7-8
U
SER
M
ANUAL
750000992/16
Optical spectrum analyser
MTS
e
Grid display
The display window of the trace may contain a grid to facilitate the control of the
position of the channels. Several grid types are possible:
•
The
Conventional
grid has an interval (spacing) indicated in the top right
corner of the window, which varies according to the zoom level.
•
The
ITU
grid uses a channel reference at 193,10 THz and three steps are
possible for the spacing between the channels: 50, 100 or 200 GHz.
•
The
Manual
grid can be defined by the user to correspond exactly to the
channels. The position of the first vertical line must then be defined according
to the wavelength of the first channel, the spacing (from 50 to 400 GHz by 5
GHz steps) and the number of intervals desired.
The grids are defined in the OSA test setup menu (see "Results display
parameters" on page 7-4).
The grid may be put into service either in the OSA test setup menu, or on the
Results page, by pressing the <Expert> key then the <Grid> key.
Display of total power between cursors
To display the total power between the two cursors A and B on the trace:
•
Place the cursors.
•
Press the <Expert> key, then the <Manual> key, and finally the <T Power A<-
-->B> key.
•
The space between the trace and the two cursors is shadowed in grey and the
power is displayed using the «P = -4.95 dBm» format.
•
Press the <T power A<-->B> key a second time to remove the total power
measurement result.
Display of Gain Tilt (delta) and Gain Slope results
The MTS
e
allows for the display of two additional results:
•
The Gain Tilt, that is to say the difference between the max. and min. peak
values of the whole spectrum of the signal between the cursors.
•
The Gain Slope measured by the least squares method, using a linear
regression algorithm.
To display the results above the channels:
•
In the OSA test setup menu, verify that the «Tilt & Slope gain» parameter is
set on «Yes».
•
Place the cursors
•
Press the <Expert> key, the <Manual> key and finally the <Tilt & Slope> key.
The Gain Tilt is displayed in dB. The Gain Slope is traced and the value is
displayed in dB/THz or dB/nm depending on the chosen unit.
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