Abstract
A new scheme of a double-variable-curvature microlens (DVCM) employing
a single-step grinding technique with fully automated fabrication for efficient
coupling between high-power 980-nm laser diodes and single-mode fibers is
proposed and demonstrated. The grinded fiber endface exhibited a double-variable
curvature in the major axis, and was clearly observed for both major and minor
axes after slight fusion polish. The perfect aspherical shape of the DVCM
results in less grinding offset of 0.2 $\mu$m and better curvature radii control that
leads to high average coupling efficiency of 83%. This clearly indicates that
the performance of the DVCM can achieve high average coupling efficiency better
than any other grinding techniques to form asymmetric microlenses. The versatility
in double-variable-curvature design, fully automated fabrication, and the
excellent performance of aspherical microlens makes the proposed DVCM extremely
attractive for use in many lightwave interconnection applications.
© 2010 IEEE
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