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N4375B Datasheet(PDF) 4 Page - Agilent(Hewlett-Packard) |
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N4375B Datasheet(HTML) 4 Page - Agilent(Hewlett-Packard) |
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4 / 20 page  4 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. |
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