Research Articles

Investigation of the power coupling of novel wavelength-selective couplers incorporating axially symmetric long-period fibre gratings

Ronnie Kritzinger, Johan Meyer, Johan Burger
South African Journal of Science | Vol 107, No 5/6 | a400 | DOI: https://doi.org/10.4102/sajs.v107i5/6.400 | © 2011 Ronnie Kritzinger, Johan Meyer, Johan Burger | This work is licensed under CC Attribution 4.0
Submitted: 11 August 2010 | Published: 13 May 2011

About the author(s)

Ronnie Kritzinger, Department of Electrical and Electronic Engineering Science, University of Johannesburg, South Africa
Johan Meyer, Department of Electrical and Electronic Engineering Science, University of Johannesburg, South Africa
Johan Burger, National Metrology Institute of South Africa, South Africa

Abstract

Evanescent-field coupling was studied experimentally in novel optical-fibre-based wavelength-selective couplers, using axially symmetric long-period fibre grating (LPFG) structures. The coupling characteristics of a wavelength-selective coupler at the resonant wavelength were investigated for different LPFG offset distances. It was shown that the wavelength-selective couplers effectively transferred light power at the LPFG resonant wavelength from one fibre to another. The performance of the couplers was consistent with simulations performed in MATLAB using coupled-mode theory.

Keywords

evanescent-field coupling; wavelength-selective coupler; long-period fibre grating; coupling efficiency; multiplexer; fibre optics

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