Abstract
This paper represents a development of a new advanced technology to fabricate and characterize micro-collimators with hemi-ellipsoidal microlenses at single-mode fibers outputs. The proposed method utilizes the controlled mechanical micromachining technique based on the variation of the speed of the fiber around its axis in both X and Y directions followed by the injection of a quantity of polydimethylsiloxane (PDMS) to form the hemi-ellipsoidal microlenses. The experimental results show that this technique allows to obtain a wide variety of ellipticity diameters ratios from 0.68 to 0.84. An elliptical ratio of radii of curvature Ry/Rx in a range of 0.51 at 0.86 is also obtained. In this investigation a mode field diameters MFD in an interval between 3.26 μm and 9.93 μm have been realized. The measurement results demonstrate that the proposed technology allows to fabricate hemi-ellipsoidal microlenses having an MFD ellipticity ratios of about 0.60 to 0.97 in near field promising for micro-collimator suitable to match an elliptical laser beam to the circular one of a fiber.
Highlights
Evolution and development in the field of fiber optic connectivity, in particular optical coupling end elements, is an essential requirement for improving power coupling efficiency between optoelectronic devices, especially laser diodes and optical fibers
Before to conclude the asymmetric profiles results are discussed and the mode field diameter (MFD) characterization in near field is compared to calculations
The manufacturing technique consists in two main steps: first polishing the fiber output in an elliptical transverse section and second depositing polymer to form the hemi-ellipsoidal microlens at the fiber output
Summary
Evolution and development in the field of fiber optic connectivity, in particular optical coupling end elements, is an essential requirement for improving power coupling efficiency between optoelectronic devices, especially laser diodes and optical fibers. The same polishing time gives the same speeds Vx, Vy which will subsequently give us the same ellipticity ratio This novel method allows forming microlenses with different targeted radii of curvatures at a SMF fiber output to fit the ellipticity shape of the laser beam modes to be coupled to the SMF. The advantage of this manufacturing technique is the possibility of controlling the elliptical ratio of the microlenses to adapt the mode of the laser to that of fiber. Before to conclude the asymmetric profiles results are discussed and the mode field diameter (MFD) characterization in near field is compared to calculations
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