Abstract

Shuttle pulse measurements performed on a 1280-m long multimode optical fiber were used to determine pulse dispersion along a 6400-m extrapolated length. The fiber's steady-state mode coupling length was determined without breaking the fiber. The impulse responses for one, three, and five trips through the fiber were recorded and Fourier transformed to yield the corresponding baseband frequency responses. It was concluded that the coupling length was approximately 840 m, and that the impulse response became increasingly more symmetrical for fiber lengths beyond this coupling length. This agrees with theory.

© 1975 Optical Society of America

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References

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  1. S. D. Personick, Bell Syst. Tech. J. 50, 843 (1971).
  2. L. G. Cohen, Appl. Opt. 14, 1351 (1975).
    [CrossRef] [PubMed]
  3. D. B. Keck, R. D. Maurer, “Optical Pulse Broadening in Long Fiber Waveguides,” MRI Symposium on Optical and Acoustical Micro-Electronics, New York City16–18 April 1974.
  4. H. M. Presby, BTL; unpublished work.
  5. D. Gloge, W. Mammel, E. A. J. Marcatili, D. Vitello, BTL; unpublished work.
  6. S. D. Personick, Bell Syst. Tech. J. 52, 1175 (1973).

1975 (1)

1973 (1)

S. D. Personick, Bell Syst. Tech. J. 52, 1175 (1973).

1971 (1)

S. D. Personick, Bell Syst. Tech. J. 50, 843 (1971).

Cohen, L. G.

Gloge, D.

D. Gloge, W. Mammel, E. A. J. Marcatili, D. Vitello, BTL; unpublished work.

Keck, D. B.

D. B. Keck, R. D. Maurer, “Optical Pulse Broadening in Long Fiber Waveguides,” MRI Symposium on Optical and Acoustical Micro-Electronics, New York City16–18 April 1974.

Mammel, W.

D. Gloge, W. Mammel, E. A. J. Marcatili, D. Vitello, BTL; unpublished work.

Marcatili, E. A. J.

D. Gloge, W. Mammel, E. A. J. Marcatili, D. Vitello, BTL; unpublished work.

Maurer, R. D.

D. B. Keck, R. D. Maurer, “Optical Pulse Broadening in Long Fiber Waveguides,” MRI Symposium on Optical and Acoustical Micro-Electronics, New York City16–18 April 1974.

Personick, S. D.

S. D. Personick, Bell Syst. Tech. J. 52, 1175 (1973).

S. D. Personick, Bell Syst. Tech. J. 50, 843 (1971).

Presby, H. M.

H. M. Presby, BTL; unpublished work.

Vitello, D.

D. Gloge, W. Mammel, E. A. J. Marcatili, D. Vitello, BTL; unpublished work.

Appl. Opt. (1)

Bell Syst. Tech. J. (2)

S. D. Personick, Bell Syst. Tech. J. 50, 843 (1971).

S. D. Personick, Bell Syst. Tech. J. 52, 1175 (1973).

Other (3)

D. B. Keck, R. D. Maurer, “Optical Pulse Broadening in Long Fiber Waveguides,” MRI Symposium on Optical and Acoustical Micro-Electronics, New York City16–18 April 1974.

H. M. Presby, BTL; unpublished work.

D. Gloge, W. Mammel, E. A. J. Marcatili, D. Vitello, BTL; unpublished work.

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Figures (4)

Fig. 1
Fig. 1

Refractive-index profile across the core of the CGW-Bell-39 fiber. Results were deduced from interference microscopy.

Fig. 2
Fig. 2

Sampling scope displays of the first shuttle pulse received after L = 1280 m, the second pulse after L = 3840 m, and the third pulse after L = 6400 m: (a) the fiber input was coaxially aligned with the injected laser beam; (b) the fiber input end was intentionally tilted (7°) to emphasize the launching of higher order modes.

Fig. 3
Fig. 3

Pulse widths between 10-dB power points are plotted vs CGW-Bell-39 fiber length. Computed 10-dB pulse widths predict 20-nsec/km pulse spreading without mode mixing.

Fig. 4
Fig. 4

(a), (b), (c) Baseband frequency responses (Fourier transforms of impulse responses) for pulses illustrated in Fig. 3 (a). Dotted lines give frequency and phase at the half-amplitude point.

Equations (1)

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| H ( f ) | exp [ ( 2 π f σ ) 2 / 2 ] ,

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