
1
Y
ou
should
notice
that
the
power
reading
on
the
multimeter
is
approximately
half
the
value
set
on
the
laser
source
.
This
is
because
the
output
is
modulated
by
a
square
wave
with
a
50%
duty
cycle
.
Measuring
a
W
avelength
Characteristic
F
or
the
second
part,
we
assume
that
the
instruments
are
in
the
state
given
after
the
rst
task
(see
Figure
1-8).
W
e
now
want
to
measure
the
wavelength
characteristic
by
measuring
the
power
at
1nm
steps
between
1535nm
and
1545nm,
at
the
highest
power
level
possible
that
is
available
over
the
full
sweep
range
.
11.
On
the
laser
source
,
press
NNNNNNNNNNNNNNNNNNNN
Mod/CW
to
return
the
laser
source
to
CW
operation.
Setting
Up
the
W
avelength
Sweep
12.
On
the
laser
source:
a.
Press
4
W
A
VELENGTH
5 ,and
then
N
NNNNNNNNNNNNNNNNNNNNNN
-Sweep
.
b.
Type
in
1535
on
the
keypad
and
press
4
ENTER
5
to
set
the
start
wavelength
for
the
sweep
.
c.
Type
in
1545
on
the
keypad
and
press
4
ENTER
5
to
set
the
stop
wavelength
for
the
sweep
.
d.
Type
in
1
on
the
keypad
and
press
4
ENTER
5
to
set
the
size
of
the
wavelength
step
for
the
sweep
.
Figure
1-9.
Tunable
Laser
Source
Display
during
Setting
Up
for
the
W
avelength
Sweep
Getting
Started
1-11
Summary of Contents for 8167A
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Page 164: ...D Figure D 1 Test Setup for the Wavelength Tests D 4 Performance Tests ...
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