Browse Prior Art Database

Optical Fiber Link Card Retainer/Holder

IP.com Disclosure Number: IPCOM000101558D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 4 page(s) / 134K

Publishing Venue

IBM

Related People

Barber, JA: AUTHOR [+4]

Abstract

Fiber-Optic technologies are providing performance and packaging solutions for today's computer interconnect applications. High data rate requirements coupled with the flexibility of connectorized optical transmitter/receiver subassemblies and the requirement for customer access to these ports has resulted in the design of small feature cards. The design of these cards has created new challenges in the areas of both the attachment and strain relief of optical subassemblies and feature card attachment to next level assemblies. Disclosed herein are mechanical packaging concepts for such a fiber-optic feature card incorporating the required attributes.

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Optical Fiber Link Card Retainer/Holder

       Fiber-Optic technologies are providing performance and
packaging solutions for today's computer interconnect applications.
High data rate requirements coupled with the flexibility of
connectorized optical transmitter/receiver subassemblies and the
requirement for customer access to these ports has resulted in the
design of small feature cards.  The design of these cards has created
new challenges in the areas of both the attachment and strain relief
of optical subassemblies and feature card attachment to next level
assemblies.  Disclosed herein are mechanical packaging concepts for
such a fiber-optic feature card incorporating the required
attributes.

      In the embodiment illustrated in Fig. 1, four optical
subassemblies (two transmitters 4 and two receivers 5) are shown
being attached to a small printed circuit card 1 by means of a lower
retainer 2 and upper clip 6.  The lower retainer incorporates rails
on each side to guide the circuit card, tabs on the rear to hold the
card in position, and three locating pins which fit into
corresponding holes in the card to lock it in position.  The lower
retainer also incorporates a "cradle" type retention system for the
optical subassemblies.  These cradles have bosses which interlock
with slots on the optical subassemblies and lock them into place,
providing strain relief from both rotational and longitudinal forces.
This insures mechanical integrity of the optical assemblies against
forces exerted on the fiber cables to be attached to the
connectorized assemblies.  A metal shield 3 for protection against
electromagnetic interference (EMI) is attached to the circuit card
and is captivated between the lower retainer and optical
subassemblies.  The lower retainer also incorporates "J" clip
mounting hooks at the rear, which will be described in detail below.
The upper clip attaches by means of integral snaps without any
additional fasteners or adhesives, enhancing manufacturability.

      In the design of a fiber-optic transceiver feature card,
several issues must be addressed.  The optical assemblies are "axial"
leaded devices by design.  T...