Measurements show that single‐mode waveguides can be constructed which have radiation losses of about 7 dB/km—very close to the intrinsic material scattering loss. These waveguides, with total losses between 60 and 70 dB/km, have permitted the measurement of bending losses which become dominant at radii of curvature of a few centimeters. An approximate theory based on bending a rectangular guide appears to represent the circular waveguide results very well.
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Research Article| October 21 2003
RADIATION LOSSES IN GLASS OPTICAL WAVEGUIDES
F. P. Kapron;
D. B. Keck;
F. P. Kapron, D. B. Keck, R. D. Maurer; RADIATION LOSSES IN GLASS OPTICAL WAVEGUIDES. Appl. Phys. Lett. 15 November 1970; 17 (10): 423–425. https://doi.org/10.1063/1.1653255
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