Eindhoven, Noord Brabant, Netherlands
[3] Czech Tech Univ, Fac Elect Engn, Prague 16627, Czech Republic
[4] Univ Laval, Ctr Opt Photon & Laser, Quebec City, PQ, Canada
基金
欧洲研究理事会; 英国工程与自然科学研究理事会;
关键词
17;
D O I
10.1364/OE.461873
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Today's lowest-loss hollow core fibers are based on antiresonance guidance. They have been shown both theoretically and experimentally to have very low levels of backscattering arising from the fiber structure - 45 dB below that of traditional optical fibers with a solid silica glass core. This makes their longitudinal characterization using conventional reflectometric techniques very challenging. However, it was recently estimated that when filled with air, their backscattering coefficient increases to about 30 dB below that of standard solid core fibers. This level should be measurable with commercially available high performance optical time domain reflectometers (OTDR). Here we demonstrate - for the first time to the best of our knowledge - the measurement of backscattering from the air inside a hollow core fiber. We show that the characterization of multi-km long hollow core fibers with 15 m spatial resolution is possible using a commercial OTDR instrument. To benefit from its full dynamic range, we strongly suppress the 4% back-reflections that ordinarily occur at the OTDR's standard fiber output when directly-connected to a hollow core fiber. Furthermore, low coupling loss into the hollow core fiber (0.3 dB in our experiment) also helps to maximize the achievable OTDR signal-to-noise ratio. This approach enables distributed characterization and fault-finding in low-loss hollow core fibers, a topic of increasing importance as these fibers are now starting to be installed in commercial optical communication networks. Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License.
引用
收藏
页码:31310 / 31321
页数:12
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