Abstract

The four complex, almost degenerate, second-order eigenmodes of a two-mode fiber having a circular core are reduced to two nondegenerate, linearly polarized second-order eigenmodes with stable-intensity lobe positions in a highly elliptical core fiber. Existing two-mode-fiber devices can be improved by this stabilization of the second-order modes. Practical sensors employing the two spatial modes as the two arms of an interferometer are described. The two arms of an interferometer of this type can have the same group delays, while the difference in phase delays is large.

© 1987 Optical Society of America

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References

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  1. J. N. Blake, B. Y. Kim, H. J. Shaw, Opt. Lett. 11, 177 (1986).
    [Crossref] [PubMed]
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    [Crossref] [PubMed]
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    [Crossref]
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    [Crossref] [PubMed]
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    [Crossref] [PubMed]
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1986 (6)

1984 (1)

1979 (1)

1975 (1)

Blake, J. N.

Brooks, J. L.

Bucaro, J. A.

Engan, H. E.

J. N. Blake, B. Y. Kim, H. E. Engan, H. J. Shaw, Proc. Soc. Photo-Opt. Instrum. Eng. 719, 92 (1986).

B. Y. Kim, J. N. Blake, H. E. Engan, H. J. Shaw, Opt. Lett. 11, 389, (1986).
[Crossref] [PubMed]

Hara, E. H.

Imai, M.

Kim, B. Y.

Layton, M. R.

Shaw, H. J.

Snyder, A. W.

Sorin, W. V.

Youngquist, R. C.

Zheng, X.-H.

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Figures (4)

Fig. 1
Fig. 1

Guided modes in circular core optical fibers with one of the two orthogonal polarizations. (a) LP01 mode, (b) LP11 mode.

Fig. 2
Fig. 2

(a) Dimensions of the elliptical core fiber. Far-field radiation patterns from the elliptical core fiber for (b) the LP01 mode (at λ = 600 nm), (c) the LP 11 even mode (at λ = 488 nm), (d) the LP 11 odd mode (at λ = 457 nm).

Fig. 3
Fig. 3

(a) Superposition of the LP01 and LP 11 even modes with a phase difference ϕ. (b) Far-field radiation patterns from highly elliptical core fiber with approximately equal intensities of LP01 and LP 11 even modes.

Fig. 4
Fig. 4

Examples of highly elliptical core two-mode fiber interferometers. S, source; D, detector, LP11MS, LP11 mode stripper; SMF, single-mode fiber; TMF, two-mode fiber.

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