Abstract

A near-field index-profile measurement technique is applied to check the presence of leaky tunneling rays in multimode nearly elliptical fibers. If the fiber is uniformly illuminated, the profiles turn out to be quite flat because the contribution to the near field of the leaky tunneling modes is practically negligible after a short fiber length owing to the tunneling–radiating effect that both whispering and bouncing modes undergo.

© 1981 Optical Society of America

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References

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  1. F. M. E. Sladen, D. N. Payne, M. J. Adams, “Determination of optical fiber refractive index profiles by a near field scanning technique,” Appl. Phys. Lett. 28, 255 (1976).
    [CrossRef]
  2. M. J. Adams, D. N. Payne, F. M. E. Sladen, “Leaky rays on optical fibres of arbitrary (circularly symmetric) index profiles,” Electron. Lett. 11, 238 (1975).
    [CrossRef]
  3. M. J. Adams, D. N. Payne, F. M. E. Sladen, “Mode transit time in near parabolic index optical fibers,” Electron. Lett. 11, 389 (1975).
    [CrossRef]
  4. M. J. Adams, D. N. Payne, F. M. E. Sladen, “Length-dependent effects due to leaky modes on multimode graded index optical fibres,” Opt. Commun. 17, 204 (1976).
    [CrossRef]
  5. K. Petermann, “Uncertainties of leaky mode correction for near square law optical fibres,” Electron. Lett. 13, 513 (1977).
    [CrossRef]
  6. J. J. Ramskov Hansen, G. Jacobsen, B. Hallbery, “Leaky modes in non circular graded index optical fibers,” Opt. Commun. 26, 331 (1978).
    [CrossRef]
  7. P. F. Checcacci, R. Falciai, A. M. Scheggi, “Tunneling–radiating effect in elliptical step index fibers,” Opt. Lett. 5, 145 (1980).
    [CrossRef] [PubMed]
  8. P. F. Checcacci, R. Falciai, A. M. Scheggi, “Applicability of an asymptotic numerical method to the determination of whispering and bouncing modes in elliptical fibers,” J.Opt.Soc.Am. 70, 1551 (1980).
    [CrossRef]

1980 (2)

P. F. Checcacci, R. Falciai, A. M. Scheggi, “Applicability of an asymptotic numerical method to the determination of whispering and bouncing modes in elliptical fibers,” J.Opt.Soc.Am. 70, 1551 (1980).
[CrossRef]

P. F. Checcacci, R. Falciai, A. M. Scheggi, “Tunneling–radiating effect in elliptical step index fibers,” Opt. Lett. 5, 145 (1980).
[CrossRef] [PubMed]

1978 (1)

J. J. Ramskov Hansen, G. Jacobsen, B. Hallbery, “Leaky modes in non circular graded index optical fibers,” Opt. Commun. 26, 331 (1978).
[CrossRef]

1977 (1)

K. Petermann, “Uncertainties of leaky mode correction for near square law optical fibres,” Electron. Lett. 13, 513 (1977).
[CrossRef]

1976 (2)

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Length-dependent effects due to leaky modes on multimode graded index optical fibres,” Opt. Commun. 17, 204 (1976).
[CrossRef]

F. M. E. Sladen, D. N. Payne, M. J. Adams, “Determination of optical fiber refractive index profiles by a near field scanning technique,” Appl. Phys. Lett. 28, 255 (1976).
[CrossRef]

1975 (2)

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Leaky rays on optical fibres of arbitrary (circularly symmetric) index profiles,” Electron. Lett. 11, 238 (1975).
[CrossRef]

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Mode transit time in near parabolic index optical fibers,” Electron. Lett. 11, 389 (1975).
[CrossRef]

Adams, M. J.

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Length-dependent effects due to leaky modes on multimode graded index optical fibres,” Opt. Commun. 17, 204 (1976).
[CrossRef]

F. M. E. Sladen, D. N. Payne, M. J. Adams, “Determination of optical fiber refractive index profiles by a near field scanning technique,” Appl. Phys. Lett. 28, 255 (1976).
[CrossRef]

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Mode transit time in near parabolic index optical fibers,” Electron. Lett. 11, 389 (1975).
[CrossRef]

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Leaky rays on optical fibres of arbitrary (circularly symmetric) index profiles,” Electron. Lett. 11, 238 (1975).
[CrossRef]

Checcacci, P. F.

P. F. Checcacci, R. Falciai, A. M. Scheggi, “Applicability of an asymptotic numerical method to the determination of whispering and bouncing modes in elliptical fibers,” J.Opt.Soc.Am. 70, 1551 (1980).
[CrossRef]

P. F. Checcacci, R. Falciai, A. M. Scheggi, “Tunneling–radiating effect in elliptical step index fibers,” Opt. Lett. 5, 145 (1980).
[CrossRef] [PubMed]

Falciai, R.

P. F. Checcacci, R. Falciai, A. M. Scheggi, “Tunneling–radiating effect in elliptical step index fibers,” Opt. Lett. 5, 145 (1980).
[CrossRef] [PubMed]

P. F. Checcacci, R. Falciai, A. M. Scheggi, “Applicability of an asymptotic numerical method to the determination of whispering and bouncing modes in elliptical fibers,” J.Opt.Soc.Am. 70, 1551 (1980).
[CrossRef]

Hallbery, B.

J. J. Ramskov Hansen, G. Jacobsen, B. Hallbery, “Leaky modes in non circular graded index optical fibers,” Opt. Commun. 26, 331 (1978).
[CrossRef]

Jacobsen, G.

J. J. Ramskov Hansen, G. Jacobsen, B. Hallbery, “Leaky modes in non circular graded index optical fibers,” Opt. Commun. 26, 331 (1978).
[CrossRef]

Payne, D. N.

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Length-dependent effects due to leaky modes on multimode graded index optical fibres,” Opt. Commun. 17, 204 (1976).
[CrossRef]

F. M. E. Sladen, D. N. Payne, M. J. Adams, “Determination of optical fiber refractive index profiles by a near field scanning technique,” Appl. Phys. Lett. 28, 255 (1976).
[CrossRef]

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Mode transit time in near parabolic index optical fibers,” Electron. Lett. 11, 389 (1975).
[CrossRef]

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Leaky rays on optical fibres of arbitrary (circularly symmetric) index profiles,” Electron. Lett. 11, 238 (1975).
[CrossRef]

Petermann, K.

K. Petermann, “Uncertainties of leaky mode correction for near square law optical fibres,” Electron. Lett. 13, 513 (1977).
[CrossRef]

Ramskov Hansen, J. J.

J. J. Ramskov Hansen, G. Jacobsen, B. Hallbery, “Leaky modes in non circular graded index optical fibers,” Opt. Commun. 26, 331 (1978).
[CrossRef]

Scheggi, A. M.

P. F. Checcacci, R. Falciai, A. M. Scheggi, “Applicability of an asymptotic numerical method to the determination of whispering and bouncing modes in elliptical fibers,” J.Opt.Soc.Am. 70, 1551 (1980).
[CrossRef]

P. F. Checcacci, R. Falciai, A. M. Scheggi, “Tunneling–radiating effect in elliptical step index fibers,” Opt. Lett. 5, 145 (1980).
[CrossRef] [PubMed]

Sladen, F. M. E.

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Length-dependent effects due to leaky modes on multimode graded index optical fibres,” Opt. Commun. 17, 204 (1976).
[CrossRef]

F. M. E. Sladen, D. N. Payne, M. J. Adams, “Determination of optical fiber refractive index profiles by a near field scanning technique,” Appl. Phys. Lett. 28, 255 (1976).
[CrossRef]

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Mode transit time in near parabolic index optical fibers,” Electron. Lett. 11, 389 (1975).
[CrossRef]

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Leaky rays on optical fibres of arbitrary (circularly symmetric) index profiles,” Electron. Lett. 11, 238 (1975).
[CrossRef]

Appl. Phys. Lett. (1)

F. M. E. Sladen, D. N. Payne, M. J. Adams, “Determination of optical fiber refractive index profiles by a near field scanning technique,” Appl. Phys. Lett. 28, 255 (1976).
[CrossRef]

Electron. Lett. (3)

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Leaky rays on optical fibres of arbitrary (circularly symmetric) index profiles,” Electron. Lett. 11, 238 (1975).
[CrossRef]

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Mode transit time in near parabolic index optical fibers,” Electron. Lett. 11, 389 (1975).
[CrossRef]

K. Petermann, “Uncertainties of leaky mode correction for near square law optical fibres,” Electron. Lett. 13, 513 (1977).
[CrossRef]

J.Opt.Soc.Am. (1)

P. F. Checcacci, R. Falciai, A. M. Scheggi, “Applicability of an asymptotic numerical method to the determination of whispering and bouncing modes in elliptical fibers,” J.Opt.Soc.Am. 70, 1551 (1980).
[CrossRef]

Opt. Commun. (2)

J. J. Ramskov Hansen, G. Jacobsen, B. Hallbery, “Leaky modes in non circular graded index optical fibers,” Opt. Commun. 26, 331 (1978).
[CrossRef]

M. J. Adams, D. N. Payne, F. M. E. Sladen, “Length-dependent effects due to leaky modes on multimode graded index optical fibres,” Opt. Commun. 17, 204 (1976).
[CrossRef]

Opt. Lett. (1)

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Figures (3)

Fig. 1
Fig. 1

Experimental setup for the near-field measurement.

Fig. 2
Fig. 2

Near-field intensity profiles measured on three step-index circular fibers with three different diameters.

Fig. 3
Fig. 3

(a) Dashed lines: near-field intensity profiles measured across the two principal diameters of a nearly elliptical fiber with Δa/a =0.09. Solid line: the same profile measurement performed illuminating, preferentially, the whispering modes. (b) The same as (a) for a fiber with Δa/a =0.02.

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