Francis A. Jenkins, Harvey E. White's Fundamentals of Optics, Fourth Edition PDF

By Francis A. Jenkins, Harvey E. White

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Losses in optical fibers can occur when there is separation between the fiber end surfaces or axial or angular misalignment. Reflection and scattering from imperfections in the optical fiber end surfaces can also create losses. Optical fiber connectors are used when fiber segments will need to be connected and disconnected repeatedly. There are a large number of different connector types on the market. A conceptual sketch of a basic fiber optic connector is shown below. precision alignment sleeve optical fiber restraining bolt metal/fiber mating piece Optical fiber splices are connections that are considered to be effectively permanent.

Distant return source fiber fiber reflective diaphragm cranial pressure PC lumen pressure P close return fiber In this sensor, a thin flexible catheter has a reflective moveable diaphragm at its distal point. The catheter has a lumen that can be pressurized and that contains three optical fibers whose polished ends are in close proximity to the reflective diaphragm: one closer to the diaphragm than the other two that are located at the same distance. One side of the diaphragm sees the intracranial pressure Pc, whereas the other sees the adjustable pressure in the lumen.

For thin magnetic films, the situation is quite different. Geometrical and energy constraints produce adjacent domains in which the magnetic moments are either up or down normal to the film plane. An applied magnetic field can modify the relative domain sizes or orientation of the moments within a domain but not their magnitude. , bismuth-substituted iron garnet, forms a polarization-independent optical phase grating whose properties can be modulated by appropriate applied magnetic fields. Monochromatic light incident upon such a grating will be diffracted along conical surfaces, and if the film has the proper thickness, then no light will be transmitted in the zeroth diffraction order for zero applied field.

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