Title :
A modified model of the light amplifying optical switch (LAOS)
Author :
Zebda, Yousef ; Qasaimeh, Omar
Author_Institution :
Dept. of Electr. Eng., Jordan Univ. of Sci. & Technol., Irbid, Jordan
fDate :
7/1/1995 12:00:00 AM
Abstract :
A new analytical circuit model of the light amplifying optical switch (LAOS) is proposed. The static I-V curve, the switching voltage, and the input-output characteristics can be calculated from this model. The model is based on deriving an expression for the nonlinear current gain of the heterojunction phototransistor (HPT). The switching mechanism and the I-V characteristics of the LAGS is studied in the context of optical and/or electrical feedback. The nonlinear current gain of the HPT, and the Early effect are the main factors which are responsible for the thyristor-like characteristics of the LAOS. An external feedback resistor is also added to achieve the appropriate switching condition and build up the feedback mechanism. A bistable system using a LAGS is also studied as well as the device hysteresis width
Keywords :
circuit feedback; network analysis; optical bistability; optical feedback; optical switches; photothyristors; phototransistors; semiconductor device models; Early effect; I-V characteristics; analytical circuit model; bistable system; device hysteresis width; electrical feedback; external feedback resistor; heterojunction phototransistor; input-output characteristics; light amplifying optical switch model; nonlinear current gain; optical feedback; static I-V curve; switching condition; switching mechanism; switching voltage; thyristor-like characteristics; Analytical models; Circuit analysis; Heterojunctions; Nonlinear optics; Optical bistability; Optical feedback; Optical switches; Phototransistors; Resistors; Voltage;
Journal_Title :
Quantum Electronics, IEEE Journal of
