Coated DFB semiconductor laser for use in analog optical fiber communication system

摘要

We have discovered that the yield of DFB lasers (10) suitable, e.g., for use in AM CATV systems (30) can be substantially increased if the lasers have a back facet (16) with a higher reflectivity (80%, preferably 90%) HR coating (18) thereon than is conventional (e.g., SIMILAR 65%). Exemplary currently preferred embodiments of the invention comprise a three-pair stack of lambda /4 yttrium-stablized zirconia/Si having about 95% reflectivity. IMAGE