title: Transient fields in the input coupling region of optical single-mode waveguides.
abstract: We investigate numerically the optical field in the region immediately behind the input facets of dielectric step-index single-mode slab and fiber waveguides. Visualization of the intensity distributions gives insight into the formation of the fundamental mode and of radiation modes. For a more quantitative characterization we determine the amount of optical power and mode purity of the field in core vicinity as a function of propagation distance. The investigation assists in designing and optimizing waveguides being employed as modal filters, e.g. for astronomical interferometers.
authors: Werner
authors: W
authors: Klaus
authors: Walter R
authors: WR
authors: Leeb