Accession Number : ADA299610
Title : Evaluation of Gain Quenching Vertical Cavity Lasers with In-Plane Lasers for Smart Pixel Switching.
Descriptive Note : Final rept. Mar 94-Mar 95,
Corporate Author : CORNELL UNIV ITHACA NY SCHOOL OF ELECTRICAL ENGINEERING
Personal Author(s) : Shire, D. B. ; Tang, C. L.
PDF Url : ADA299610
Report Date : AUG 1995
Pagination or Media Count : 31
Abstract : A detailed study of monolithically integrated, intracavity coupled in plane and vertical cavity surface emitting lasers (VCSELs) for smart pixel switching is performed. It is shown that the extent to which the VCSEL section output is quenched depends on the overlap of the two lasers' gain regions, and on the in plane laser bias current. Complete quenching of the VCSEL output to a small spontaneous emission level is demonstrated under proper operating conditions, as indicated by an upward shift in VCSEL lasing threshold current and by truncation of short pulses. The VCSEL output is an amplified and inverted version of the input signal to the in plane laser section. The combined device is also shown to be bistable, and an all optical two input NOR gate is demonstrated to show the flexibility of this new switching technology. Two in plane lasers are intracavity coupled to a common VCSEL section, which serves as the output device. A contrast ratio of at least 5:1 is measured between the logic 0 and logic 1 states. Potential applications of the in plane VCSEL smart pixel include free space interconnects, other all optical logic gates, and optical memory devices which would be utilized, for example, in an all optical time slot interchange switch or a dense wavelength division multiplexing (WDM) system.
Descriptors : *LASER CAVITIES, *ELECTRONIC SWITCHING, OUTPUT, THRESHOLD EFFECTS, QUENCHING, MEMORY DEVICES, SIGNALS, GAIN, LOGIC CIRCUITS, OVERLAP, MONOLITHIC STRUCTURES(ELECTRONICS), FREQUENCY DIVISION MULTIPLEXING, PIXELS, OPTICAL STORAGE, BIAS, SHORT PULSES, NOR GATES.
Subject Categories : Lasers and Masers
Distribution Statement : APPROVED FOR PUBLIC RELEASE