Tektronix OI1125, Instruction Manual

Page: 48 / 88

Performance Verification
36
OI1125 E/O Transmitter Instruction Manual
Modulator Checks
The following procedures check the RMS jitter and the polarity of the laser
waveform in the modulator circuit.
This test checks the RMS jitter on a histogram display of the leading edge of the
modulator output optical waveform.
Test Overview.
1. Set up the equipment as shown in Figure 14.
2. Set the BERT parameters.
3. Compensate the oscilloscope.
4. Set the oscilloscope measurement parameters.
5. Preview the waveform.
6. Take measurements.
Test Setup.
1. Connect the equipment as shown in Figure 14. A torque wrench is recom-
mended for securing the SMA connections to 7 to 10 lb-in (79 to 112 N-cm).
OI1125
D3186
Laser in
(FC/APC)
Modulator out
(FC/APC)
CSA8000/TDS8000 w/80C01
SMA cable
015-0561-00
Data
1/32
Clock
Trigger
Direct In
Modulator
Data in
SMA cable
174-1341-00
Optical cable
174-4727-00
Optical cable
174-4664-00
2X attenuator
(only used for
0.25 V tests in
Eye Pattern
Matrix)
Laser out
(FC/APC)
Optical input
(FC/PC)
Figure 14: Setup for the RMS Jitter test
RMS Jitter