3
There
is
a
slight
delay
while
the
application
is
initialized,
and
then
the
values
of
/4
and
/2
on
the
display
begin
to
change
.
12.
When
the
application
is
running,
read
the
value
for
the
response
of
the
DUT
to
a
depolarised
signal
from
the
display
for
the
power
sensor
.
Example:
Measuring
a
P
olarization
Dependent
Loss
T
o
measure
the
sensitivity
to
polarization,
apply
a
quasi-random
polarization
to
the
(DUT),
the
steps
are
i.
Set
the
polarizing
lter
.
ii.
Set
the
scanning
speed
to
Slow .
iii.
Set
the
power
meter
to
record.
iv
.
Start
the
scan,
and
record
the
readings
for
dierent
polarization
states
.
v
.
Analyze
the
results
.
F
or
this
example
,
you
will
need,
apart
from
the
polarization
controller
,
a
laser
source
,
and
a
power
meter
(in
the
description
below
,
an
HP
8153A
Multimeter
with
a
laser
module
and
a
sensor
module
are
used).
A
roll
of
ber
will
act
as
a
suitable
DUT
.
1.
With
both
instruments
switched
o,
connect
the
laser
source
to
the
polarization
controller
.
2.
Connect
the
polarization
controller
to
the
power
meter
.
Setup
for
setting
the
position
of
the
polarizing
lter
.
3.
Switch
on
both
instruments
,
and
enable
the
laser
source
.
Scanning
the
P
oincare
Sphere
3-5