Browse Prior Art Database

Nested Dual Cam Optical Transmitter

IP.com Disclosure Number: IPCOM000111216D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Carden, G: AUTHOR [+3]

Abstract

Disclosed is a technique for manufacturing a low cost Transmitting Optical Sub-Assembly (TOSA). Due to the high placement precision required for maintaining good optical performance, expensive tools and techniques are frequently used in manufacturing TOSAs. Through the use of off axis rotating cams, light coupling from a laser diode can be maximized into an optical fiber. One popular approach in present TOSA manufacturing processes involves aligning a laser diode device to an optical fiber through the use of high precision stages and then bonding the device into place. This can be accomplished through several methods such as soldering, epoxy or welding.

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Nested Dual Cam Optical Transmitter

      Disclosed is a technique for manufacturing a low cost
Transmitting Optical Sub-Assembly (TOSA).  Due to the high placement
precision required for maintaining good optical performance,
expensive tools and techniques are frequently used in manufacturing
TOSAs.  Through the use of off axis rotating cams, light coupling
from a laser diode can be maximized into an optical fiber.  One
popular approach in present TOSA manufacturing processes involves
aligning a laser diode device to an optical fiber through the use of
high precision stages and then bonding the device into place.  This
can be accomplished through several methods such as soldering, epoxy
or welding.

      Fig. 1 shows the cross sectioned layout of a proposed concept.
It incorporates two non-concentric cam like rings, offset in
orthogonal directions with appropriate dimensions.  One immediate
feature with this design is that it eliminates expensive gripping
tools because the rings are snapped into one another and the TOSA
body.  Thus, all of the TOSA components can be pre-assembled
off-line, with no regard to placement accuracy.  Another advantage is
that we no longer need to have a strong, low Thermo Coefficient of
Expansion (TCE) bonding mechanism to hold the parts together to
achieve alignment.  It only requires a bonding technique that will
prevent the parts from further rotation once they are aligned.  An
enhancement to the locking/aligning technique would be to use
external gear teeth on the cams for automated ro...