Abstract

Novel V-groove all-fiber core-cladding intermodal interferometers fabricated by ${\mathrm{CO}}_2$ laser irradiation on a standard single-mode fiber are described. The high-order cladding modes are excited due to the special V-groove structure. The interferometers are classified as Mach–Zehnder and Michelson type based on the way they are structured. Benefiting from the large difference of thermal coefficients of the core and high-order cladding modes, both types receive high temperature sensitivity by monitoring the wavelength shift of the interference spectrum, and their responses to temperature are similar. Compared with the Mach–Zehnder interferometer, the Michelson interferometer is more compact and more flexible in application.

© 2015 Optical Society of America

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