Numerical Analysis of an Optical X Coupler with a Nonlinear Dielectric Region

Hirohisa YOKOTA  Koichi KIMURA  Sadao KURAZONO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E78-C   No.1   pp.61-66
Publication Date: 1995/01/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Ultrafast Optoelectronics)
Category: 
Keyword: 
iterative FD-BPM,  nonlinear dielectrics,  optical coupler,  all-optical switching,  

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Summary: 
For an application to the optical signal processing devices, we propose the optical X coupler which consists of two bending waveguides and a nonlinear dielectric region. To analyze this structure accurately we utilized the iterative finite difference beam propagation method (iterative FD-BPM). In this paper the formulation of the iterative FD-BPM for one wave and two waves cases are presented, respectively. We investigate following two cases. First, we consider the case that the light is launched into one of the input ports. We calculate the evolutions of the field amplitude and the transmission characteristics for the input power. Second, we consider the case that the signal light with the constant power is launched into one of the input ports and that the control light with the wavelength different from that of the signal light is launched into another input port. We calculate the evolutions of the field amplitude and the transmission characteristics of the signal light for the power of control light. As a result of the analysis, we show that all-optical switching operation is possible in the proposed structure.