Efficient Optical Logic, Interconnections and Processing Using Quantum Confined Structures
Annual rept. 30 Sep 89-31 Mar 91,
CALIFORNIA UNIV SANTA BARBARA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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The work has been strongly focused on the development of high- efficiency surface-normal Fabry-Perot cavity modulators in particular the asymmetric Fabry-Perot modulator AFPM. In contrast to the high-finesse, refractive index-tuned, symmetric cavity type of modulator SFPM, on which we first reported under contract 85-0323, the AFPM utilizes the electroabsorptive properties of the intra-cavity medium- normally a GaAs-AlGaA multiple quantum well structure-to balance the initially unbalanced asymmetric mirrors of a low-finessee cavity, thus making it possible to achieve high contrast ratio, very efficient transfer function with low operating voltage, low insertion loss and, importantly, significantly wider optical bandwidth for the SFPM. During this period we made one of the initial demonstrations of the AFPM, where we achieved a contrast ratio of 221 in reflection, at a d.c. operating voltage of IIV, and with only 3.7dB insertion loss.
- Quantum Theory and Relativity