Numerical aperture of single-mode photonic crystal fibers

Author

Mortensen, Niels Asger ; Folken, Jacob Riis ; Skovgaard, Peter M W ; Broeng, Jes

Author_Institution

Crystal Fiber A/S Co., Birkerod, Denmark

Volume

14

Issue

8

fYear

2002

Firstpage

1094

Lastpage

1096

Abstract

We consider the problem of radiation into free space from the end-facet of a single-mode photonic crystal fiber (PCF). We calculate the numerical aperture NA = sin /spl theta/ from the half-divergence angle /spl theta/ /spl sim/ tan/sup -1/ (/spl lambda///spl pi//spl omega/) with /spl pi//spl omega//sup 2/ being the effective area of the mode in the PCF. For the fiber first presented by Knight et al. (1996), we find a NA /spl sim/ 0.07 which compares to standard fiber technology. We also study the effect of different hole sizes and demonstrate that the PCF technology provides a large freedom for NA engineering. Comparing to experiments we find good agreement.

Keywords

optical fibre theory; photonic band gap; NA engineering; PCF; PCF technology; effective area; end-facet; free space; half-divergence angle; hole sizes; numerical aperture; single-mode photonic crystal fibers; standard fiber technology; Apertures; Equations; Jacobian matrices; Light scattering; Optical fibers; Optical scattering; Particle scattering; Photonic crystal fibers; Silicon compounds; Size control;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2002.1021980

Filename

1021980