Abstract
We propose a self-alignment process of an optical device with an optical
multimode fiber (MMF) and a novel optical subassembly using a pre-self-aligned
device. In order to form the pre-self-aligned device, the optical device such
as a vertical-cavity surface-emitting laser (VCSEL) is aligned with the MMF
using the surface tension of a transparent liquid adhesive. The optical subassembly
we have developed is provided with a simple structure consisting of the pre-self-aligned
VCSEL and an interposer board to be mounted on a printed circuit board (PCB).
Details of the low-cost self-alignment technology and the optical subassembly
are reported. Alignment accuracy of average 13 $\mu{\hbox {m}}$ is achieved and coupling
efficiency of the self-aligned VCSEL to the MMF is determined to be maximum
35%. 1-Gb/s optical signal transmission using the optical subassembly is also
demonstrated. This self-alignment technology and the fabricated optical subassembly
are effective in achieving low-cost optical modules for optical interconnect
systems from commodities to high-end applications.
© 2009 IEEE
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