Massively Parallel Optical-to-Electronic Data Transfer
Final rept. 1 Oct 1988-31 Mar 1992,
GEORGIA INST OF TECH ATLANTA SCHOOL OF ELECTRICAL ENGINEERING
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The design and experimental verification of a system composed of a page-oriented holographic binary memory and a compatible CMOS chip for receiving the stored data are presented. The optical retrieval system is novel in that the Bragg cell for selecting positions in the memory plane is coupled to the angle-selecting Bragg cell by an optical fiber array. This relieves several optical constraints and allows compact packaging of the system. The design, analysis, and fabrication of the electronic RAM array was performed using the 2-micron CMOS process available through MOSIS. A high-speed integrated CMOS process was chosen for its logic-integration capabilities. Adding the photodetector and associated circuitry to the normal design procedures provides for direct optical-to-electronic interfacing. Based on the measured efficiency of the optical system and the measured sensitivity of the CMOS detectors, it is 5 predicted that a memory with a page size of 128 x 128 bits and a read rate of 5 x 105 pages per second could be constructed. A variety of applications beyond ROM-to-RAM data transfer are discussed.
- Electrical and Electronic Equipment
- Electrooptical and Optoelectronic Devices