Strain and temperature characterization of LPGs written by CO₂ laser in pure silica LMA photonic crystal fibers

Abstract

This paper reports on the writing of long period gratings (LPGs) in a six-ring pure silica solid core, and large mode area photonic crystal fiber (fiber core diameter ρ = 10.1 μm) using a CO₂ laser system, and the characterization of their strain and temperature sensitivities. Temperature and strain sensitivities in the order of −19.6 pm/°C and −88 pm/μɛ, respectively, were obtained, which were comparable or surpassed values of the similar photonic crystal fiber (PCF)-based LPG or sensor configurations found in the literature.

Keywords

Long period grating / photonic crystal fiber / CO₂ laser

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