Browse Prior Art Database

Ridge Waveguide Ridge Mirror Laser Diode

IP.com Disclosure Number: IPCOM000111540D
Original Publication Date: 1994-Mar-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Harder, CH: AUTHOR [+3]

Abstract

Conventional ridge waveguide laser diodes 1 have a ridge 2 up to the mirror facet 3, as illustrated in Fig. 1. This is a problem for the following two reasons: First, a considerable yield detractor in fabricating ridge waveguide laser diodes is caused by bad cleaves (to form the mirror 3) due to the ridge topography and second, we observe in failure analysis that in some cases the laser fails at the mirror 3, predominantly at the corners 4 of the ridge 2.

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Ridge Waveguide Ridge Mirror Laser Diode

      Conventional ridge waveguide laser diodes 1 have a ridge 2 up
to the mirror facet 3, as illustrated in Fig. 1.  This is a problem
for the following two reasons: First, a considerable yield detractor
in fabricating ridge waveguide laser diodes is caused by bad cleaves
(to form the mirror 3) due to the ridge topography and second, we
observe in failure analysis that in some cases the laser fails at the
mirror 3, predominantly at the corners 4 of the ridge 2.

      We propose a new ridge waveguide laser diode 5 with a corner
free mirror region 6.  This new topology is shown in Fig. 2.  For
obvious reasons, this structure is called Ridge Waveguide Ridge
Mirror (RWRM) laser diode.  The new laser 5 operates well as long as
the ridge mirror 6 is not too wide.  Our present technology enables
us to place a cleave within a few microns on the center of the mirror
ridge 7.  The mirror ridge  7 can therefore be made very narrow.
Such a narrow mirror ridge 7 has no detrimental effect on the laser
performance.