A simple analysis is presented for calculating the change in the effective index of a guided mode in an optical fiber with reduced cladding surrounded by an optically nonlinear medium. Using first-order perturbation theory, the optical power required to alter the phase-matched condition in a fiber directional coupler incorporating a nonlinear medium is therefore calculated. This may then be applied to an optically controlled switch, the output of which may be transferred from one port to another by application of a high-intensity pulse. This method may be applied to other fiber components, for example, fiber gratings and polarizers.
© 1986 Optical Society of America
Original Manuscript: March 24, 1986
Manuscript Accepted: June 6, 1986
Published: August 1, 1986
D. F. Clark, I. Andonovic, and B. Culshaw, "Perturbation analysis for the design of an optically controlled fiber-optic directional coupler," Opt. Lett. 11, 540-542 (1986)