This inventor holds 9 USPTO granted patents. Top assignees: Trw Limited, Northrop Grumman Systems Corporation, Other. Active years: 2000-2005.
Company Filing History:
4 out of 3,081 
1 out of 3,447 
4 out of 834,350 Years Active: 2000-2005
Title: Innovations of Timothy A Vang
Introduction
Timothy A Vang is a notable inventor based in San Dimas, CA (US). He has made significant contributions to the field of optical devices, holding a total of 9 patents. His work primarily focuses on advanced modulation techniques and phototransistor designs.
Latest Patents
One of his latest patents is titled "In-phase RF drive of Mach-Zehnder modulator push-pull electrodes by using coupled quantum well optical active region." This invention features a coupled quantum well Mach-Zehnder modulator that employs a push-pull structure to reduce the modulation voltage. The modulator consists of two arms, each containing a PIN semiconductor device. The intrinsic layers of these devices include a coupled quantum well structure, which provides an opposite index of refraction change for different DC bias voltages. An RF signal modulates the light beam in phase, causing the index of refraction in the intrinsic layers to change in opposite directions, achieving a push-pull type drive without requiring a 180° out-of-phase RF drive signal.
Another significant patent is the "Three terminal edge illuminated epilayer waveguide phototransistor." This device includes a subcollector layer made of a quaternary semiconductor material, such as heavily doped InGaAsP. The collector region is formed from undoped InGaAs, while the base region consists of a heavily doped InGaAs base layer and a very thin undoped InGaAs spacer layer. The emitter region is composed of a doped InGaAsP layer, a doped InP layer, and a heavily doped InGaAs emitter contact layer. These layers are designed to define an edge-illuminated facet for receiving incident light.
Career Highlights
Throughout his career, Timothy has worked with various companies, including TRW Limited. His innovative designs and patents have contributed to advancements in optical technology and semiconductor devices.
Collaborations
Timothy has collaborated with notable professionals in his field, including David C Scott and Srinath Kalluri. Their combined expertise has likely enhanced the quality and impact of their work.
Conclusion
Timothy A Vang is a distinguished inventor whose contributions to optical devices and semiconductor technology have been recognized through his numerous patents. His innovative approaches continue to influence the field and inspire future advancements.