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International Journal of Optics
Volume 2010, Article ID 601675, 7 pages
http://dx.doi.org/10.1155/2010/601675
Research Article

Power Coupling Efficiency Enhancement in Multimode Step-Index Fiber Using Refractive and Diffractive Microlenses

1Department of Physics, ACS College of Engineering, Bangalore 560 074, India
2Department of Physics, Periyar University, Salem 636 011, India

Received 9 September 2010; Revised 19 November 2010; Accepted 5 December 2010

Academic Editor: Victor Arrizon

Copyright © 2010 S. Selvanandan and P. M. Anbarasan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel study has been undertaken for the coupling efficiency enhancement on planar (refractive and diffractive) microlenses as coupling elements with various geometrical shapes in fibre optics communication. When the dispersion of the planar diffractive microlens is expressed in terms of an Abbe number, it is easy to solve for the refractive and diffractive power coupling efficiency that result in a single material. Coupling loss is reduced with microlens used as coupler even when increasing wavelength of the Gaussian beam. A slight difference of power coupling efficiency is observed with the different direction of electric polarisation for a Gaussian beam of large spot size at its waist due to coupling property has been discussed and shown to agree well with theoretical model.