User’s Manual for Palm Optical Fiber Tester
Shineway Technologies, Inc.
- 31 -
Stabilized Laser Source
λ
ShinewayTech
®
uW
dBm
CW
MOD
dBm
AUTO OFF
nm
Optical Power Meter
λ
ShinewayTech
®
dB
dBm
Zero
uW
Ref
Se
t
dBm
AUTO OFF
nm
flange
Flange
Fiber to be tested
Emitting optical jumper
Receiving optical jumper
P2
Front end
Reverse end
On
Off
On
Off
F
IGURE
21.
F
ORWARD LOSS TESTING
3. Use the formula “FORWARD LOSS (dB) = P1 – P2”, take the dBm reading on the
power meter (P3) in step 2) and the source output power value (P1) in step 1). For example,
if P2 = -8.50dBm, and P1=-6.85dBm, then the FORWARD link loss is 1.65dB.
4.
Connect laser sources and optical power meters to their respective patch panel ports
using the test jumpers, as shown in Figure22. Calculate the reverse link loss using the
formula “REVERSE LOSS (dB) = P1 – P3”.
5.Report both forward and reverse loss values.
