Supermode Bragg grating combined Mach-Zehnder interferometer for temperature-strain discrimination

Optics Express
Zhifang WuZhi Wang

Abstract

We report on a compact sensor by integrating a Mach-Zehnder interference and a cladding Bragg grating in a same section of all-solid photonic bandgap fiber. Theoretical investigation reveals that the Bragg grating resonance stems from the coupling of counter-propagating cladding LP<sub>01</sub>-like supermodes and the Mach-Zehnder interference works between a LP<sub>01</sub>-like supermode and LP<sub>01</sub> core mode. Compared with the interference fringe, such supermode grating dip responses to axial strain in a more sensitive and opposite-direction manner. Whereas, the interference fringe shows a higher temperature sensitivity than the supermode grating dip. By means of these different responses, this device finds a useful application in the discrimination of temperature and axial strain.

References

Jan 18, 2003·Science·Philip Russell
Nov 10, 2004·Optics Letters·F LuanP St J Russell
Apr 6, 2007·Optics Letters·Guobin RenJie Luo
Apr 4, 2005·Optics Express·A ArgyrosP St J Russell

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