Browse Prior Art Database

TO CAN DESIGN FOR VCSEL

IP.com Disclosure Number: IPCOM000008579D
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jun-25
Document File: 2 page(s) / 81K

Publishing Venue

Motorola

Related People

Brian Webb: AUTHOR [+2]

Abstract

Laser transmitters are used in a number of applications including cd players, code readers and voice and data transmission over optical fiber. The lasers used in these applications are historically edge emitting lasers housed in a TO-Hermetic metal can for improved reliability and thermal dissipation, In many cases a photo diode is also included in the metal can to provide automatic power control of the laser. Motorola has developed a new laser technology which uses a low cost high performance vertical cavity surface emitting laser [VCSEL] technology. These will also be packaged in TO-56 metal cans for socket compatibility and will provide improved life, lower cost, and superior performance.

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MOTOROLA Technical Developments

TO CAN DESIGN FOR VCSEL

by Brian Webb and Lawrence Boughter

BACKGROUND

  Laser transmitters are used in a number of applications including cd players, code readers and voice and data transmission over optical fiber. The lasers used in these applications are historically edge emitting lasers housed in a TO-Hermetic metal can for improved reliability and thermal dissipation, In many cases a photo diode is also included in the metal can to provide automatic power control of the laser. Motorola has developed a new laser technology which uses a low cost high performance vertical cavity surface emitting laser [VCSEL] technology. These will also be packaged in TO-56 metal cans for socket compatibility and will provide improved life, lower cost, and superior performance.

PROBLEM

  Since a VCSEL will only emit light from the surface of the device it is necessary to direct a portion of the light to the photo diode. This is accomplished in one of 2 ways:

I. By attaching a hologram to the surface of the glass window of the TO-56 metal can which redirects a portion on the light to the adjacent photodiode.

2. By using an angled glass window in the metal can which has a reflective coating on the inside which also redirects a portion of the light onto the adjacent photodiode.

  In order to insure that the redirected light reaches the photodiode not only is the positioning of the vcsel and photodiode critical but the positioning of the cover is also crit...