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We demonstrate miniature Mach-Zehnder-interferometer with a device length of 179.5 μm using two micro-abrupt-tapers in a cladding-depressed strongly-guiding fiber. The index variation of 2×10−3 from a 6.3 picoliter optical liquid can cause 1.6 nm wavelength-shift.
We demonstrate tunable Mach-Zehnder interferometer with an extinction ratio of above 31.6 dB through interference between core and cladding modes using two adjacent nonadiabatic tapers in a short length (<;; 13 mm) of highly Er/Yb co-doped fiber.
A differential gain-dependent phase shift between the core- and cladding-mode can be efficiently and all-optically tuned by a cw 975nm pump light for Mach-Zehnder interferometers using successive abrupt fiber tapers on a 1.2-cm-long Er/Yb-codoped fiber.
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