Specialty Optical Fibers Handbook

where A

POH

is the peak amplitude, l

POH

is the peak center wavelength,

and s

POH

is the peak width. The macrobending loss, a

M

, is modeled by Walker

[28] as

a

M

¼ A

M

l

2

 exp M

1

l

1

2:478  M

2

lðÞ

3

hi

,(2:20f)

where A

M

, M

1

, and M

2

are parameters determined by the fiber properties

and the bend radius. For high-performance fibers, the excess loss term, a

XS

,

will normally be small and contain measurement error and noise, as well as

systematic errors associated with the accuracy of the various terms of the loss

model.

2.7 ORIGINS OF CHROMATIC DISPERSION

2.7.1 Introduction

An optical fiber’s dispersion is the tendency for the fiber to either broaden or

narrow a pulse as it travels along the fiber. The term chromatic dispersion is used

to refer to the change in pulse shape ...