### Abstract

A study is made of the modal properties of electromagnetic waves propagating along a dielectric fiber having a periodically varying core cross-sectional size along the direction of propagation. The maximum variation of the core radius is assumed to be small, and a full cycle of variation occurs over a large change in the axial variable z compared with the core radius. The general characteristic equation and cutoff conditions are derived, assuming that the component of the propagation vector β along the axis varies with the axial coordinate z. In general, β is complex, showing an attenuation or a reinforcement because of alternate flair and constriction. As an illustration, a numerical estimate of ∂β / ∂z as a function of z is made for some modes with simple and special properties where attenuation is negligible, and the axial electric and magnetic fields are in phase. The method can easily be extended to include more general cases by means of straightforward but tedious numerical work.

Original language | English |
---|---|

Pages (from-to) | 335-339 |

Number of pages | 5 |

Journal | Microwave and Optical Technology Letters |

Volume | 11 |

Issue number | 6 |

Publication status | Published - 20 Apr 1996 |

Externally published | Yes |

### Fingerprint

### Keywords

- Electromagnetic wave propagation
- Optical waveguides

### ASJC Scopus subject areas

- Electrical and Electronic Engineering
- Atomic and Molecular Physics, and Optics

### Cite this

*Microwave and Optical Technology Letters*,

*11*(6), 335-339.

**On electromagnetic wave propagation in an optical fiber having a core radius with a periodic axial variation.** / Sinha, Sangeeta; Khastgir, P.; Ojha, S. P.; Choudhury, Pankaj Kumar.

Research output: Contribution to journal › Article

*Microwave and Optical Technology Letters*, vol. 11, no. 6, pp. 335-339.

}

TY - JOUR

T1 - On electromagnetic wave propagation in an optical fiber having a core radius with a periodic axial variation

AU - Sinha, Sangeeta

AU - Khastgir, P.

AU - Ojha, S. P.

AU - Choudhury, Pankaj Kumar

PY - 1996/4/20

Y1 - 1996/4/20

N2 - A study is made of the modal properties of electromagnetic waves propagating along a dielectric fiber having a periodically varying core cross-sectional size along the direction of propagation. The maximum variation of the core radius is assumed to be small, and a full cycle of variation occurs over a large change in the axial variable z compared with the core radius. The general characteristic equation and cutoff conditions are derived, assuming that the component of the propagation vector β along the axis varies with the axial coordinate z. In general, β is complex, showing an attenuation or a reinforcement because of alternate flair and constriction. As an illustration, a numerical estimate of ∂β / ∂z as a function of z is made for some modes with simple and special properties where attenuation is negligible, and the axial electric and magnetic fields are in phase. The method can easily be extended to include more general cases by means of straightforward but tedious numerical work.

AB - A study is made of the modal properties of electromagnetic waves propagating along a dielectric fiber having a periodically varying core cross-sectional size along the direction of propagation. The maximum variation of the core radius is assumed to be small, and a full cycle of variation occurs over a large change in the axial variable z compared with the core radius. The general characteristic equation and cutoff conditions are derived, assuming that the component of the propagation vector β along the axis varies with the axial coordinate z. In general, β is complex, showing an attenuation or a reinforcement because of alternate flair and constriction. As an illustration, a numerical estimate of ∂β / ∂z as a function of z is made for some modes with simple and special properties where attenuation is negligible, and the axial electric and magnetic fields are in phase. The method can easily be extended to include more general cases by means of straightforward but tedious numerical work.

KW - Electromagnetic wave propagation

KW - Optical waveguides

UR - http://www.scopus.com/inward/record.url?scp=0030126602&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030126602&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0030126602

VL - 11

SP - 335

EP - 339

JO - Microwave and Optical Technology Letters

JF - Microwave and Optical Technology Letters

SN - 0895-2477

IS - 6

ER -