Enhanced Color Figures for

Modal "Cutoff" in Microstructured Optical Fibers

 

Boris T. Kuhlmey1,2, Ross C. McPhedran2 and C. Martijn de Sterke2

1 School of Physics, University of Sydney, NSW 2006, Australia

2 Institut Fresnel, Unité Mixte de Recherche du CNRS 6133, Faculté des Sciences et Techniques de Saint Jérôme, 13397 Marseille Cedex 20, France

 

Optics Letters 27, pp. 1684-1686 (2002)

©2002 Optical Society of America

 

 

 

 

FIG. 1:  Im(neff) as a function of wavelength/pitch, for a structure of 8 rings of holes in silica at a wavelength of l = 1.55µm for several diameter on pitch ratios. Im(neff) decreases monotonically with increasing d/L, as this parameter takes the values 0.40 (1), 0.41, 0.42, 0.43, 0.45, 0.46, 0.48 0.49, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75 (14).

 

 

FIG.2:  Variation of different physical quantities during the  transition, for a MOF with d/L  = 0.55 used at l = 1.55 µm. Curves (1) to (3) are Im(neff)  for 4, 8 and 10 rings, curves 4 to 7 are Q , Reff/L , Aeff/L2 and M  as defined in the text, for 8 rings. The points (a-d) indicate the position of the  field plots of Fig. 3.

 

FIG. 3: Density plots of the real part of the z component of the  Poynting vector of the second mode, for four values of the pitch around the localization transition, for a structure of 8 rings of holes with a diameter on pitch ratio of  d/L  =0.55. (a): cladding filling state  (l/L = 0.81), (b,c):  transition states (b:  l/L = 0.599, c: l/L = 0.537), (d) localized state  l/L =0.445. The corresponding points are marked on Fig. 2.

 

FIG. 4: Phase diagram of the second mode. The different curves  correspond to different definitions of the transition point. In the lower region the second mode is confined and the fiber is therefore dual moded. The dashed vertical line shows the approximation to the limit of the endlessly single mode regime.

 

 

 

 

 

 

Fig. 1 © 2002 Optical Society of America, Fig. 2-4 in their color versions © 2002 by the authors. All rights reserved. Please feel free to download and use these images. We would be grateful if you let us know about any citations of our papers, or any published use of these images.