Abstract
Abstract A new type of fiber interferometer based on two short thin-core fiber insertions with a section of standard fiber in between is proposed. The thin-core fiber insertions excite cladding modes and provide energy exchange between different fiber modes. We have simulated and measured transmission through a single thin-core fiber section. The standard fiber section is used to accumulate phase differences between core and cladding modes propagating through the structure. Transmission spectra are measured for various lengths of the interferometer. Separate control of thin-core and standard fiber insertions adds flexibility in obtaining spectra desirable for sensing applications.
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