CO 2 laser-induced long-period fibre gratings:spectral characteristics, cladding modes and polarisation independence

Abstract
Narrow band, large dynamic range, polarisation independent spectral resonances of long-period fibre gratings fabricated period-by-period with focused CO2 laser pulses are demonstrated at 1490 and 1538 nm. The observed cladding mode near field patterns in this wavelength range are presented.

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