Premium
Effect of axial sinusoidal size variation on the modal characteristics of an annular optical fiber
Author(s) -
Singh Vivek,
Prasad B.,
Ojha S. P.
Publication year - 2001
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/mop.1400
Subject(s) - modal , eigenvalues and eigenvectors , cross section (physics) , propagation constant , optics , microwave , mathematical analysis , physics , modal analysis , constant (computer programming) , mathematics , geometry , materials science , acoustics , vibration , computer science , quantum mechanics , polymer chemistry , programming language
This paper considers a new lightguide with a circular annular core cross section varying periodically in size along the propagation axis. We report an analytical study of the modal properties of this structure using the weak guidance approximation and considering vector boundary conditions. The characteristic eigenvalue equation is derived. As expected, the z ‐component of the propagation vector β is found to depend on the variable z , the axial coordinate. The propagation constant β is computed and plotted against z for some low‐order modes (modal index ν=0). These curves show an oscillatory periodic behavior. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 31: 211–214, 2001.