Exfo FastReporter 2 Manual do Utilizador descarregar pdf (Página 368)

100

101

Measuring Chromatic Dispersion: Theory

358 FastReporter 2

Using Data Fits to Obtain Dispersion

This section gives you details about the way EXFO uses the data fits to

obtain dispersion. Once group delays are computed, equations are fitted in

order to obtain dispersion, dispersion slope and zero-dispersion

wavelengths. The dispersion curve of typical singlemode fibers follows

certain equations used to interpolate zero-dispersion wavelength and

slope. The following table graph shows the equations applied to

singlemode fibers in specific wavelength ranges.

Fiber Type and

Wavelength Range

Expression for D

G.652 NDSF

G.653 DSF

1500 nm-1600 nm

G.655 NZDSF

up to 1560 nm

G.655 NZDSF

1530 nm-1565 nm (C Band)

1565 nm-1625 nm (L Band)

1200 nm  1600 nm

 AB

C

2–

++=

D  2B C

3–

–=

 AB

C++=

D  2B C+=

D 

D1560D 1530–

-------------------------------------------------



 1560–







D 1560+=

D 

D1565D 1530–

-------------------------------------------------



 1565–







D1565+=

D 

D 1625D 1565–

-------------------------------------------------



 1625–







D 1625+=

1 2 ... 363 364 365 366 367 368 369 370 371 372 373 ... 395 396

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