Abstract

A nondestructive refractive-index profile measurement of optical-fiber preform rods by means of a transverse-differential-interference method is given. The error resulting from the data reading of a fringe center is investigated by computer simulation and is confirmed to be less than about 1% of the index difference between the core and the cladding. The refractive-index profile of a preform rod was measured, and it almost coincided with that of the fiber drawn from the rod. The elliptic deformation of the core and its variation along the longitudinal axis were measured.

© 1980 Optical Society of America

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References

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  1. Y. Kokubun, K. Iga, Paper of TGOQE, Institute of Electronics and Communication Engineers Japan, No. OQE78-99 (1978).
  2. K. Hotate, T. Okoshi, Trans. Inst. Electron. Commun. Eng. Jpn. E62, No. 1, 1 (1979).
  3. T. Tanaka, Y. Suematsu, Trans. Inst. Electron. Commun. Eng. Jpn. E59, No. 11, 1 (1976).
  4. W. E. Martin, Appl. Opt. 13, 2112 (1974).
    [CrossRef] [PubMed]
  5. T. Miya, M. Horiguchi, K. Senda, T. Edahiro, National Convention Records of Institute of Electronics and Communications Engineers Japan, No. 818 (1978).
  6. M. Ikeda, M. Tateda, H. Yoshikiyo, Appl. Opt. 14, 814 (1975).
    [CrossRef] [PubMed]
  7. Y. Kokubun, K. Iga, Trans. Inst. Electron. Commun. Eng. Jpn. E60, No. 12, 702 (1977).
  8. Y. Kokubun, K. Iga, Trans. Inst. Electron Commun. Eng. Jpn. E61, No. 3, 184 (1978).
  9. T. Okoshi, N. Takada, Paper of TGOQE, Institute of Electronics and Communication Engineers Japan, No. OQE78-62 (1978).
  10. K. Iga, N. Yamamoto, Appl. Opt. 16, 1305 (1977).
    [CrossRef] [PubMed]

1979

K. Hotate, T. Okoshi, Trans. Inst. Electron. Commun. Eng. Jpn. E62, No. 1, 1 (1979).

1978

T. Miya, M. Horiguchi, K. Senda, T. Edahiro, National Convention Records of Institute of Electronics and Communications Engineers Japan, No. 818 (1978).

Y. Kokubun, K. Iga, Trans. Inst. Electron Commun. Eng. Jpn. E61, No. 3, 184 (1978).

1977

K. Iga, N. Yamamoto, Appl. Opt. 16, 1305 (1977).
[CrossRef] [PubMed]

Y. Kokubun, K. Iga, Trans. Inst. Electron. Commun. Eng. Jpn. E60, No. 12, 702 (1977).

1976

T. Tanaka, Y. Suematsu, Trans. Inst. Electron. Commun. Eng. Jpn. E59, No. 11, 1 (1976).

1975

1974

Edahiro, T.

T. Miya, M. Horiguchi, K. Senda, T. Edahiro, National Convention Records of Institute of Electronics and Communications Engineers Japan, No. 818 (1978).

Horiguchi, M.

T. Miya, M. Horiguchi, K. Senda, T. Edahiro, National Convention Records of Institute of Electronics and Communications Engineers Japan, No. 818 (1978).

Hotate, K.

K. Hotate, T. Okoshi, Trans. Inst. Electron. Commun. Eng. Jpn. E62, No. 1, 1 (1979).

Iga, K.

Y. Kokubun, K. Iga, Trans. Inst. Electron Commun. Eng. Jpn. E61, No. 3, 184 (1978).

K. Iga, N. Yamamoto, Appl. Opt. 16, 1305 (1977).
[CrossRef] [PubMed]

Y. Kokubun, K. Iga, Trans. Inst. Electron. Commun. Eng. Jpn. E60, No. 12, 702 (1977).

Y. Kokubun, K. Iga, Paper of TGOQE, Institute of Electronics and Communication Engineers Japan, No. OQE78-99 (1978).

Ikeda, M.

Kokubun, Y.

Y. Kokubun, K. Iga, Trans. Inst. Electron Commun. Eng. Jpn. E61, No. 3, 184 (1978).

Y. Kokubun, K. Iga, Trans. Inst. Electron. Commun. Eng. Jpn. E60, No. 12, 702 (1977).

Y. Kokubun, K. Iga, Paper of TGOQE, Institute of Electronics and Communication Engineers Japan, No. OQE78-99 (1978).

Martin, W. E.

Miya, T.

T. Miya, M. Horiguchi, K. Senda, T. Edahiro, National Convention Records of Institute of Electronics and Communications Engineers Japan, No. 818 (1978).

Okoshi, T.

K. Hotate, T. Okoshi, Trans. Inst. Electron. Commun. Eng. Jpn. E62, No. 1, 1 (1979).

T. Okoshi, N. Takada, Paper of TGOQE, Institute of Electronics and Communication Engineers Japan, No. OQE78-62 (1978).

Senda, K.

T. Miya, M. Horiguchi, K. Senda, T. Edahiro, National Convention Records of Institute of Electronics and Communications Engineers Japan, No. 818 (1978).

Suematsu, Y.

T. Tanaka, Y. Suematsu, Trans. Inst. Electron. Commun. Eng. Jpn. E59, No. 11, 1 (1976).

Takada, N.

T. Okoshi, N. Takada, Paper of TGOQE, Institute of Electronics and Communication Engineers Japan, No. OQE78-62 (1978).

Tanaka, T.

T. Tanaka, Y. Suematsu, Trans. Inst. Electron. Commun. Eng. Jpn. E59, No. 11, 1 (1976).

Tateda, M.

Yamamoto, N.

Yoshikiyo, H.

Appl. Opt.

National Convention Records of Institute of Electronics and Communications Engineers Japan

T. Miya, M. Horiguchi, K. Senda, T. Edahiro, National Convention Records of Institute of Electronics and Communications Engineers Japan, No. 818 (1978).

Trans. Inst. Electron Commun. Eng. Jpn.

Y. Kokubun, K. Iga, Trans. Inst. Electron Commun. Eng. Jpn. E61, No. 3, 184 (1978).

Trans. Inst. Electron. Commun. Eng. Jpn.

Y. Kokubun, K. Iga, Trans. Inst. Electron. Commun. Eng. Jpn. E60, No. 12, 702 (1977).

K. Hotate, T. Okoshi, Trans. Inst. Electron. Commun. Eng. Jpn. E62, No. 1, 1 (1979).

T. Tanaka, Y. Suematsu, Trans. Inst. Electron. Commun. Eng. Jpn. E59, No. 11, 1 (1976).

Other

T. Okoshi, N. Takada, Paper of TGOQE, Institute of Electronics and Communication Engineers Japan, No. OQE78-62 (1978).

Y. Kokubun, K. Iga, Paper of TGOQE, Institute of Electronics and Communication Engineers Japan, No. OQE78-99 (1978).

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Figures (12)

Fig. 1
Fig. 1

Measuring system of transverse differential interferometry.

Fig. 2
Fig. 2

Core-radius dependence of the error resulting from the data reading.

Fig. 3
Fig. 3

TV monitor indicating brightness distribution. (The sample of this figure is a graded-index multimode fiber.)

Fig. 4
Fig. 4

Transverse-differential-interference pattern of a preform rod with GeO2-doped core fabricated by the CVD method.

Fig. 5
Fig. 5

Smoothing of ripples in the differential interference fringe.

Fig. 6
Fig. 6

Refractive-index profile of a preform rod for a graded-index multimode fiber.

Fig. 7
Fig. 7

Refractive-index profile of a fiber drawn from the preform rod of Fig. 6.

Fig. 8
Fig. 8

Comparison of index profiles of the preform rod (solid curve) and of the fiber drawn for the rod (dashed curve).

Fig. 9
Fig. 9

Refractive-index profile of a fiber drawn from the same preform rod, measured by the NFP method.

Fig. 10
Fig. 10

Core-diameter and radius variation vs rotation angle.

Fig. 11
Fig. 11

Longitudinal variations of the core diameters of the major and the minor axes.

Fig. 12
Fig. 12

Longitudinal variations of directions of the major and the minor axes.

Equations (7)

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n ( u ) = n 2 × exp ( - 1 π 0 π / 2 λ D s R d ( y ) [ a 2 - ( u n 2 ) 2 ] 1 / 2 cos θ n 2 { ( u n 2 ) 2 + [ a 2 - ( u n 2 ) 2 ] sin 2 θ } 1 / 2 d θ ) ,
y = { ( u n 2 ) 2 + [ a 2 - ( u n 2 ) 2 ] sin 2 θ } 1 / 2 ,
r = u / [ n ( u ) ] ,
= ( δ n 2 - δ n 2 ) 1 / 2 .
Δ n = K d λ 2 s Δ n δ R D ,
Δ n = K t λ 2 a Δ n δ R D ,
K t = 0.15 ( N - 1 ) .

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