Abstract

Transmission loss in plastic optical fibers was investigated for axial, small numerical aperture input. The loss coefficient α was determined as a function of wavelength λ by varying sample length and using filters. More extensive information on α(λ) was obtained by use of a monochromator with transmission at a particular λ standardized by independent measurement. Measurement in white light of scattered intensity as a function of position along a fiber yielded α and an estimate of scattering power. Analyses of the scattering data and the variation of α with λ suggest that scattering is the principal loss mechanism.

© 1968 Optical Society of America

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References

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  1. M. Born, E. Wolf, Principles of Optics (The Macmillan Company, New York, 1964), 2nd ed.
  2. R. G. Brown, B. N. Derick, submitted to Appl. Opt.
  3. R. J. Porter, J. Opt. Soc. Amer. 51, 1079 (1961).
    [CrossRef]
  4. R. G. Brown, Appl. Optics 6, 1269 (1967).
    [CrossRef]
  5. N. S. Kapany, Fiber Optics (Academic Press Inc., New York, 1967).
  6. RCA Electron Tube Handbook (Radio Corporation of America, Harrison, New Jersey).

1967 (1)

R. G. Brown, Appl. Optics 6, 1269 (1967).
[CrossRef]

1961 (1)

R. J. Porter, J. Opt. Soc. Amer. 51, 1079 (1961).
[CrossRef]

Born, M.

M. Born, E. Wolf, Principles of Optics (The Macmillan Company, New York, 1964), 2nd ed.

Brown, R. G.

R. G. Brown, Appl. Optics 6, 1269 (1967).
[CrossRef]

R. G. Brown, B. N. Derick, submitted to Appl. Opt.

Derick, B. N.

R. G. Brown, B. N. Derick, submitted to Appl. Opt.

Kapany, N. S.

N. S. Kapany, Fiber Optics (Academic Press Inc., New York, 1967).

Porter, R. J.

R. J. Porter, J. Opt. Soc. Amer. 51, 1079 (1961).
[CrossRef]

Wolf, E.

M. Born, E. Wolf, Principles of Optics (The Macmillan Company, New York, 1964), 2nd ed.

Appl. Optics (1)

R. G. Brown, Appl. Optics 6, 1269 (1967).
[CrossRef]

J. Opt. Soc. Amer. (1)

R. J. Porter, J. Opt. Soc. Amer. 51, 1079 (1961).
[CrossRef]

Other (4)

N. S. Kapany, Fiber Optics (Academic Press Inc., New York, 1967).

RCA Electron Tube Handbook (Radio Corporation of America, Harrison, New Jersey).

M. Born, E. Wolf, Principles of Optics (The Macmillan Company, New York, 1964), 2nd ed.

R. G. Brown, B. N. Derick, submitted to Appl. Opt.

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Figures (7)

Fig. 1
Fig. 1

Phototube response to transmitted flux vs bundle length for (a) a progressively shortened 48-fiber bundle, α = 0.0050 cm−1, and (b) a series of 16-fiber bundles prepared to different lengths, α = 0.0043 cm−1. A Wratten #74 filter with peak transmission near 5350 Å was used in both cases.

Fig. 2
Fig. 2

Phototube response to scattered white light flux vs position along sample for (a) a 16-fiber bundle, α = 0.0058 cm−1, and (b) a single fiber, α = 0.036 cm−1.

Fig. 3
Fig. 3

Transmission spectra for fiber optics bundles 30 cm, 60 cm, 120 cm, and 240 cm long, with end losses set equal to Fresnel loss for perfect surfaces.

Fig. 4
Fig. 4

Loss coefficient α vs λ−4. Regions labelled I, II, and III represent different possible contributions to α.

Fig. 5
Fig. 5

Loss coefficient α vs scattering power expressed in terms of phototube response extrapolated to fiber input end.

Fig. 6
Fig. 6

Synthesized phototube response distribution to light from incandescent source transmitted through fibers 30–210 cm long. Marks near peaks of curves designate wavelength centers of gravity, including tails of response curves not shown.

Fig. 7
Fig. 7

Synthesized phototube output vs fiber length.

Tables (1)

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Table I Values of Loss Coefficient at Selected Wavelengths From Transmission Spectra of a Series of Different Length Bundles

Equations (2)

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Φ = Φ 0 E 2 e - α x ,
i exp ( - α i x ) exp ( - α k x ) ,

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