Comments on "A Simple Numerical Method for the Cutoff Frequency of a Single-Mode Fiber with an Arbitrary Index-Profile"
- 1 January 1982
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 30 (1) , 108-109
- https://doi.org/10.1109/tmtt.1982.1131027
Abstract
In the above paper, Sharma and Ghatak have proposed a numerical method for calculating the cutoff frequency of single mode operation in optical fibers with an arbitrary index profile. We want to comment on the validity of their results using their notations. The referenced paper requires in particular the knowl-edge of the boundary conditions on the modal field Psi and its derivatives at R=0. To this aim, Sharma and Ghatak have used a series solution method. Their series expansion [1, eq. (A. 1)] is valid only in the vicinity of an ordinary point but the point R=0 is a regular singular point for the scalar wave differential equation [1, eq. (A.3)].Keywords
This publication has 3 references indexed in Scilit:
- A Simple Numerical Method for the Cutoff Frequency of a Single-Mode Fiber with an Arbitrary Index-ProfileIEEE Transactions on Microwave Theory and Techniques, 1981
- Fundamental (HE_11) modes of graded optical fibersJournal of the Optical Society of America, 1979
- Cut-off frequency in radially inhomogeneous single-mode fibreElectronics Letters, 1977