Abstract
The significance of full vectorial pulse propagation through emerging waveguides has not been investigated. Here we report the development of a generalised vectorial model of nonlinear pulse propagation due to the effects of Stimulated Raman Scattering (SRS) in optical waveguides. Unlike standard models, this model does not use the weak guidance approximation, and thus accurately models the modal Raman gain of optical waveguides in the strong guidance regime. Here we develop a vectorial-based nonlinear Schrödinger Eq. (VNSE) to demonstrate how the standard model fails in certain regimes, with up to factors of 2.5 enhancement in Raman gain between the VNSE and the standard model. Using the VNSE we are able to explore opportunities for tailoring of the modal Raman gain spectrum to achieve effects such as gain flattening through design of the optical fiber.
Highlights
The growing interest in optical waveguides with high nonlinearity [1,2,3,4] and specific dispersion characteristics [5,6,7,8] has led to the development of emerging waveguides [1] that contain inhomogeneous and complex transverse structure [8, 9], subwavelength inclusions [9,10,11] and high refractive index contrast
Based on the developed vectorialbased nonlinear Schrödinger Eq. (VNSE), we investigate the impact of Ez on Stimulated Raman Scattering (SRS), and show that it can effect the calculations for the modal Raman gain, especially in the regime of high index and subwavelength structured waveguides
To show the significance of this effect on Raman gain, we numerically model the effective area, ḡR and g(m−1W −1 ) of a chalcogenide nanowire for a range of core diameters to observe in which regimes differences between the VNSE and standard model (SM) can be significant
Summary
Mark Daniel; Monro, Tanya Mary; Afshar Vahid, Shahraam. A full vectorial model for pulse propagation in emerging waveguides with subwavelength structures part II: Stimulated Raman Scattering, Optics Express, 2009; 17(14):11565-11581. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=oe-17-14-11565. OSA grants to the Author(s) (or their employers, in the case of works made for hire) the following rights:. (b)The right to post and update his or her Work on any internet site (other than the Author(s’). A full vectorial model for pulse propagation in emerging waveguides with subwavelength structures part II: Stimulated Raman Scattering.
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