High temperature operation of InGaAsP/InP heterostructure lasers and integrated back facet monitors fabricated by chemically assisted ion beam etching

Abstract
Chemically assisted ion beam etching (CAIBE) has been used to etch InGaAsP/InP ridge laser facets. Smooth, vertical facets 4 μm deep have been etched using Ar/Cl2 CAIBE with a beam voltage of 440 V and a beam current density of 0.08 mA/cm2. Room temperature and high temperature (85 °C) LI characteristics and device performance have been evaluated, as well as the performance of integrated back facet monitors. Output powers of 9.5 mW from the laser and a monitor current of 3.75 mA have been obtained.