THORLABS MX10C Series User Manual page 17

MX10C, MX40C Series of Optical Transmitters
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.
The Crossing Point field allows the user to adjust the eye crossing point in the eye diagram as depicted in the diagram below. It
provides an adjustment to optimize the bit-error-rate (BER) performance of a transmission link by adjusting the amplifier's internal
threshold levels. If the phase modulation is converted to intensity modulation, then the effect of crossing point adjustments would
be as shown on the graphic below.
Rev. F, February 21, 2020
Figure 17 Digital Amplifier Mode Settings
Figure 18 Illustration of Different Crossing Point Settings
Chapter 4: Operating Instructions
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.
Eye crossings as a function of
the crossing set-point.
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