Title :
Carrier collection efficiency effects and improvements of electroabsorption devices with different barrier structures
Author :
Morgan, Robert A. ; Chirovsky, Leo M F ; Leibenguth, Ronald E.
Author_Institution :
AT&T Bell Lab., Breinigsville, PA, USA
fDate :
3/1/1992 12:00:00 AM
Abstract :
Self-electrooptic effect devices (SEEDs) with both thick (60 Å) and thin (35 Å) quantum-well barriers were studied experimentally. Relevant device properties including responsivity, carrier collection efficiency, switching, and optical bistability behavior are compared. SEED modulator photocurrent and reflectivity data are analyzed and shown to predict S-SEED behavior. A simple yet powerful optical technique for measuring the light utilization efficiency and the carrier collection efficiency η is described and used to compare different device mesa sizes and barrier structures. The effects of η on device performance are expounded. For thin-barrier SEEDs, η is substantially improved, approaching 100%, even at bias voltages approaching zero and for small device structures
Keywords :
electro-optical devices; electroabsorption; optical bistability; optical switches; reflectivity; SEED modulator photocurrent; barrier structures; bias voltages; carrier collection efficiency; device mesa sizes; device properties; electroabsorption devices; light utilization efficiency; optical bistability behavior; reflectivity data; responsivity; self-electrooptic effect devices; switching; thin quantum well barriers; Data analysis; Optical bistability; Optical devices; Optical modulation; Photoconductivity; Quantum well devices; Reflectivity; Size measurement; Time of arrival estimation; Voltage;
Journal_Title :
Quantum Electronics, IEEE Journal of
