Appendix D: Automatic receiver deskew
When setting up for the
fi
rst time or whenever the channel delays are completely
unknown, it is best to use the utility CalChDelay as shown in the
fi
gure at step 6.
To use this utility, do the following steps:
1.
Complete the initial setup.
2.
Launch the Laser Receiver Control Panel (LRCP) and connect to the
OM4000 instrument and use the drop-down menu to select the reference laser.
(See page 19,
The Laser Receiver Control Panel (LRCP) user interface
3.
Connect a high-baud rate BPSK signal to the Input of the OM4000 instrument.
4.
Tune the reference laser to the same WDM channel as the BPSK signal. Use
the oscilloscope controls to verify that the BPSK source is on and at proper
level. It does not have to be perfectly biased. Adjust the vertical gain on the
oscilloscope so that the signal is
fi
lling up at least 50% of the oscilloscope
screen. Adjust the signal polarization as needed to get good signal level on
all four oscilloscope inputs.
5.
Launch the OUI software and connect to the oscilloscope using the Setup tab.
Ensure that the proper LO Frequency is displayed on the Setup tab as well.
On the display tab select Single-pol BPSK and also select 1 Pol BPSK on the
Analysis Parameters tab. Enter the Clock Frequency of the BPSK signal.
6.
Enter the CalChDelay function in the MATLAB Engine Command window.
7.
Click
Single
to take an acquisition; be sure no errors are reported in the
MATLAB Engine Response.
8.
Use the sliders in the Calibrate tab to set the displayed ChDelay for future use
(only the last 3 numbers are set since the
fi
rst is always zero.
OM4000D Series Coherent Lightwave Signal Analyzer
121
Summary of Contents for OM4006D
Page 2: ......
Page 6: ......
Page 22: ...Compliance information xvi OM4000D Series Coherent Lightwave Signal Analyzer...
Page 24: ...Preface xviii OM4000D Series Coherent Lightwave Signal Analyzer...
Page 100: ...Taking measurements 76 OM4000D Series Coherent Lightwave Signal Analyzer...
Page 146: ...Appendix D Automatic receiver deskew 122 OM4000D Series Coherent Lightwave Signal Analyzer...
Page 202: ...Appendix H Cleaning and maintenance 178 OM4000D Series Coherent Lightwave Signal Analyzer...
Page 205: ...Index W Waveform averaging 48 OM4000D Series Coherent Lightwave Signal Analyzer 181...