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Optical Engineering

Truncated Gaussian beams through microlenses based on a graded-index section
Author(s): Monique Thual; Damien Malarde; B. Abherve-Guegen; P. Rochard; Philippe Chanclou
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Paper Abstract

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 90 μm) and working distances (up to 2000 μm) 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.

Paper Details

Date Published: 1 January 2007
PDF: 12 pages
Opt. Eng. 46(1) 015402 doi: 10.1117/1.2431798
Published in: Optical Engineering Volume 46, Issue 1
Show Author Affiliations
Monique Thual, École Nationale Supérieure des Sciences Appliquées et de Technologie (France)
Damien Malarde, École Nationale Supérieure des Sciences Appliquées et de Technologie (France)
B. Abherve-Guegen, École Nationale Supérieure des Sciences Appliquées et de Technologie (France)
P. Rochard, École Nationale Supérieure des Sciences Appliquées et de Technologie (France)
Philippe Chanclou, France Télécom R&D (France)


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