Modulational instability in one-dimensional saturable waveguide arrays: Comparison with Kerr nonlinearity

Publication date
2006-11
Document type
Research article
Author
Stepić, Milutin
Rüter, Christian E.
Maluckov, Aleksandra
Hadžievski, Ljupčo
Organisational unit
Technische Universität Clausthal
DOI
URI
Scopus ID
ISSN
Series or journal
Optics Communications
Periodical volume
267
Periodical issue
1
First page
229
Last page
235
Part of the university bibliography
Nein
Abstract
Discrete modulational instability within the first band of uniform one-dimensional waveguide arrays possessing a saturable self-defocusing nonlinearity is investigated in detail within the coupled mode approach. Explicit analytical results for both the threshold and the maximal gain of instability are compared with the corresponding data from waveguide arrays exhibiting Kerr nonlinearity. We find that saturation bounds the interval of existence of discrete modulational instability, stabilizes the frequency region of perturbations around ±π/2 and decreases both gain and critical spatial frequency of perturbations. © 2006 Elsevier B.V. All rights reserved.
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