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W
aveform
T
est
Eye
diagrams
are
important
tools
to
characterize
the
waveform
performance
of
a
laser
transmitter
.
An
eye
diagram
is
generated
on
an
optical
oscilloscope
by
observing
the
data
output
from
the
laser
while
triggering
the
oscilloscope
from
a
related
clock
signal.
Typically
only
the
optical
data
signal
is
available
,
so
the
trigger
must
be
derived
directly
from
the
data.
The
trigger
can
be
generated
usually:
from
a
recovered
clock
signal
from
the
data
using
an
electrical
splitter
from
the
data
using
an
optical
splitter
The
trigger
from
a
recovered
clock
uses
a
small
portion
of
the
optical
signal
and
feeds
it
to
circuitry
that
reconstructs
the
clock
signal
from
the
data.
The
trigger
on
data
can
be
made
in
two
ways:
electrically
and
optically
.
Electrical
uses
a
small
portion
of
the
electrical
signal
(electrical
coupler)
coming
out
from
an
O/E
converter
and
applies
it
to
the
oscilloscope
trigger
input.
In
case
of
triggering
on
an
optical
data
signal,
an
optical
coupler
carrys
a
small
portion
of
the
optical
data
signal
to
a
high
gain
avalanche
photodiode
O/E
converter
and
applies
it
to
the
oscilloscope's
trigger
input.
Triggering
on
data
versus
triggering
on
clock
Trigger
signal
generated
from
the
pattern
will
produce
a
timing
reference
on
either
a
rising
or
falling
edge
.
A
group
of
bits
at
\0"
or
\1"
will
provide
a
trigger
when
the
stream
appears
and
when
the
stream
changes
.
Therefore
,
depending
on
how
many
bits
are
displayed
on
the
oscilloscope
screen,
only
a
minority
of
the
bits
in
the
patterns
will
yield
trigger
events
.
An
eye
diagram
will
be
generated,
but
will
not
be
a
complete
representation
of
an
entire
pattern
(only
the
clock
recovery
trigger
provides
this).
Eye
diagram
measurements
,
triggered
with
a
signal
derived
from
the
data,
will
be
inaccurate
.
3-3
Содержание 83447A
Страница 1: ...User and Service Guide HP 83447A Lightwave Trigger Receiver ...
Страница 3: ...Printing History HP Part Number Edition Date 83447 90002 Edition 1 April 1996 iii ...
Страница 10: ......
Страница 15: ...1 General Information ...
Страница 25: ...Declaration of Conformity 1 11 ...
Страница 27: ...General Information Electrostatic Discharge Information Figure 1 3 Example of a static safe work station 1 13 ...
Страница 29: ...2 Installation and Preparation for Use ...
Страница 36: ...Installation and Preparation for Use Installing the HP 83447A Figure 2 3 AC power cables available 2 8 ...
Страница 51: ...3 Using the HP 83447A ...
Страница 55: ...4 Servicing the HP 83447A ...
Страница 93: ...Servicing the HP 83447A Replaceable parts Figure 4 8 HP 83447A assembly level replaceable parts 4 39 ...
Страница 95: ...Servicing the HP 83447A Replaceable parts Figure 4 9 HP 83447A replaceable hardware 4 41 ...
Страница 97: ...Index ...
Страница 102: ...W warranty 2 13 warranty information viii waveform test measuring eye diagram 3 3 Index 6 ...