RADIATION LOSSES IN GLASS OPTICAL WAVEGUIDES

@article{Kapron1970RADIATIONLI,
  title={RADIATION LOSSES IN GLASS OPTICAL WAVEGUIDES},
  author={F. Kapron and D. Keck and R. Maurer},
  journal={Applied Physics Letters},
  year={1970},
  volume={17},
  pages={423-425}
}
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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