Optical Interconnects

Truncated Gaussian beams through microlenses based on a graded-index section

[+] Author Affiliations
Monique Thual, Damien Malarde, Benoit Abhervé-Guégen, Philippe Rochard

Université de Rennes I, Ecole Nationale Supérieure de Sciences Appliquées et de Technologie, Centre Commun Lannionnais d’Optique, Laboratoire d’Optronique CNRS-UMR 6082, BP80518, 22305 Lannion, France

Philippe Chanclou

France Télécom Division R&D, 2 avenue Pierre Marzin, 223007 Lannion, France

Opt. Eng. 46(1), 015402 (January 25, 2007). doi:10.1117/1.2431798
History: Received November 03, 2005; Revised May 17, 2006; Accepted June 28, 2006; Published January 25, 2007
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We have developed a simple and low-cost microlens for optical communication systems involving the coupling of laser diodes or integrated waveguides to single-mode fibers (SMFs), and fiber-to-fiber interconnection. More generally, the applications concern coupling active or passive components to SMFs. The novelty consists in using a graded-index section of 125-μm core diameter without cladding and taking into account the diffraction effects. This new microlens offers a wider range of mode field diameters (from around 5 to 90μm) and working distances (up to 2000μm) than previously demonstrated. This paper investigates the influence of the Fresnel diffraction of a Gaussian beam, during its propagation through the microlens, on the mode field intensity profile, the working distance, and the coupling efficiency of this kind of microlens in front of a SMF. It shows that while truncation causes multiple maxima of the coupling efficiency as a function of z displacement, it does not decrease the maximum coupling efficiency.

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© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Monique Thual ; Damien Malarde ; Benoit Abhervé-Guégen ; Philippe Rochard and Philippe Chanclou
"Truncated Gaussian beams through microlenses based on a graded-index section", Opt. Eng. 46(1), 015402 (January 25, 2007). ; http://dx.doi.org/10.1117/1.2431798


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