Sensitivity of two core fiber coupling to light-induced defects

Permanent changes in the refractive index of a germania-doped silica core fiber nonlinear directional coupler exposed to 620-nm wavelength high-intensity 100-fs pulses are discussed. The index change, on the order of 10/sup -5/, is estimated from the detuning aspects of the coupler. Both the constraints and beneficial aspects of these defects for nonlinear optical devices are discussed.<
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