IDEAL INDUSTRIES FIBERTEK, Руководство пользователя

Страница: 110 / 147

Chapter 6
Fiber Optics Diagnostics (TRACETEK)
¾ Here, a 45 m cable is tested with the MED Resolution mode. Although the length
of the cable is correctly identified, there is so much power that the receiver is
detecting echoes in the cable. Choosing the HIGH-Resolution mode should help.
Figure G
¾ In the HIGH-Resolution mode the power output is decreased and the echoes are
eliminated. Also that notice the dead-zones of the first and last events are
noticeably narrower.
Figure H
Q3: Why is TRACETEK only available in 1300 nm modules?
A3: Since TRACETEK does not make attenuation measurements, the reason for
choosing a 1300 nm laser is based purely on performance. Multimode fiber has less
than half the attenuation at 1300nm than it does at 850 nm. By using the 1300 nm
laser, TRACETEK can be used to test much longer cables than it could with an 850 nm
laser whose power attenuates very rapidly.
Q4: Does TRACETEK support single mode testing?
A4: Yes. TRACETEK is also available in a single mode kit with a 1310 nm laser. For
single mode fibers the attenuation difference between 1310 nm and 1550 nm is small
enough that there is no major performance gain obtained by operating at 1550 nm. In
this case the 1310 nm laser helps make TRACETEK the most affordable solution for
reflectance testing of single mode fiber.
6-12
www.vemco.pl