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Accession Number:
AD0489390
Title:
SOLID STATE TECHNIQUES FOR MODULATION AND DEMODULATION OF OPTICAL WAVES.
Corporate Author:
TEXAS INSTRUMENTS INC DALLAS
Report Date:
1966-08-01
Abstract:
Techniques for developing wideband optical modulators of KDP potassium dihydrogen phosphate were studied theoretically and experimentally. Forty-five degree, z-cut KDP modulators were built that required as little as 200 volts to achieve 100 percent optical modulation. Traveling-wave KDP and ADP ammonium dihydrogen phosphate modulators were tested up to 2 and 3 GHz. Crystalline quartz exhibited several properties valuable for achieving extremely wideband modulation. Homogeneous and inhomogeneous strains in cubic materials e.g., HMTA and CuCl hexamethylene-tetramine and copper chloride seriously degrade their performance as electro-optic modulators. In certain Perovskites, effects of such strains are only second-order near the ferroelectric transition temperature and under large bias fields. Ultrasonic time-variable phase diffraction gratings were produced in crystalline quartz. Techniques for fabricating fast semiconductor germanium and silicon diodes were developed. Silicon p-i-n diodes were studied. Explicit expressions for device efficiency, signal-to-noise ratio, and noise equivalent power NEP were derived as functions of bandwidth, load impedance, and other parameters. Low-noise, high-gain transistor amplifiers were designed to extract the optimum signal from the diodes. The avalanche mechanism was isolated and developed.
Descriptive Note:
Rept. no. 8 (Final) 1 May 62-31 Aug 65,
Pages:
0283
Contract Number:
DA-36-039-AMC-03250(E)
File Size:
0.00MB
