Department of Physics, Panjab University, Chandigarh, India

TPSC seminar

Time and date: 2 December 2011 (Friday), 4:00 PM
Venue: Seminar Hall

Title: Optical similaritons in a graded-index nonlinear-fiber amplifier with an external source

Speaker: Dr. Thokala Soloman Raju, Department of Physics, Karunya University, Coimbatore

Abstract: We analytically explore a wide class of optical similaritons to the nonlinear Schrödinger equation appropriately modified to model beam propagation in a tapered, graded-index nonlinear-fiber amplifier with an external source. Under certain physical conditions, we reduce the coupled nonlinear Schröedinger equations to single wave equation that aptly describes similariton propagation through asymmetric twin-core fiber amplifiers. The asymmetric twin-core fiber is composed of two adjoining, closely spaced, single mode fibers in which the active one is a tapered graded-index nonlinear-fiber and the passive one is a step-index fiber. We obtain these novel self-similar waves for different choices of tapered index profile, using a Mobius transformation. Our procedure is applicable both for self-focusing and self-defocusing nonlinearities.