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Effect of axial linear and sinusoidal variation of the core refractive index on the propagation of some low‐order modes in an optical fiber
Author(s) -
Pandey P. C.,
Ojha S. P.
Publication year - 2000
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/1098-2760(20010220)28:4<265::aid-mop1013>3.0.co;2-e
Subject(s) - refractive index , optics , core (optical fiber) , variation (astronomy) , modal , optical fiber , microwave , physics , step index profile , normalized frequency (unit) , graded index fiber , materials science , fiber optic sensor , quantum mechanics , astrophysics , polymer chemistry , phase locked loop , frequency synthesizer , phase noise
In this communication, we report the result of a preliminary study of the effect of an axial variation of the core refractive index n 1 ( z ) on the propagation of some lower order modes in optical fibers. We take two types of axial variation of n 1 ( z ): 1) linear, and 2) sinusoidal. The modal propagation properties are obtained under the weak guidance approximation. The consequent dependence of the propagation parameter β with a z ‐coordinate is shown for both types of core refractive index dependence on z . We find that, for both a linear and sinusoidal variation of n 1 ( z ), β fluctuates, but this happens more smoothly and symmetrically in the latter case. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 28: 265–267, 2001.