Networking and Communication Engineering

M. Lotfy Rabeh ¹, M. Mohanna ², Tarek Hosny ³, Mohamed I. Gabr ³

Affiliations
1 Department of Electrical Engineering, Benha University, Cairo, EG
2 National Research Institute of Astronomy and Geophysics, Cairo, EG
3 Department of Electrical Engineering, Al-Safwa High Institute of Engineering, Cairo, EG

Abstract

In this paper we propose a new technique for optical wavelength demultiplexing (DEMUX) relaying on two phenomena: Goos-Haenchen (GH) shift and continuous refraction at a graded-index medium interface. IN the first case, two light beams are totally reflected at a plane interface separating two dielectric lossless media. The reflected beams suffer different lateral shifts (GH shifts) which depend on the wavelength; thus accomplishing the required spatial beam separation. In the second case, the two light beams have different “turning points” inside the graded index medium; hence the “back-refracted” beams are spatially separated. In this paper, we optimized the conditions of operation of such demultiplexing technique. This makes possible the integration of such technique in “planer integrated-optics” structures which can be used reliably in optical fiber communication networks.

Keywords

Wavelength Demultiplexing, Beam Propagation Method, Graded-Index Interface.

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Mohamed I. Gabr ¹, Tarek Hosny ¹

Affiliations
1 Department of Electrical Engineering, Al-Safwa High Institute of Engineering, Cairo, EG

Abstract

This paper explores spatial wavelength division de-multiplexing for a two different wavelengths using fast Fourier transfer Beam Propagation Method (FFT-BPM). The FFT-BPM method is implemented in MAT-LAB to simulate the refracted and reflected  beams in the rarer and denser media respectively and investigate the de-multiplexing phenomena.

Keywords

Wavelength Demultiplexing, Fast Fourier Transform Beam Propagation Method, Rarer and Denser Mediums.

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