Santec PEM-320, Руководство по эксплуатации

Страница: 12 / 46

POLARIZATION EXTINCTION RATIO METER PEM-320
3-1
3
Features
An Offset Cancel function is provided to enable compensation for the dark current of the
photodetector. This provides improved accuracy and greater dynamic range even when low optical
powers are used.
3.2. Offset Cancel
3.1. Real Time Display
The PEM-320 displays simultaneously, and in real time, values for the three critical parameters
required for the alignment and characterisation of polarization maintaining fiber and polarization fiber
pigtailed components. These are the polarization extinction ratio (PER), optical power and
polarization angle. In addition, the optical power can be displayed in units of mW or dBm.
The PEM-320 can be used as a stand alone bench-top type measurement instrument. However, it also
boasts industry standard GPIB and RS-232C interfaces through which the unit can be fully controlled
and through which all parameters can be monitored. The PEM-320 is thus suitable for automated
measurements in production environments and for integration into fully automatic alignment systems.
3.3. Communication Interfaces
In addition to the communication interfaces described above, the PEM-320 has an analogue output for
monitoring of all the measured parameters. These signals are particularly useful as feedback signals
for the control loops of automated alignment systems. As an option, an output monitoring the signal
directly from the photodetector can also be provided.
3.4. Analogue Data Output