Abstract

This paper describes two approaches to measuring transmission losses in optical fibers by the thermal-rise technique. Rapid and convenient loss determinations can be made on short (~10-cm) lengths of fibers. Values of loss as low as ~10−7 cm−1 (0.043 dB/km) can be measured with transmitted light power of ~100 mW.

© 1974 Optical Society of America

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References

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  1. R. L. Cohen, Appl. Opt. 13, 2518 (1974).
    [CrossRef] [PubMed]
  2. It is possible to measure either total loss (absorption plus scattering) or absorption alone by using either opaque or transparent lacquer in the cell construction.
  3. A doped silica fiber, with 84-μm core and ΔN = 0.008.
  4. D. A. Pinnow, T. C. Rich, Appl. Opt. 13, 1376 (1974).
    [CrossRef] [PubMed]

1974

Appl. Opt.

Other

It is possible to measure either total loss (absorption plus scattering) or absorption alone by using either opaque or transparent lacquer in the cell construction.

A doped silica fiber, with 84-μm core and ΔN = 0.008.

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Figures (3)

Fig. 1
Fig. 1

Sketch of parallel wire loss-measuring cell made by attaching a single very fine wire to the fiber under test using a thin lacquer as cement. The cell is about 17 cm long. The thermal time constant is about 4 sec for a 110-μm fiber.

Fig. 2
Fig. 2

Sketch of tubular loss measuring cell made with two identical tubular elements, one of which is used as the measuring arm and the other as a reference arm to compensate for thermal drifts. The quartz tubes are ~15 cm long and 0.4 mm in diameter. The thermal time constant is about 20 sec for the arrangement shown.

Fig. 3
Fig. 3

Optical connections and ac Wheatstone bridge arrangement for making measurements of fiber transmission loss using the cells shown in Figs. 1 & 2.

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