Page 338 - Optical Communications Essentials

Test and Measurement

328 Chapter Nineteen

Figure 19.4. Compact, portable
multipurpose test instrument for
use in field environments. (Model
FOT-920, provided courtesy of
EXFO; www.exfo.com.)

TABLE 19.3. Characteristics of Laser Source Instruments Used for Test Support

Parameter Tunable source Broadband source
Spectral output range Selectable: for example, 1370–1495 Peak wavelength 25nm
or 1460–1640nm
Total optical output power Up to 8dBm 3.5mW (5.5dBm) over a 50-nm range
Power stability 0.02dB 0.05dB
Wavelength accuracy 10pm Not applicable

19.4. Test-Support Lasers

Specialized light sources are desirable for testing optical components. Table 19.3
lists the characteristics of two such laser source instruments used for test
support.
Tunable laser sources are important instruments for measurements of the
wavelength-dependent response of an optical component or link. A number of

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