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The paper presents the technology and testing measurements of Mach–Zehnder interferometer made by K–Na ion exchange in glass. As a splitter and coupler of measuring and reference arms we used gradient index multimode interference structures in symmetrical configuration. The investigated interferometer, working in asymmetrical configurations, registers the phase shifts resulting from the changes of refractive index of the cover of both interferometer arms.

Mach-Zehnder Interferometer on the Base of Gradient Index Multimode Interference Structures