Compositional dependence of the temperature sensitivity in a long period grating imprinted on GeO2-B2O3 co-doped core silica fibers
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In long period fiber gratings (LPFG), the fundamental guided core mode (LP01) is coupled to forward propagating cladding modes (LP0m) [1].
[1] John E. Sipe,et al. Long-period fiber gratings as band-rejection filters , 1995 .