38
Appendix III: Ethernet Configuration
Figure 19: Ethernet Configuration
After connecting the ML-DSO to the PC through the USB cable, run the
DSO Conf
software. Read
the current IP address by pressing the “R”
button. Note that the device has a default IP address:
172.16.115.155; it can be changed to fit the network.
Press “W” to save
the new address. The mask and gateway configurations can be changed in order
to fit the network.
Double click inside the bottom white box in order re-establish the connection.
Appendix IV: SIRC Calibration Methods
A correctly implemented SIRC filter yields a 4
th
-Order Bessel Thompson roll-off response as
outlined by the IEEE802.3bs/cd publications. ORR, the Optical Reference Receiver filter, is
specified by selecting a certain frequency cutoff percentage of the bitrate, see the following
examples:
•
75% of 25 Gbaud for legacy NRZ signals
•
50% of 26 Gbaud and 53 Gbaud for PAM TDECQ measurements of single-mode signals
•
75% of 26 Gbaud and 53 Gbaud for OMA measurements of single-mode signals
•
42% of 26 Gbaud for measurements of multi-mode signals
Method 1: Factory Calibration
SIRC Calibration is conducted at an ML premises with a femtosecond pulse laser. Using a 100
MHz rep rate, a pulse is sent from a high-
end laser to each of our O/E’s. We capture the
electrical time domain pulse data from the O/E at different gain levels that are relevant to the
application; following this the pulse is processed into the frequency domain. A filter file for
each gain level is then generated, and these files are shipped to the end user along with the
DSO platform.
