| In this dissertation, a new class of measuring techniques for non-destructive spatial mapping of fiber physical parameters was developed and experimentally verified. The proposed method is based on selective localization of four-photon mixing (FPM) obtained by power transfer between the counter-colliding pulses and provides at least one order of magnitude increase in spatial resolution over comparable methods.;The technique was applied to retrieve geometrical, dispersive, stress, and birefringent properties of distributed fiber devices with meter-scale spatial resolution. The method is capable of resolving fluctuations in fiber transversal geometry comparable to a silica molecular diameter. |
