Accession Number:

AD0489390

Title:

SOLID STATE TECHNIQUES FOR MODULATION AND DEMODULATION OF OPTICAL WAVES.

Descriptive Note:

Rept. no. 8 (Final) 1 May 62-31 Aug 65,

Corporate Author:

TEXAS INSTRUMENTS INC DALLAS

Personal Author(s):

Report Date:

1966-08-01

Pagination or Media Count:

283.0

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.

Subject Categories:

  • Optics
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE