High-Efficiency Excitation of Nonlinear Guided Waves Using Chirped and Tapered Gratings,
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1992
- Accession Number
- ADP008116
Entities
People
- Guifang Li
Organizations
- University of Wisconsin–Madison