Highly efficient optical coupling of laser diode array to single-mode fiber array with heat-treated hemispherical microlens

Low-loss coupling has been achieved between a laser diode array and a single-mode fiber array. The single-mode fiber array is tipped with a newly developed heat-treated hemispherical microlens. Average array coupling loss was as low as 3.9/spl plusmn/0.4 dB.<
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