In-phase drive of Mach-Zehnder modulator push-pull electrodes
摘要
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 DEG out-of-phase RF drive signal. <IMAGE>
申请公布号
EP1467241(A1)
申请公布日期
2004.10.13
申请号
EP20030026664
申请日期
2003.11.19
申请人
NORTHROP GRUMMAN CORPORATION
发明人
KUNKEE, ELIZABETH T.;FORBES, DAVID V.;SCOTT, DAVID C.;VANG, TIMOTHY A.;WANG, WENSHEN