N4691B Просмотр технического описания (PDF) - HP => Agilent Technologies
Номер в каталоге
Компоненты Описание
производитель
N4691B Datasheet PDF : 20 Pages
| |||
Integrated optical power meter
In applications where optical power dependence character-
ization is needed, the average power meter can be used to
set the exact average output power of the LCA transmitter
by connecting the LCA optical transmitter output, optionally
through an optical attenuator, to the LCA optical receiver in-
put. By adjusting the transmitter output power in the LCA
user interface or the optical attenuation, the desired trans-
mitter optical power can be set.
In cases where an unexpectedly low responsivity is mea-
sured from the device under test, it is very helpful to get a
fast indication of the CW optical power that is launched into
the LCA receiver. The cause might be a bad connection or a
bent fiber in the setup. For this reason too, a measurement
of the average optical power at the LCA receiver is very help-
ful for fast debugging of the test setup.
Selectable output power of the transmitter
Most PIN diodes and receiver optical subassemblies (RO-
SA’s) need to be characterized at various average optical
power levels. In this case it is necessary to set the average
input power of the device under test to the desired value.
The variable average optical output power of the LCA trans-
mitter offers this feature. Together with an external optical
attenuator, this range can be extended to all desired optical
power levels.
Group delay and length measurements
In some applications it is necessary to determine the elec-
trical or optical length of a device. With the internal length
calibration of the electro-optical paths with reference to the
electrical and optical inputs or outputs, it is possible to de-
termine the length of the device under test
Large signal measurements
LCA S21 measurements are typically small-signal linear
transfer function measurements. If an electro-optical com-
ponent must be tested under large signal conditions, normal
balanced measurements might lead to wrong measurement
results.
The PNA-X based version of the LCA offers true balanced
measurements for differential ports by offering two indepen-
dent high power RF sources. With this setup the LCA mea-
sures the correct S21 transfer function of E/O components,
even in the nonlinear regime.
To stimulate O/E components like PIN-TIA receivers under
optical large signal conditions, the PNA-X based LCA offers
a variable optical modulation index up 50%.
External optical source input
For applications where test of opto-electric devices need to
be done at a specific optical wavelength, the N4375B-050
offers an external optical input to the internal modulator
where an external tunable laser can be applied. As modula-
tors are polarization sensitive devices, this input is a PMF
input to a PMF optical switch to maintain the polarization
at the modulator input.
4
Share Link: 