Abstract: A method and apparatus aligns device components based on an analysis of an image of features of the components to be aligned. The image is analyzed for deviation in component alignment, and a signal, based on the deviation, is sent to a positioning apparatus to adjust the position of the components relative to each other. The image of the components is advantageously a top view which permits measuring deviations in alignment of features on the top surfaces of components. The components are advantageously bonded together after alignment, and the alignment accuracy of the bonded components is checked.

Abstract: Parameters of a clad optical fiber are measured by irradiating the fiber with a laser beam to generate a scattering pattern. Measurements are made of fringes and modulations in the scattering pattern and these measurements are translated into such parameters as the diameter of the core and cladding thickness as well as the deviation from concentricity of the core of the clad optical fiber.

Abstract: Method and apparatus are disclosed for determining a parameter of a clad optical fiber from the scattering angle at the maximum of a modulation component in a forward far-field scattering pattern produced by directing a monochromatic coherent light beam at the fiber. One such parameter is the ratio between core radius and cladding radius.

Abstract: Parameters of a clad optical fiber are measured by irradiating the fiber with a laser beam to generate a scattering pattern. Measurements are made of fringes and modulations in the scattering pattern and these measurements are translated into such parameters as core and fiber diameter.