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Design of compact mode splitters using identical coupled waveguides with slots

Hada, S. L. and Rahman, B. M. A. ORCID: 0000-0001-6384-0961 (2019). Design of compact mode splitters using identical coupled waveguides with slots. OSA Continuum, 2(3), pp. 848-861. doi: 10.1364/OSAC.2.000848

Abstract

In the past, multimode transmission through fibers has not been considered a preferred means of signal propagation due to the intermodal dispersion, which limits the data rate. However, recently, there has been an interest in using different modes as individual channels to increase the overall data rate. However, the challenging task in implementing such a system is that each individual mode has to be excited separately without mixing, and these should remain separated even at the bents and splices, and finally, they need to be collected separately. In this paper, design and optimization of a compact optical mode splitter by introducing a small slot in a silicon nanowire waveguide is demonstrated by employing a full-vectorial finite element method. The authors report here that by creating a slot within a waveguide, the desired coupling length ratio of 1:2 between the fundamental and the second modes can be obtained. The waveguide junctions have also been analyzed by using a rigorous least squares boundary residual method to study power transfer efficiency and effect of fabrication tolerances.

Publication Type: Article
Additional Information: © 2019 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Publisher Keywords: Bend loss, Optical directional couplers, Signal processing, Single mode fibers, Slot waveguides, Space division multiplexing
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Electrical & Electronic Engineering
Date Deposited: 03 Nov 2020 15:16
URI: https://openaccess.city.ac.uk/id/eprint/24862
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