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Measuring Fiber Devices
Assumptions required for this optimization method
Assumption 1. The group delay can be modeled by the quadratic equation:
τ
(λ) =
g
is the dispersion slope, λ is the wavelength, λ
Where S
0
length, and L is the fiber length. The precise details of the quadratic fit to the data are not
critical; the only requirement is that the group delay curve should have the shape of a par-
abolic curve. In fact, the results presented here are valid even if the three-term or the five-
term Sellmeier fits are used, as those two models also have the parabolic shape. This
assumption is valid for systems consisting mostly of dispersion-shifted fiber.
Assumption 2. The dispersion slope S
persion slope, S
, is approximately 0.07 ps/ (nm
0
zero dispersion wavelength λ
of the measurement.
1-10
S
o
2
(λ − λ
)
L
ο
2
[in ps/(nm 2 ×km)] is known. For example, the dis-
0
2
×km) for most dispersion shifted fiber. The
need not be known but should lie within the spectral range
0
is the zero dispersion wave-
0
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