High-sensitivity dispersive Mach–Zehnder interferometer based on a dissimilar-doping dual-core fiber for sensing applications

摘要

A dual-core fiber in which one of the cores is doped with germanium and the other with phosphorus is used as an\udin-line Mach–Zehnder dispersive interferometer. By ensuring an equal length but with different dispersion dependencies\udin the interferometer arms (the two cores), high-sensitivity strain and temperature sensing are achieved.\udOpposite sensitivities for high and low wavelength peaks were also demonstrated when strain and temperature\udwas applied. To our knowledge this is the first time that such behavior is demonstrated using this type of in-line\udinterferometer based on a dual-core fiber. A sensitivity of 0.102 0.002 nm∕με, between 0 and 800 με and\ud −4.2 0.2 nm∕°C between 47°C and 62°C is demonstrated.