Abstract

The construction of fiber Bragg grating (FBG) unit is of great technological importance for various distributed remote sensing applications. A major challenge is the effective suppression of its temperature sensitivity without the additional complex structure or back-end calculation. Here we present a topological engineering strategy for notably reducing the temperature sensitivity of FBG in multicomponent glass system. The theoretical analysis indicates that the temperature insensitive FBG unit can be realized via introduction of self-compensation mechanism, based on combination of the positive thermal expansion and negative thermal-optic effect. Guided by the theory analysis, two typical multicomponent glass fibers are constructed and FBG is inscribed by femtosecond laser into the fiber core. Sensing tests show that the lowest temperature sensitivity of the fiber reaches to ∼8.3 pm/ °C, which is low than that of the standard commercial device (∼13.7 pm/ °C). The findings described here suggest an attractive opportunity to constructing new class of fiber probe with controllable optical response by topological engineering in multicomponent glass.

Temperature insensitive fiber interferometry

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OSA Continuum 3(12) 3468-3481 (2020)