Browse Prior Art Database

Controlled-Impedance Fiber Optic Receiver Module

IP.com Disclosure Number: IPCOM000112086D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Hogan, WK: AUTHOR [+3]

Abstract

A controlled impedance fiber optic receiver module is disclosed. This receiver module uses an epoxy of known dielectric constant to create a transmission line environment for the leads of the receiver module from the card attach to entry into the TO can.

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This is the abbreviated version, containing approximately 100% of the total text.

Controlled-Impedance Fiber Optic Receiver Module

      A controlled impedance fiber optic receiver module is
disclosed.  This receiver module uses an epoxy of known dielectric
constant to create a transmission line environment for the leads of
the receiver module from the card attach to entry into the TO can.

      This invention creates a pseudo coaxial transmission line
formed by the leads of the TO can that houses the actual receive
device and the outside Receiver Optical Sub Assembly (ROSA) module as
shown in the Figure.

      An insulating epoxy with a known and desired value of
dielectric constant fills the ROSA, which then gives the designed
line impedance value.  To make the full transmission line return
currents, a conductive epoxy connects the grounded TO can housing to
the ROSA and then a low inductance ground strap connects the ROSA to
the printed circuit card.