Abstract

The transmission of light as a function of wavelength through biconical tapers formed in sections of monomode and low-mode number optical fibers is considered. It is found that in the monomode propagation regime the transmission varies sinusoidally with wavelength with a 50% peak loss and a 50-nm period, for tapers typical of those used in the manufacture of fused-biconical directional couplers. The observed dependence of transmission on wavelength can be understood using a coupled-mode formalism and leads to new insights into the operation of monomode fused-biconical directional couplers.

© 1985 Optical Society of America

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Corrections

Daniel T. Cassidy, Derwyn C. Johnson, and Kenneth O. Hill, "Wavelength-dependent transmission of monomode optical fiber tapers: errata," Appl. Opt. 25, 328-328 (1986)
https://www.osapublishing.org/ao/abstract.cfm?uri=ao-25-3-328

References

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  1. R. G. Lamont, K. O. Hill, D. C. Johnson, “Tuned-Port Biconical Taper Fiber Splitters: Fabrication from Dissimilar Low Mode-Number Fibers,” Opt. Lett. 10, 46 (1985).
    [Crossref] [PubMed]
  2. A. W. Snyder, “Coupling of Modes on a Tapered Dielectric Cylinder,” IEEE Trans. Microwave Theory Tech. MTT-18, 383 (1970).
    [Crossref]
  3. J. Bures, S. Lacroix, Jean Lapierre, “Analyse d'un Coupleur Bidirectionnel à Fibres Optiques Monomodes Fusionnées,” Appl. Opt. 22, 1918 (1983).
    [Crossref] [PubMed]
  4. R. G. Lamont, Communications Research Centre; private communication.
  5. H. Kuwaharo, M. Sasaki, N. Tokoyo, “Efficient Coupling from Semiconductor Lasers into Single-Mode Fibers with Tapered Hemispherical Ends,” Appl. Opt. 19, 2578 (1980).
    [Crossref]
  6. A. W. Snyder, J. D. Love, Optical Waveguide Theory (Chapman & Hall, New York, 1983), Chap. 19, p.407.
    [Crossref]
  7. Ref. 6, p. 341.
  8. A. Yariv, P. Yeh, Optical Waves in Crystals (Wiley, New York, 1984), pp. 177–187.

1985 (1)

1983 (1)

1980 (1)

1970 (1)

A. W. Snyder, “Coupling of Modes on a Tapered Dielectric Cylinder,” IEEE Trans. Microwave Theory Tech. MTT-18, 383 (1970).
[Crossref]

Bures, J.

Hill, K. O.

Johnson, D. C.

Kuwaharo, H.

Lacroix, S.

Lamont, R. G.

Lapierre, Jean

Love, J. D.

A. W. Snyder, J. D. Love, Optical Waveguide Theory (Chapman & Hall, New York, 1983), Chap. 19, p.407.
[Crossref]

Sasaki, M.

Snyder, A. W.

A. W. Snyder, “Coupling of Modes on a Tapered Dielectric Cylinder,” IEEE Trans. Microwave Theory Tech. MTT-18, 383 (1970).
[Crossref]

A. W. Snyder, J. D. Love, Optical Waveguide Theory (Chapman & Hall, New York, 1983), Chap. 19, p.407.
[Crossref]

Tokoyo, N.

Yariv, A.

A. Yariv, P. Yeh, Optical Waves in Crystals (Wiley, New York, 1984), pp. 177–187.

Yeh, P.

A. Yariv, P. Yeh, Optical Waves in Crystals (Wiley, New York, 1984), pp. 177–187.

Appl. Opt. (2)

IEEE Trans. Microwave Theory Tech. (1)

A. W. Snyder, “Coupling of Modes on a Tapered Dielectric Cylinder,” IEEE Trans. Microwave Theory Tech. MTT-18, 383 (1970).
[Crossref]

Opt. Lett. (1)

Other (4)

R. G. Lamont, Communications Research Centre; private communication.

A. W. Snyder, J. D. Love, Optical Waveguide Theory (Chapman & Hall, New York, 1983), Chap. 19, p.407.
[Crossref]

Ref. 6, p. 341.

A. Yariv, P. Yeh, Optical Waves in Crystals (Wiley, New York, 1984), pp. 177–187.

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Figures (9)

Fig. 1
Fig. 1

Plot of fiber diameter vs distance along the fiber for taper no. 4. The crosses represent experimentally measured data and the solid line is a least-squares fit to the data.

Fig. 2
Fig. 2

Transmission characteristics of taper no. 4 as a function of wavelength and the taper immersed in media of different refractive indices.

Fig. 3
Fig. 3

Plot of fiber diameter vs distance along the fiber for taper no. 9. The crosses represent experimentally measured data and the solid line is a least-squares fit to the data.

Fig. 4
Fig. 4

Transmission characteristics of taper no. 9 as a function of wavelength. For the data displayed in the upper portion of the figure a mode filter was used to restrict propagation to the HE11 mode. For the lower portion no mode filter was used. The scale divisions for the ordinate in both portions of the figure are arbitrary, with the base lines representing zero transmission.

Fig. 5
Fig. 5

Transmission characteristics of a 5-mm taper (taper no. 11, upper portion) and a 3-mm taper (taper no. 6, lower portion) as a function of wavelength.

Fig. 6
Fig. 6

Plots of the fiber diameter vs distance along the fiber for tapers nos. 11 and 6.

Fig. 7
Fig. 7

Transmission characteristics of taper no. 13 as a function of wavelength. The inset trace shows the data for an expanded ordinate scale.

Fig. 8
Fig. 8

Calculated transmission characteristics for taper no. 13. The inset trace shows the experimentally determined fiber diameter (crosses) and the least-squares fit (solid line) to the data. The inset trace is scaled the same as Figs. 1, 3, and 6, i.e., 1 ordinate scale division = 20 μm of diameter and 1 abscissa scale division = 1 mm of distance along the fiber.

Fig. 9
Fig. 9

Calculated transmission characteristics for taper no. 11 (upper portion) and taper no. 6 (lower portion) as a function of wavelength.

Equations (1)

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Δ β = λ ( 5.520 2 2.405 2 ) 4 π exp ( 2 / V ) n clad ρ 2 ,

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