A new demodulation technique for optical fiber interferometric sensors with [3×3] directional couplers
Optical fiber interferometric sensors based on [3×3] couplers have been used in many fields. A new technique is proposed to demodulate output signals of this kind of sensors. The technique recovers the signal of interest by fitting coefficients of elliptic (Lissajous) curves between each fiber pair. Different from other approaches, this technique eliminates the dependence on the idealization of [3×3] coupler, provides enhanced tolerance to the variance of photoelectric converters, and is anti-polarization in a certain extent. The main algorithm has been successfully demonstrated both by numerical simulation and experimental result.
崔杰：Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080
陈德胜：Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080
肖灵：Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080
孙德兴：Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080
备注：This work was supported by the National Natural Science Foundation of China under Grant No.60673152. T. Liu’s e-mail address is email@example.com.
【1】Y. Jiang and S. Xiao, Journal of Test and Measurement Technology (in Chinese) 18, 200 (2004).
【2】Y. Jiang and T. Jiang, Opt. Technique (in Chinese) 30, 464 (2004).
【3】S. K. Sheem, Appl. Phys. Lett. 37, 869 (1980).
【4】S. K. Sheem, J. Appl. Phys. 52, 3865 (1981).
【5】S. K. Sheem, T. G. Giallorenzi, and K. Koo, Appl. Opt. 21, 689 (1982).
【6】R. G. Priest, IEEE J. Quantum Electron. 18, 1601 (1982).
【7】B. Jiao, Z. Wang, and S. Zheng, Laser & Infrared (in Chinese) 34, 298 (2004).
【8】K. P. Koo, A. B. Tveten, and A. Dandridge, Appl. Phys. Lett. 41, 616 (1982).
【9】R. M. Keolian, S. L. Garrett, and C. B. Cameron, “Demodulators for optical fiber interferometers with [3×3] outputs" US Patent 5,313,266 (May 17, 1994).
【10】Y. Jiang, Y. Lou, and H. Wang, Acta Photon. Sin. (in Chinese) 27, 152 (1998).
【11】Y. Jiang and S. Chen, Acta Opt. Sin. (in Chinese) 24, 1487 (2004).
【12】M. Ni, “Investigation of the key technologies of fiber optic hydrophone" PhD Thesis (Institute of Acoustics, CAS, 2003) PP.35-40
【13】J. Cui and L. Xiao, Technical Acoustics 25, (Suppl.) 511 (2006).
Tingting Liu, Jie Cui, Desheng Chen, Ling Xiao, Dexing Sun, "A new demodulation technique for optical fiber interferometric sensors with [3×3] directional couplers," Chinese Optics Letters 6(1), 12-15 (2008)