36
ORL-55
JDSU
5 O
PERATION
Return loss measurement
In the Return Loss mode a signal is send to the DUT
from the internal laser source. The power level reflected
from the DUT is measured and compared to the
transmitted signal. The result of the return loss is
displayed at the ORL-55.
The accuracy of the return loss measurement depends
highly on the quality of the optical connection at the
ORL-55.
Hence take care to keep the test connection very
clean.
In the case the display does not show “High” with the
port open:
Clean the test connection (see
„Cleaning the test port”
on page 48
)
Normalize the unit (see
„Normalizing” on page 37
).
Display in Return Loss Test mode
Fig. 11 Measurement display in Return Loss Test mode.
The functions are identical to relative measurement of
Power Meter mode (see
„Display in Power Meter mode”
on page 31
).
Note:
Please note, that the measurement values in
Return Loss Test mode are positive.
At one
wavelength
At two
wavelengths
