OLT-85/OLT-85P
81
13 A
PPENDIX
- R
EFERENCING
M
ETHODS
L
OOPBACK
AND
R
EMOTE
R
EFERENCING
Fig. 30 One jumper reference - bidirectional (switching source and
powermeter mode)
Measured loss = Δ
Conn. 2
+ Δ
FiberUnderTest
+ Δ
Conn. 3
This reference removes any loss at the connection between the
instrument in source mode and the reference test jumper (both
directions). However, the loss at the connection from instrument
in source mode‘s reference jumper to the fiber under test and
the connection from the fiber under test to the instrument in
powermeter mode‘s reference jumper will not be referenced out.
Two jumper cable reference
This reference removes the losses at Connection 1,
Connection 2, and Connection 4 from the measurement.
C1
C4
C1
C4
TX
RX
RX
TX
S
P
P
S
C1
Connection 1
C4
Connection 4
TX
Laser source output (Transmitter)
RX
Powermeter input (Receiver)
S
Source device
P
Powermeter device