Asymmetric Coupled Quantum Wells for High Speed Optical Modulators at Communication Wavelengths

Download or read book Asymmetric Coupled Quantum Wells for High Speed Optical Modulators at Communication Wavelengths written by and published by . This book was released on 1994 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel design for electro-optic modulators operating at wavelengths compatible with fiber-based optical interconnects and networks is presented. This design uses InGaAs/InAlAs asymmetric coupled quantum wells (ACQWS) to enhance the electro-optic effect within the material and results in a low power modulator capable of high-speed operation. A device was fabricated which shows real charge transfer between the ACQWs. This device shows that without modulation doping and real charge transfer the quantum confined stark effect in InGaAs/InAlAs is insufficient to provide strong modulation at low drive voltages. Standard pump-probe techniques were also used to study the dynamics Of charge transfer between the wells. Picosecond recovery times were exhibited by these devices and were found to be independent of the barrier width. Electro- optic modulators, InGaAs/InAlAs Asymmetric Coupled Quantum Wells(ACQWs).