Abstract

The transmission spectrum of a short multimode fiber can vary periodically with the reciprocal of wavelength. This adversely affects a standard EIA and CCITT measurement method for cutoff wavelength of single-mode fiber. The measurement problem may be solved by underfilling the multimode reference fiber. The periodic spectral characteristics resemble interference phenomena.

© 1987 Optical Society of America

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References

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  1. Electronic Industries Association (USA) fiber-optic test procedures FOTP-80 and FOTP-170, currently in draft form.
  2. International Telegraph and Telephone Consultative Committee recommendation G.652, Geneva (1985).
  3. M. Singh, GTE Laboratories, Waltham, Mass. (personal communication).
  4. FOTP-50, in Electronic Industries Association (USA) standard RS-455-46 (1983).
  5. EIA FOTP-80, Ref. 1.
  6. T. Okoshi, Optical Fibers (Academic, New York, 1982).

Okoshi, T.

T. Okoshi, Optical Fibers (Academic, New York, 1982).

Singh, M.

M. Singh, GTE Laboratories, Waltham, Mass. (personal communication).

Other (6)

Electronic Industries Association (USA) fiber-optic test procedures FOTP-80 and FOTP-170, currently in draft form.

International Telegraph and Telephone Consultative Committee recommendation G.652, Geneva (1985).

M. Singh, GTE Laboratories, Waltham, Mass. (personal communication).

FOTP-50, in Electronic Industries Association (USA) standard RS-455-46 (1983).

EIA FOTP-80, Ref. 1.

T. Okoshi, Optical Fibers (Academic, New York, 1982).

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Figures (3)

Fig. 1
Fig. 1

Transmission of 2 m of single-mode fiber, referenced to an overfilled 2-m multimode fiber. Cutoff wavelength is defined as the point where the curve is 0.1 dB above a straight line fitted to the right end of the graph. Ripple due to the multimode fiber affects the result.

Fig. 2
Fig. 2

The same curve as Fig. 1 but with restricted optics exciting only 70% of the multimode fiber’s core diameter and N.A. This condition ensures that only guided modes are excited.

Fig. 3
Fig. 3

Transmission of high-order and leaky modes, relative to transmission of guided modes, for a 2-m fiber with 50-μm core and 0.2 N.A. Restriction to guided modes is achieved with a centered 35-μm, 0.14-N.A. spot illuminating the fiber. Preferential excitation of high-order and leaky modes is achieved by moving the spot 30 μm off center. The raw spectrum for off-center excitation shows the periodic features, while the raw guided-mode spectrum does not.

Equations (1)

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1 λ i = i + a n D

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