Complete All-Optical Silica Fiber Isolator via Stimulated Brillouin Scattering

This study demonstrates the theoretical operation of an all-optical silica fiber isolator using stimulated Brillouin scattering. Two pump sources that copropagate through a double-mode fiber generate acoustic waves through electrostriction. These acoustic waves then induce unidirectional interband optical transitions between a separate pair of signal sources. With 1 W of total input pump power, complete optical isolation is achieved with a silica rod waveguide of radius 0.67 μm over a length of approximately 12 m, with pumps operating at a wavelength of 1.55 μm and signals at 1.50 μm.