Calculation of the efficiency of coupling light from a stripe-geometry GaAs laser into optical fiber with two-layer spherical end

The coupling efficiency of light from a GaAs laser into an optical fiber with two-layer spherical end. In this paper, the formulas of calculating the half-acceptance angle of the fiber with two-layer spherical end is derived first. The relationship between the angle (theta) and the refractive angle (gamma) ((theta) ) is derived by ray-tracing techniques. A more complete analysis is done for the restriction by which a ray may not be accepted into the fiber core, namely, waveguide, grazing incidence, and core-aperture restriction. We also calculate the maximum acceptance angle of our fibers and the efficiency of coupling a semiconductor laser beam into an optical fiber with two-layer spherical lens on fiber end. The highly coupling efficiency of up to 80% is arrived.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.