Dual-Wavelength Sm Loss Measurements - Greenlee 560XL Manual De Instrucciones

560XL • 567XL • 568XL • 570XL • 573XL • 577XL • 578XL • 580XL

Dual-Wavelength SM Loss Measurements

The 580XL dual laser is are used to measure the attenuation of single-mode
fiber optic links.
Dual-wavelength testing at both the 1310 nm and 1550 nm transmission
windows is required when the following conditions are encountered:
• Telephony systems now operating in the 1310 nm transmission window
are likely to be upgraded for operation at 1550 nm in the future.
Consequently, it is important to validate any newly installed link at both
1310 nm and 1550 nm now to ensure that all specifications can be met
in the future. Unless measured and verified at the time of installation,
unexpected fiber attenuation and excessive bend losses may render the
link useless for later commissioning at 1550 nm. While fiber attenua-
tion decreases at longer wavelengths, microbend and macrobend losses
increase.
• The telecommunication system is now operating in both the 1310 nm and
1550 nm transmission windows. Therefore, dual-wavelength acceptance
testing is required to be performed at the present time.
The following test procedure complies with TIA/EIA-526-7 (OFSTP-7,
Method A), Attenuation of Installed Single-mode Fiber Link.
27