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2
Figure 2-12. Setting the Output P ower of a Coherence Controlled Signal
Press 4
OUTPUT POWER
5 ,
NNNNNNNNNNNNNNNNNNNN
Mod/CW , and
NNNNNNNNNNNNNNNNNNNNNNN
CohCtrl as necessary to get to this
display .
See \Changing the V alue of a P arameter" in Chapter 1 if you need details on
how to edit parameters .
Y ou can change the units by pressing
NNNNNNNNNNNNNNNNN
W/dBm .
The notes above about excessive power , and the analog output apply also to the
power of a coherence controlled signal.
The Coherence Control Uncal P ower
At any particular wavelength, coherence control is only available with the
specied linewidth, above a level known as the Coherence Control Uncalibrated
P ower , and below the Maximum P ower level (that is , in the area between the
two curves in the diagram). The message CC UNCAL indicates that the laser
power is not high enough to provide the specied linewidth. The linewidth is
still broadened.
Figure 2-13.
The Coherence Control Uncalibrated P ower and the Maximum P ower Level
2-14 Setting Wavelength and P ower