Abstract
In this paper, we demonstrated the use of a photodiode (PD) packaging
technique that employs a catadioptric system. This optical system consisted
of two components: a BK7 ball lens with a diameter of 1.5 mm that was soldered
with glass on a hermetic cap and a plastic-molded offset parabolic mirror
with a radius of 550 $\mu$m and an offset of 550 $\mu$m. The offset parabolic mirror was mounted above a surface-illuminated
InGaAs pin PD with a detective area of diameter 20 $\mu$m. When an incident pencil of rays
were passed through the ball lens and then perpendicularly reflected by the
mirror and impinged upon the PD, compact planar assembling became possible
for numerous electrical parts on a can-type header for minimizing parasitic
impedance due to wire bonds. The optical system provided a high coupling efficiency
of 98% between a single-mode fiber and the PD.
© 2009 IEEE
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