Active solid-state devices (e.g. – transistors – solid-state diode – Responsive to non-electrical signal – Electromagnetic or particle radiation
Reexamination Certificate
2005-08-23
2005-08-23
Tran, Minhloan (Department: 2826)
Active solid-state devices (e.g., transistors, solid-state diode
Responsive to non-electrical signal
Electromagnetic or particle radiation
C257S014000, C257S021000, C385S002000, C385S003000
Reexamination Certificate
active
06933583
ABSTRACT:
A coupled quantum well Mach-Zehnder modulator that employs a push-pull structure to reduce the modulation voltage. The Mach-Zehnder modulator includes a first arm having a first PIN semiconductor device and a second arm having a second PIN semiconductor device. The intrinsic layers of the PIN devices include a coupled quantum well structure to provide an opposite index of refraction change for different DC bias voltages. An RF signal used to modulate the light beam is applied to the two arms in phase and causes the index of refraction in the intrinsic layers of the two PIN devices to change in opposite directions so that a push-pull type drive is achieved without requiring 180° out-of-phase RF drive signal.
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Forbes David V.
Kunkee Elizabeth T.
Scott David C.
Vang Timothy A.
Wang Wenshen
Dickey Thomas L.
Miller John A.
Northrop Grumman Corporation
Tran Minhloan
Warn, Hoffmann, Miller & LaLone, P.C.
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