Femtosecond inscription and thermal testing of Bragg gratings in high concentration (40 mol%) Germania-doped optical fibre

Abstract

“Using point-by-point infrared femtosecond laser inscription, a fibre Bragg grating with a resonance wavelength of 1550.28±0.02 nm, 25 dB extinction ratio and 1.10±0.02 nm bandwidth (measured at first minima) was inscribed in a high concentration (40 mol%) germania-doped silica fibre.” At this wavelength, the high concentration germania doped silica fibre had a normalized frequency V ≃ 3.06 permitting higher order mode propagation. Subsequently, two additional Bragg resonances were recorded at 1534.40±0.02 and 1535.78±0.02 nm corresponding to the coupling of the forward propagating fundamental mode and counter propagating HE21 and TM01/TE01 respectively. Thermal tests revealed the grating was stable up to 800 °C for 30 minutes. Analysis determined the grating had first and second order coefficients dλB/dT = 11.1 pm/°C and d2λB/dT² = 8.37×10^-3 pm2/°C² respectively.

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