Ma Hai-Qiang(马海强)a)b), Zhao Jian-Ling(赵建领)b), and Wu Ling-An(吴令安)b)†
a School of Sciences, Beijing University of Posts and Telecommunications, Beijing 100876, China; b Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Abstract A new type of all-fibre Sagnac interferometer composed of two loops is proposed and analysed in detail. It can be used with a very long transmission line while maintaining excellent performance characteristics due to the automatic compensation of any birefringence effects in the trunk fibre. Preliminary experiments at 1310 nm wavelength with a 70 km long trunk fibre demonstrated an interference visibility as high as 98%, indicating that this scheme has promising potential applications.
Received: 23 February 2009
Revised: 17 March 2009
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 60578029, 10674174
and 10805006) and the National
Program for Basic Research in China (Grant No 2006CB921100).
Cite this article:
Ma Hai-Qiang(马海强), Zhao Jian-Ling(赵建领), and Wu Ling-An(吴令安) A dual-loop Sagnac interferometer 2009 Chin. Phys. B 18 2801
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