A Calorimetric Technique for the Measurement of Low Optical Absorption Losses in Bulk Glass and Optical Communication Fibres

  • K I White
  • J E Midwinter
Part of the Optical Physics and Engineering book series (OPEG)


In the bulk glass measurement, a pair of thin rod samples are rigidly mounted in a massive brass enclosure. As the rod ends are immersed in index matching liquid, no optical polishing is necessary. One sample is illuminated by a laser beam and the temperature rise due to the absorbed energy is measured by a thermocouple. For the fibre measurement, the solid rod is replaced by a fibre led through a silica tube filled with a low index liquid. A laser power of 100mW gives a sensitivity of 1dB/Km limited by thermocouple Johnson noise. Replacing the fibre by a fine resistance wire conducting a known current provides a calibration of the apparatus.


Silica Tube Bulk Glass Fibre Absorption Direct Illumination Thermocouple Wire 
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Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • K I White
    • 1
  • J E Midwinter
    • 1
  1. 1.Post Office Research CentreMartlesham HeathIpswich, SuffolkUK

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