Abstract
A Mach-Zehnder interferometer constructed by femtosecond-laser written in-fiber waveguides in no-core fiber (NCF) is demonstrated. Such an interferometer device consists of a section of the NCF in which a waveguide has been inscribed, fusion spliced with single-mode fiber at its two ends. One of the interferometer arms is formed by the waveguide inscribed and the other follows the diverging light path inside the NCF before arriving at the end of single-mode fiber core. Such an internal structure-based device can be used not only for strain sensing but also for external refractive index measurement.
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