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Correction of Misalignment between Laser Diodes and Optical Fibers by an Optical Rod Interposer

IP.com Disclosure Number: IPCOM000108750D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Benedict, M: AUTHOR [+2]

Abstract

The efficiency of coupling light from a laser-diode into optical fibers depends on the alignment tolerance and the distance between the two parts. Manufacturing costs of packaged parts are strongly influenced by the particular alignment scheme applied.

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Correction of Misalignment between Laser Diodes and Optical Fibers by an Optical Rod Interposer

       The efficiency of coupling light from a laser-diode into
optical fibers depends on the alignment tolerance and the distance
between the two parts.  Manufacturing costs of packaged parts are
strongly influenced by the particular alignment scheme applied.

      In this article we describe a method to introduce short
fiber-cores between laser-diodes and fibers to guide the light
between misaligned parts.  This approach relaxes the mechanical
tolerances in mounting the parts if the alignment of the rods on
either side can be done in a simple way. This can be achieved by
introducing guiding structures in the form of concave cones 1.1 and
1.2 in front of a laser-diode 2 and a fiber 3, as shown in the
figure.  The fabrication of such receptacles has been described
elsewhere, but the basic steps are repeated here. First, small
droplets 4.1, 4.2 of a photoresist are applied to the front of the
laser diode 2 and the optical fiber 3.  The laser-diode 2 is then
energized to expose the photoresist 4.2.  Similarly a light beam is
sent through the fiber 3 from the backside to expose the photoresist
4.1 at the front end.  The photoresist has to be sensitive to the
particular wavelength used.  After developing the resist, a structure
with concave oval cones 1.1 and 1.2, self-aligned to the optical path
of each part 2 and 3, results.  It is now possible to install a fiber
...