Abstract
In this paper, we present a technique for producing fibers optics micro-collimators composed of polydimethylsiloxane PDMS microlenses of different radii of curvature. The waist and working distance values obtained enable the optimization of optical coupling between optical fibers, fibers and optical sources, and fibers and detectors. The principal is based on the injection of polydimethylsiloxane (PDMS) into a conical micro-cavity chemically etched at the end of optical fibers. A spherical microlens is then formed that is self-centered with respect to the axis of the fiber. Typically, an optimal radius of curvature of 10.08μm is obtained. This optimized micro-collimator is characterized by a working distance of 19.27μm and a waist equal to 2.28μm for an SMF 9/125μm fiber. The simulation and experimental results reveal an optical coupling efficiency that can reach a value of 99.75%.
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