title: Supermode Bragg grating combined Mach-Zehnder interferometer for temperature-strain discrimination.
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 LP01-like supermodes and the Mach-Zehnder interference works between a LP01-like supermode and LP01 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.
authors.forename: Zhifang
authors.initials: Z
authors.lastname: Wu
authors.forename: Hailiang
authors.initials: H
authors.lastname: Zhang
authors.forename: Perry Ping
authors.initials: PP
authors.lastname: Shum
authors.forename: Xuguang
authors.initials: X
authors.lastname: Shao
authors.forename: Tianye
authors.initials: T
authors.lastname: Huang
authors.forename: Ying Ming
authors.initials: YM
authors.lastname: Seow
authors.forename: Yan-ge
authors.initials: YG
authors.lastname: Liu
authors.forename: Huifeng
authors.initials: H
authors.lastname: Wei
authors.forename: Zhi
authors.initials: Z
authors.lastname: Wang