Browse Prior Art Database

Direct Chip Attach Thin Film Package for Fiber Optic Tranceivers System

IP.com Disclosure Number: IPCOM000120690D
Original Publication Date: 1991-May-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 47K

Publishing Venue

IBM

Related People

Murphy, RG: AUTHOR [+2]

Abstract

The need for electronic computers to communicate over greater distances with faster data rates and wider bandwidths is resulting in replacement of conventional coaxial cables with fiber optic lines. To do this, digital electronic signals must be converted to pulsed light waves (using a transmitting optical subassembly, or TOSA), received at a termination point and re-digitized (using a receiving optical sub-assembly, or ROSA).

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Direct Chip Attach Thin Film Package for Fiber Optic Tranceivers
System

      The need for electronic computers to communicate over greater
distances with faster data rates and wider bandwidths is resulting in
replacement of conventional coaxial cables with fiber optic lines.
To do this, digital electronic signals must be converted to pulsed
light waves (using a transmitting optical subassembly, or TOSA),
received at a termination point and re-digitized (using a receiving
optical sub-assembly, or ROSA).

      A high performance, reduced cost, compact package using thin
film technology has been disclosed to accomplish this.

      Serializer and de-serializer chips are direct chip attached
(DCA) to a pulsed light receiver and transmitter. The flexible thin
film cable bends and connects each chip to its respective transmitter
and receiver unit pins.  Chips can be mounted underneath or on the
top of the flex.  The flex then attaches to card pads.  The card acts
as a media between transmitter and receiver.

      The transmitter/receiver circuits are electrically isolated by
a vertical mount grounded metal shield for noise reduction (see
Figure 1).

      This package will yield high frequency performance using thin
film technology and DCA to reduce cost and package size.

      Disclosed anonymously.