User’s Manual for Palm Optical Fiber Tester
Shineway Technologies, Inc.
- 32 -
flange
Fiber to be tested
Optical Power Meter
λ
ShinewayTech
®
dB
dBm
Zero
uW
Ref
Set
dBm
AUTO OFF
nm
Stabilized Laser Source
λ
ShinewayTech
®
uW
dBm
CW
MOD
dBm
AUTO OFF
nm
Emitting optical jumper
Receiving optical jumper
P3
Front end
Reverse end
flange
On
Off
On
Off
F
IGURE
22.
R
EVERSE LOSS TESTING
To ensure the accuracy of measurement, optical connectors should be kept clean.
In the process of measurement, please always avoid looking directly into open
optic fiber, optical output, optical connectors or other laser source, for it might
cause eye injuries.
5.3 Locate a Break within a Fiber by Visible Laser
Source
The VLS-20 injects visual red light into a fiber. The visible light escapes from the fiber
wherever the continuity is interrupted. A break always generates a highly visible output. If
the fiber is only under stress, a smaller effect may be produced. In general, however, if any
light is seen escaping from the fiber, it is an unmistakable sign that there is a problem that
must be repaired, as shown in Figure23.
The light in jacketed fiber is heavily attenuated; sometimes it necessary to darken the
room to see where the light is escaping from the fiber and locate the break.
