Performance Verification
OI1125 E/O Transmitter Instruction Manual
41
9. In the Bandwidth field, select 12.50 GHz from the drop-down menu.
10. Recall the 12.500 Gb/s bit rate on the BERT and repeat steps 1 through 6 for
the 12.500 Gb/s bit rate.
11. Keep the test setup connected for the next test.
The modulator polarity test uses an eye pattern for a pass/fail test. The eye
pattern crossing point is adjusted with the BERT, and the crossing point shift
direction is observed on the oscilloscope.
Test Overview.
1. Keep the equipment setup as shown in Figure 14 on page 36.
2. Set the BERT parameters.
3. Set the oscilloscope measurement parameters.
4. Preview the eye pattern.
5. Take measurements.
BERT.
Set the BERT parameters as follows:
1. Recall the 9.953280 GB/s bit rate.
2. Set the pattern to PRBS–31.
3. Disable the adjustable duty cycle.
4. Turn off the Data Crossing Point Adjust.
5. Set the mark ratio to 1/2.
6. Set the trigger output to 1/32 clock.
7. Turn the data output on, and set the data amplitude to 1.5 V
p–p
.
Oscilloscope.
Set the TDS8000 settings as follows:
NOTE
. Due to differences in oscilloscope firmware, your setup steps may differ
slightly.
1. From the toolbar, select Setup
→
Vertical.
2. Click the Optical>> button.
Modulator Polarity
Summary of Contents for OI1125
Page 4: ......
Page 8: ...Table of Contents iv OI1125 E O Transmitter Instruction Manual...
Page 20: ...Getting Started 8 OI1125 E O Transmitter Instruction Manual...
Page 30: ...Operating Basics 18 OI1125 E O Transmitter Instruction Manual...
Page 36: ...Specifications 24 OI1125 E O Transmitter Instruction Manual...
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Page 42: ...Theory of Operation 30 OI1125 E O Transmitter Instruction Manual...
Page 72: ...Performance Verification 60 OI1125 E O Transmitter Instruction Manual...