MX10B, MX40B Series of Optical Transmitters
Chapter 4: Operating Instructions
Page 18
TTN048897-D02
4.4 Amplifier Settings Page
To get to the Amplifier Settings page, tap on the Amplifier monitor pane on the Home page. The Amplifier has a fixed gain that
it applies to a user input signal. The signal is then routed to the RF input port of the MZM via the front panel loop-back cable.
There are two Modes for the amplifier: 1) Digital and 2) Analog, but both work with the same fixed gain. Analog mode simply
sets the output swing of the amplifier to maximum.
Figure 29
Selecting between Analog and Digital Amplifier Settings
The default amplifier mode is Digital, in which case the output swing and crossing point can both be adjusted while the gain is
held constant. This digital mode is recommended for OOK (On-Off Keying) digital signals. The V
π
Swing button is provided to
conveniently set the Max Output Swing to the optimum value to achieve high extinction modulation with the internal modulator.
Figure 30
Digital Amplifier Mode Settings
The Max Output Swing field allows the user to set the peak-to-peak output voltage of the amplifier, assuming the amplifier input
signal is large enough to cause the amplifier to start clipping. The Max Output Swing essentially controls the output amplitude
at which the amplifier starts clipping. When operating in the digital mode, it is expected the user will supply a signal with sufficient
input amplitude to cause the amplifier to clip.
Tap here to change modes.
Select Analog mode to
provide maximum output
swing.
Select Digital mode to
enable adjustable
output swing.
Tap here to adjust crossing set
point from -100 to +100.
Tap here to optimize output
swing.
Tap here to adjust maximum
output swing in Digital mode.
