EXFO PSO-100 Series Optical Sampling Oscilloscopes - Manual (Page 100)

Troubleshooting
92 PSO-100
Solving Common Problems
The sampled data looks very
noisy, jittery or distorted. The
software does not seem to be
able to synchronize the data.
³
The input signal is
too low.
³
The signal has
very poor OSNR
or suffers from
dispersion.
³
The waveform
format is
incorrect.
³
There are
frequency holes.
³
The data signal
suffers from large
phase noise.
³
The signal
wavelength is in
the 1567-1570 nm
span.
³
The internal
sampling pulse
source has not
locked yet.
³
Increase the
signal power
³
Try to use the
external clock
³
Set the
appropriate
waveform format
or use the
external clock.
³
Click clear.
³
Change the phase
tracking
algorithm
(Utilities >
Advanced
menu), or use the
external clock in
adaptive mode.
³
Use
1525-1565 nm.
³
Turn off the
optical input
signal. Wait and
let the unit warm
up until it locks.
My OTDM data jumps around
on the screen.
It is difficult to
synchronize a
sub-optimally
multiplexed data
signal.
Use the external
clock with a subrate
clock.
Problem Cause Possible Solution