Browse Prior Art Database

Combined Laser Alignment and Hermetic Sealing Technique

IP.com Disclosure Number: IPCOM000037985D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Carden, GR: AUTHOR [+4]

Abstract

Disclosed is a process that both optically aligns and hermetically seals opto-electronic assemblies such as fiber-optic transmitters and receivers.

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Combined Laser Alignment and Hermetic Sealing Technique

Disclosed is a process that both optically aligns and hermetically seals opto- electronic assemblies such as fiber-optic transmitters and receivers.

Prior assembly methods involve two steps. Typically the optical elements are assembled and hermetically sealed in one package. Then this sealed assembly is then optically aligned in another assembly so that the output light is delivered where desired.

This invention provides both a unique package (seen in Fig. 1) and a special adaptation to the hermetic sealing process. The package is composed of a more-or-less conventional base portion to which the optically active elements are attached and electrically connected. A novel combined lid and optical assembly is provided that has the necessary optical elements to collect and direct the light as required by the application. In Fig. 1 these elements are shown as a graded index lens and optical fiber, but there are several other useful embodiments.

These two elements are placed in a projection welding machine that had been modified with the added capability to accurately align the optical lid with respect to the optical device on the base. When the correct alignment is achieved the lid is hermetically welded using a modified sealing technique. The new technique takes advantage of multiple height projections that allow limited vertical alignment adjustment depending upon the weld energy and pressure used.

Disclosed ano...