Anritsu MN4765B, Operation Manual

Page: 18 / 31

3-4 PN: 10410-00742 Rev. H O/E Module MN4765B OM
3-2 E/O Measurements Operation
Measurement Tips
Most E/O and O/E fiber optic components will exhibit some polarization
dependence. Understanding the effects of polarization is essential to
maximizing measurement efficiency. Stability is another important concern.
Standard single mode fibers can alter polarization states simply by adding
stress to the fiber. The following tips can help enhance the measurements of
E/O and O/E components:
• Measurement dynamic range can be maximized using a simple
polarization controller before a polarization sensitive device. The VNA
can be used to monitor the maximum RF output level as the
polarization is adjusted.
• Polarization Maintaining Fiber (PMF) is an easy way to minimize
polarization changes as a result of fiber turns and bends.
The transfer function measurement of a 40 Gb/s modulator using the
Anritsu VectorStar VNA is shown in
Figure 3-2 .
Figure 3-2. Transfer Function Measurement of a 40 Gb/s Modulator using the
VectorStar VNA.