Title :
Three-terminal operation analysis of exciton absorption reflection switches (EARS´s)
Author :
Amano, Chikara ; Matsuo, Shinji ; Nakahara, Tatsushi ; Kurokawa, Takashi
Author_Institution :
NTT Opto-Electron. Labs., Atsugi, Japan
fDate :
2/1/1993 12:00:00 AM
Abstract :
The three-terminal operation of photonic-switching arrays consisting of multiple-quantum-well (MQW) modulators and heterojunction phototransistors (HPTs) connected with distributed Bragg reflectors (DBRs) is analyzed. NOR and OR gate characteristics are achieved by modifying the electrical connection between the MQW modulators and HPTs. A memory function is obtained by controlling DBR transmission. By using an optimum load resistor for the HPTs, switch-on and switch-off times are balanced, and minimum switching energy is obtained. Reduction of residual carrier concentrations in the collector layer of the HPTs and operating voltage of the MQW modulators give a switching energy as low as 1 fJ/μm2
Keywords :
electro-optical devices; excitons; optical logic; optical modulation; optical switches; phototransistors; semiconductor quantum wells; DBR transmission; EARS; MQW modulators; NOR gate characteristics; OR gate characteristics; collector layer; distributed Bragg reflectors; electrical connection; exciton absorption reflection switches; heterojunction phototransistors; memory function; minimum switching energy; operating voltage; optimum load resistor; photonic-switching arrays; residual carrier concentrations; switch on times; switch-off times; three-terminal operation; Absorption; Distributed Bragg reflectors; Excitons; Heterojunctions; Optical modulation; Phototransistors; Quantum well devices; Reflection; Resistors; Voltage;
Journal_Title :
Quantum Electronics, IEEE Journal of
