Inventors:
David A. Ackerman - Hopewell NJ
Paul M. Nitzsche - Plainfield NJ
Paul W. Smith - Reading PA
Assignee:
AT&T Bell Laboratories - Murray Hill NJ
International Classification:
H01S 308
Abstract:
We have discovered that the yield of DFB lasers suitable, e. g. , for use in AM CATV systems can be substantially increased if the lasers have a back facet with a higher reflectivity (>80%, preferably >90%) HR coating thereon than is conventional (e. g. ,. about. 65%). Exemplary currently preferred embodiments of the invention comprise a three-pair stack of. lambda. /4 yttrium-stablized zirconia/Si having about 95% reflectivity.