Geodesic
The weak inhomogeneous optical fiber
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 12, Tome 117 (1981), pp. 134-146

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The propagation of the non-stationary electromagnetic waves in the weak inhomogeneous circular optical fiber is described in this article by means of the space-timing ray method. The asymptotic formulae for these waves are given. 
@article{ZNSL_1981_117_a8,
     author = {A. P. Katchalov},
     title = {The weak inhomogeneous optical fiber},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {134--146},
     publisher = {mathdoc},
     volume = {117},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_117_a8/}
}
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A. P. Katchalov. The weak inhomogeneous optical fiber. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 12, Tome 117 (1981), pp. 134-146. http://geodesic.mathdoc.fr/item/ZNSL_1981_117_a8/