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- Halting the fuse discharge propagation using optical fiber microwiresPublication . Rocha, A. M.; Fernandes, G.; Domingues, F.; Niehus, Manfred; Pinto, A. N.; Facão, M.; André, P. S.We report and analyze the halting of the fuse effect propagation in optical fiber microwires. The increase of the mode field diameter in the tapered region decreases the optical intensity resulting in the extinction of the fuse effect. This fiber element presents a low insertion loss and can be introduced in the optical network in order to protect the active equipment from the damage caused by the fuse effect.
- Theoretical analysis of multimodal four-wave mixing in optical microwiresPublication . Fernandes, Gil M.; Almeida, Alvaro J.; Niehus, Manfred; Pinto, Armando NolascoOptical fiber microwires (OFMs) are nonlinear optical waveguides that support several spatial modes. The multimodal generalized nonlinear Schrodinger equation (MM-GNLSE) is deduced taking into account the linear and nonlinear modal coupling. A detailed theoretical description of four-wave mixing (FWM) considering the modal coupling is developed. Both, the intramode and the intermode phase-matching conditions is calculated for an optical microwire in a strong guiding regime. Finally, the FWM dynamics is studied and the amplitude evolution of the pump beams, the signal and the idler are analyzed.