Title :
Failure of the scalar approximation near cutoff frequency of a step-index fiber mode
Author :
Romanova, Elena A.
Author_Institution :
Saratov State Univ., Russia
Abstract :
The feasibility of the scalar approximation used in the theory of weakly-guiding optical fibers is considered near the cutoff frequency of the HE1n(LP0n) mode. The asymptotic behavior of polarisation corrections for transverse and longitudinal wavenumbers of a lossy fiber mode is investigated both analytically and numerically. These results as well as the transmittance calculated for an irregular fiber consisting of single-mode and bimodal segments demonstrate the failure of scalar approximation near the cutoff frequency
Keywords :
optical fibre losses; optical fibre polarisation; optical fibre theory; asymptotic behavior; bimodal segment; cutoff frequency; irregular fiber; longitudinal wavenumbers; lossy fiber mode; polarisation corrections; scalar approximation; single-mode segment; step-index fiber mode; transmittance; transverse wavenumbers; weakly-guiding optical fibers; Cutoff frequency; Eigenvalues and eigenfunctions; Equations; Helium; Optical fiber losses; Optical fiber polarization; Optical fiber theory; Optical fibers; Optical surface waves; Sheet materials;
Conference_Titel :
Transparent Optical Networks, 2001. Proceedings of 2001 3rd International Conference on
Conference_Location :
Cracow
Print_ISBN :
0-7803-7096-1
DOI :
10.1109/ICTON.2001.934712
