Browse Prior Art Database

Thin Film Package for Fiber-optic Transceivers

IP.com Disclosure Number: IPCOM000107658D
Original Publication Date: 1992-Mar-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 64K

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 the replacement of conventional coaxial cables with fiber-optic lines. To do this, digital electronic signals must be converted to pulsed light waves by a transmitter optical subassembly (TOSA) and receiver optical subassembly (ROSA).

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Thin Film Package for Fiber-optic Transceivers

       The need for electronic computers to communicate over
greater distances with faster data rates and wider bandwidths is
resulting in the replacement of conventional coaxial cables with
fiber-optic lines.  To do this, digital electronic signals must be
converted to pulsed light waves by a transmitter optical subassembly
(TOSA) and receiver optical subassembly (ROSA).

      A high-performance, reduced-cost, compact package using
thin-film technology is disclosed to accomplish these objectives.

      As shown in Figs. 1 and 2, serializer and de-serializer chips
are vertically edge mounted to a grounded stiffener and electrically
connected to the fiber-optic transmitter (TOSA) and receiver (ROSA).
The grounded stiffener provides mounting for the thin film as well as
electrical isolation between the TOSA and ROSA circuitry.  The chips
are adhesively attached to the stiffener while the chip's
input/output terminals are soldered (using known C4 technology) to
the thin film, keeping line lengths short and impedances matched.
This complete TOSA and ROSA assembly is mounted on a circuit card
which provides signals to/from the TOSA and ROSA as well as power by
way of the thin film.

      This packaging concept will yield a low-cost, high-performance
electronic communications device.