Relative Power; Reference Measurement - JDS Uniphase FI Series User Manual

ChaPter 2

Relative Power

Reference
Measurement
10
operation
Acquiring attenuation measurements (optical link loss) on optical components or fiber
optic links (e.g., fiber connectors, cable assemblies, installed fiber optic links) is done by
measuring the relative power level (dB) at the far end of the link or device under test.
Relative power level (attenuation measurement) is the amount of power lost (attenuated)
by the optical link being tested, measured in dB. The source of this power is typically a
handheld optical light source. This test determines whether the optical link is constructed
properly, either as a qualification test or when troubleshooting the network.
To measure attenuation, you must:
1.
Get a reference measurement
2.
Get an attenuation measurement
Note:
Loss is equal to the reference
measurement minus the attenuation
measurement.
Reference
Inspect
P
USer ManUaL
Fiber 1
P
Inspect
1.
INSPECT, and if necessary,
CLEAN both the ends of
reference fiber 1.
2.
Connect the optical light
source (OLS) to the power
meter using reference fiber 1.
3.
Press to turn both the
power meter and light source
(OLS) ON.
λ
4.
Press to select
wavelength.
5.
dB/dBm
Press and hold
the optical power meter.
REF flashes briefly on the power
meter indicate that the reference
level is saved.
Note: DO NOT disconnect the
reference fiber from the light
source (OLS).
6.
Press STORE to save reading
onto the device (the saved
number will flash once on the
display).
on