Asymmetric Coupled Quantum Wells for High Speed Optical Modulators at Communication Wavelengths
Final rept. Jan 1993-Jan 1994
ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
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A novel design for electro-optic modulators operating at wavelengths compatible with fiber-based optical interconnects and networks is presented. This design uses InGaAsInAlAs 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 InGaAsInAlAs 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, InGaAsInAlAs Asymmetric Coupled Quantum WellsACQWs.
- Electrooptical and Optoelectronic Devices
- Fiber Optics and Integrated Optics