Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Modulation instability in nonlinear positive–negative index couplers with saturable nonlinearity

Not Accessible

Your library or personal account may give you access

Abstract

We have investigated the modulation instability (MI) in a nonlinear optical coupler using a generalized model describing the pulse propagation of a waveguiding structure composed of two adjacent waveguides. The model consists of a nonlinear tunnel-coupled structure consisting of right- and left-handed media. The optical coupler considered here includes a local saturable nonlinear refractive index. In particular, we discuss the impact of the saturable nonlinearity for the MI of plane waves and formation of spatial solitons. The results show that MI can exist not only in the normal group velocity dispersion (GVD) regime but also in the normal GVD regime in the nonlinear positive-negative index coupler in the presence of saturable nonlinearity. The saturable nonlinearity can increase/decrease the number of sidebands or shift the existing sidebands. The maximum value of the MI gain, as well as its bandwidth, has been also affected by the saturable nonlinearity. Moreover, the saturable nonlinearity may influence considerably the number of wave trains induced by MI.

© 2012 Optical Society of America

Full Article  |  PDF Article
More Like This
Modulation instability in an array of positive- and negative-index waveguides

Lingling Zhang, Yuanjiang Xiang, Xiaoyu Dai, and Shuangchun Wen
J. Opt. Soc. Am. B 31(12) 3029-3037 (2014)

Modulation instability in the oppositely directed coupler with a quadratic nonlinearity

Jinggui Zhang, Xiaoyu Dai, Lifu Zhang, Yuanjiang Xiang, and Yongfan Li
J. Opt. Soc. Am. B 32(1) 1-8 (2015)

Modulational instability of copropagating light beams induced by cubic–quintic nonlinearity in nonlinear negative-index material

Rama Gupta, Thokala Soloman Raju, Choragudi Nagaraja Kumar, and Prasanta K. Panigrahi
J. Opt. Soc. Am. B 29(12) 3360-3366 (2012)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (22)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved