Agilent Technologies 8504B - Page 253

FINAL TRIM SIZE : 7.5 in x 9.0 in
Specications
and
Regulatory
Information
Specications
Two-Event Spatial
Resolution
Description
Two-event
spatial
resolution
denes
the
physical
spacing
(in
air)
of
two
equal
magnitude
reections
such
that
the
responses
on
the
8504B
precision
reectometer
have
a
3
dB
valley
between
them
(averaging
o).
The
8504B is
basically
a
scanning
Michelson
interferometer
.
The
test
port
arm
is made
up
entirely
of
non-dispersion
shifted
ber
,
while
the
reference
arm
contains a
ber
portion
as
well
as
the
variable
open-beam
portion
of
the
scanning
mirror
of
the
interferometer
.
This
situation
does
not
aect
the
resolution
at
1300
nm.
However
at
1550
nm,
it
results
in
a
dierential
dispersion
between
the
two
arms
of
the
interferometer
which
is
seen
as
a
pulse
broadening
on
the
display
of
the
8504B
Precision
Reectometer
.
This
pulse
broadening
degrades
the
two-event
resolution
at
1550
nm,
having
minimal
eect
when
the
open-beam
path
in
the
reference
arm of
the
interferometer
is
short
(mirror
near
the
start of
its scan
range), but
increases
as
the
open-beam
path
becomes
longer
.
6-10
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