User Manual

Operating Your Chromatic Dispersion Analyzer

36 FTB-5800

Measuring Chromatic Dispersion

You can perform both single and multiple acquisitions on fibers.

To perform multiple acquisitions on the same fiber you must define the

number of measurements and the interval between them.

The average time between acquisitions must be of at least five minutes.

The five-minute period takes into account the time the application might

take to characterize the fiber link, depending on the quality of the signal. In

order for the value entered here to be valid, you must add five minutes to

the estimated acquisition time.

If you stop an acquisition before it is complete, the results acquired until

then will be displayed. However, in some cases, a minimum number of

points must be acquired for the application to calculate chromatic

dispersion and display a trace (for example, at least three points for the

3-Term Sellmeier type and at least five for the 5-Term Sellmeier).

To perform single or multiple acquisitions on a fiber:

1. If necessary, create a file (see Creating a File on page 35).

2. Set the general acquisition parameters as explained in Setting Up Your

Chromatic Dispersion Analyzer on page 13.

3. On the Parameters tab, click the Multiple Acquisitions button to

access the parameters dialog box.

IMPORTANT

Do not change the test fiber between two acquisitions of a

multiple-measurement test since parameters set for a specific fiber

may not apply to all fibers.