Abstract
We propose a set of guidelines for the practical design of lensed fiber
for the optical coupling of semiconductor lasers in butterfly packages using
laser welding. These guidelines have optimized the tradeoff between coupling
efficiency and alignment tolerance. Moreover, a radius of curvature of 11 $\mu$m is shown to
be optimal for semiconductor lasers whose divergence angles range from 5$^{\circ}$ to 30$^{\circ}$. To experimentally
evaluate the design, lensed fibers were assembled by a Nd:YAG laser welding
technique in conventional butterfly packages and their coupling efficiencies
were 28%–72% without horizontal misalignment compensation.
© 2009 IEEE
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