Polarization Extinction Ratio Meter PEM-340
4-1
4
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.
4-2. Offset Cancel
4-1. Real Time Display
The PEM-340 displays simultaneously, and in real time, values for the three critical parameters
required for the alignment and characterisation of polarization maintaining ber and polarization
ber 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-340 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-340 is thus suitable
for automated measurements in production environments and for integration into fully automatic
alignment systems.
4-3. Communication Interfaces
In addition to the communication interfaces described above, the PEM-340 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.
4-4. Analogue Data Output
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