Browse Prior Art Database

Low Inductance Ground Strap

IP.com Disclosure Number: IPCOM000112188D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Gaio, DP: AUTHOR [+4]

Abstract

A low inductance grounding mechanism for use with fiber optic transmitter/receivers assemblies is disclosed. This technique can prevent unwanted oscillations of the receiver and also provides shielding against external interference.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 95% of the total text.

Low Inductance Ground Strap

      A low inductance grounding mechanism for use with fiber optic
transmitter/receivers assemblies is disclosed.  This technique can
prevent unwanted oscillations of the receiver and also provides
shielding against external interference.

      The sources and receivers used in fiber optic links are by
design sensitive to low-level signals and therefore are prone to
oscillation and interference from external sources.  The solution
illustrated in the figure below consists of a circular ground strap,
where multiple leads from the strap would be connected into the
ground plane of the riser card.  These leads would be connected to a
metal band.  The band would have hertz stress dimples which would
create a defined contact area between the band and the conductive
body of the ROSA (Receiver Optical SubAssembly).  A conductive bond
such as soldering, welding or epoxy would provide connection between
the ROSA body and receiver device package inside.

      This ground strap will reduce oscillations by providing a low
inductance ground path for the receiver, and in addition acts to
shield the signal lines from externally generated noise.

      The ground strap could also be used to provide a low inductance
ground or shield to the laser device housed inside the Transmitter
Optical Sub Assembly (TOSA).  In this case, a ground must be provided
to the body of the TOSA to provide both an RF ground path for image
return currents and ref...