Title :
Propagation characteristics of optical fiber structures with arbitrary shape and index variation
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
Abstract :
The application of the scalar wave-fast Fourier transform (SW-FFT) technique to the computation of the propagation characteristics of some complex optical fiber structures is presented. The SW-FFT technique is based on the numerical solution of the scalar wave equation by a forward-marching fast Fourier transform method. This solution yields the spatial configuration of the fields as well as its modal characteristics in and around the guiding structure. The following are treated by the SW-FFT method: analysis of coupled optical fibers and computation of their odd and even modes and coupling length; the solution of tapered optical waveguides (transitions) and the study of the effect of the slope of the taper on mode conversion; and the analysis of branching optical fibers and demonstration of their mode-filtering and/or power-dividing properties.<>
Keywords :
fast Fourier transforms; optical fibres; branching optical fibers; coupled optical fibers; coupling length; even modes; forward-marching fast Fourier transform; index variation; mode-filtering; numerical solution; odd modes; optical fiber structures; power-dividing; propagation characteristics; scalar wave equation; scalar wave-fast Fourier transform; spatial configuration; tapered optical waveguides; transitions; Coupled mode analysis; Fast Fourier transforms; Fourier transforms; Optical computing; Optical coupling; Optical fibers; Optical propagation; Optical waveguides; Partial differential equations; Waveguide transitions;
Conference_Titel :
Aerospace Applications Conference, 1990. Digest., 1990 IEEE
Conference_Location :
Vail, CO, USA
DOI :
10.1109/AERO.1990.109078
