Abstract
A new scheme of hyperboloid microlens (HM) employing automatic grinding and
precise fusing techniques to achieve high-average and high-yield coupling efficiency
from high-power 980-nm lasers into single mode fibers is proposed and demonstrated. The
fiber endface of the HM exhibited a double-variable curvature in the major and minor
axes that was characterized as a hyperboloid. By selecting half transverse length of the
hyperbola and using fusing process to precise and quantitative controlling the required
minor radius of curvature within 2.4–2.8 µm and offset within 0.8 µm, the HMs
exhibited a high-average coupling efficiency of 83%. For fabricated high-coupling HMs,
the result was also found that the tolerance of minor radius of curvature decreased as
the offset increased. This study demonstrates that the proposed HMs through both
automatic grinding and precise fusing techniques can achieve high-average and high-yield
coupling efficiency better than any other grinding techniques to form asymmetric
microlenses for utilizing in many low-cost lightwave interconnection
applications.
© 2013 IEEE
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