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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 70, Iss. 4 — Apr. 1, 1980
  • pp: 405–411

Weakly guiding optical fibers

Allan W. Snyder  »View Author Affiliations

JOSA, Vol. 70, Issue 4, pp. 405-411 (1980)

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Maxwell’s equations are reformulated to describe electromagnetic propagation along weakly guiding fibers of arbitrary refractive-index profile. The reformulation is particularly powerful for solving radiation from sources or scatterers within the fiber, leading to the most concise expressions possible. For example, radiation from sources in weakly guiding fibers is found by an elementary modification of the standard method for determining radiation from sources in free space. When the source has circular symmetry, the radiation field equals the free-space result multiplied by a factor that accounts for the presence of the fiber. Detailed examples are given for point and tubular sources.

© 1980 Optical Society of America

Allan W. Snyder, "Weakly guiding optical fibers," J. Opt. Soc. Am. 70, 405-411 (1980)

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  1. A. W. Snyder, "Asymptotic expressions for eigenfunctions and eigenvalues of dielectric or optical waveguides," IEEE Trans. Microwave Theory Tech. MTT-17, 1130–1138 (1969).
  2. D. Gloge, "Weakly guiding fibers," Appl. Opt. 10, 2252–2258 (1971).
  3. D. Marcuse, Theory of Dielectric Optical Waveguides (Academic, New York, 1974).
  4. D. Marcuse, Light Transmission Optics (Van Nostrand, New York, 1972).
  5. H. G. Unger, Planar Optical Waveguides and Fibres (Clarendon, Oxford, 1977).
  6. J. A. Arnaud, Beam and Fiber Optics (Academic, New York, 1976).
  7. A. W. Snyder and W. R. Young, "Modes of optical waveguides," J. Opt. Soc. Am. 68, 297–309 (1978).
  8. (a) A. W. Snyder and R. A. Sammut, "Radiation modes of optical waveguides," Electron. Lett. 15, 4–5 (1979). (b) A. W. Snyder, "Continuous mode spectrum of a circular dielectric rod," IEEE Trans. Microwave Theory Tech. MTT-19, 720–727 (1971).
  9. A. W. Snyder and R. A. Sammut, "Radiation from optical waveguides: leaky mode interpretation," Electron. Lett. 15, 58–60 (1979).
  10. S. Ramo, J. R. Whinnery, and T. Van Duzer, Fields and Waves in Communication Electronics (Wiley, New York, 1965).
  11. C. H. Papas, Theory of Electromagnetic Wave Propagation (McGraw-Hill, New York, 1965).
  12. J. Mathews and R. L. Walker, Mathematical Methods of Physics (Benjamin, New York, 1965).
  13. A. W. Snyder, "Leaky-ray theory of optical waveguides of circular cross section," Appl. Phys. 4, 273–298 (1974).
  14. A. W. Snyder, "Radiation losses due to variations of radius on dielectric or optical fibres," IEEE Trans. Microwave Theory Tech. MTT-18, 608–615(1970).
  15. E. G. Rawson, "Analysis of scattering from fiber waveguides with irregular core surfaces," Appl. Opt. 13, 2270–2275 (1974).
  16. P. J. B. Clarricoats, "Optical fibre waveguides—a review" in Progress in Optics, edited by E. Wolf (North-Holland, Amsterdam, 1976).
  17. I. A. White and A. W. Snyder, "Radiation from dielectric optical waveguides: a comparison of techniques," Appl. Opt. 16, 1470–1472 (1977).
  18. To do this we assume ψ(β) =ψFS(β + Δβ), where β = kc1cosθ, i.e., we assume the radiation at observation angle θ equals that of free-space radiation at angle θ + Δθ. Now β enters Eq. (14) in the combination k2(r) - β2, whereas in free space it appears as k2c1 - β2. Thus for the step fiber, we rewrite k2(r) - β2 as k2c1 - {β2 +k2c1 - k2c0} calling the bracketed quantity (β + Δβ)2 or β for short. By replacing β in the free-space radiation expressions with (β2 + k2c1 - k2c0)½, or replacing Q by U we account for the shift. Equivalently, we can replace θ in the free-space radiation expressions by θ˜= θ + Δθ, where cos2θ ≅ cos2θ - θ2c(1 + θ2c) provided cos2θ >θ2c(1 + θ2c) and 0 < r≤ ≤ ρ.
  19. I. A. White, Radiation Losses in Dielectric Optical Waveguides, Ph.D. thesis, Australian National University, 1977 (unpublished).
  20. G. L. Yip, "Launching efficiency of the HE11 surface wave mode on a dielectric rod," IEEE Trans. Microwave Theory Tech. MTT-18, 1033–1041 (1970).

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