High Speed Signal Extraction Using Electro-Optic Techniques
Final technical rept. Jan 1986-Sep 1987
ROCHESTER UNIV NY
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The University of Rochester has done preliminary experiments on several test methods to determine which one could best provide a low loading test environment. The range of techniques considered for signal extraction included direct and external modulation of semiconductor laser light. For the laser based modulation both gain and loss control were considered. Under gain controlled laser modulation using available semiconductor lasers, the max. efficiency of the laser would cause unwanted current loading of the device under test DUT. Using loss modulation in laser diodes, efficient modulation can be obtained with only small loading effects however, these diodes are very temperature sensitive and will not give the necessary performance under a variety of temperature. External modulation by electroabsorption was also inadequate due to temperature sensitivity. There are polymers which exhibit electro-optic co-efficients orders of magnitude greater than conventional crystals, but for some reason these effects fade with time. Finally, U of R considered confined wave modulators. The integrated Mach-Zender modulation can be directly connected to optical fibers without polarizers. This technique was the one determined to be the most viable in producing a low loading signal extraction method.
- Electrooptical and Optoelectronic Devices