Accession Number : ADP008116

Title :   High-Efficiency Excitation of Nonlinear Guided Waves Using Chirped and Tapered Gratings,

Corporate Author : WISCONSIN UNIV-MADISON DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Personal Author(s) : Li, Guifang

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : All-optical computing and signal processing using nonlinear guided-wave devices potentially offer high speed and low energy consumption. Efficient control of light by light requires that the product of the nonlinear coefficient (of the waveguide) and the guided-wave intensity be significant. The wavenumber of a nonlinear guided wave, however, is a function of its intensity. The distributive excitation of nonlinear guided waves using a grating is a coherent process. Since the guided-wave amplitude builds up from zero, the local wavenumber of the nonlinear guided wave varies within the extent of the grating. The phase-matching condition for the coherent excitation process can only be satisfied at one location. Theoretical and experimental investigations of the excitation of nonlinear guided waves demonstrate that the excitation efficiency decreases as the incident intensity increases for a fixed nonlinear coefficient. Therefore, even if very highly nonlinear optical materials are available, the above-mentioned product is still limited by the excitation process.

Descriptors :   *EXCITATION, *NONLINEAR SYSTEMS, *WAVES, *GRATINGS(SPECTRA), AMPLITUDE, COEFFICIENTS, CONSUMPTION, CONTROL, EFFICIENCY, ENERGY, ENERGY CONSUMPTION, FUNCTIONS, INTENSITY, LIGHT, LOW ENERGY, MATCHING, MATERIALS, OPTICAL MATERIALS, PHASE, PROCESSING, SIGNAL PROCESSING, SIGNALS, VELOCITY, WAVEGUIDES, COHERENCE, ANGLE OF INCIDENCE, COMPUTERS.

Subject Categories : Fluid Mechanics
      Atomic and Molecular Physics and Spectroscopy
      Optics
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE