JDS Uniphase SWS15100, Руководство пользователя

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Terms – 3
Definitions
Analysis tab page Where the user selects what type of analysis results are to be shown,
and for which channels.
Bandwidth The spectral width of a signal or filter. The bandwidth is defined as the
width (in wavelength) of the peak of a beam measured at a specified
threshold. The threshold is a power level below the maximum for a
beam with a maximum peak or a power level below the average
baseline, if the peak is a minimum.
Center wavelength The interpolated wavelength marking the center of the peak measured
at any threshold.
Channel In SWS documents, channels refer to physical detectors. The upper
detector on each detector module is an odd-numbered channel, while
the lower detector is an even-numbered channel. In communications,
the word “channel” is more specific to ITU channels, which are
defined wavelength regions. Refer to ITU channels in full as “ITU
channels” to avoid confusing the two.
Chart area Where the data plots, Chart Resize button, and chart zooming control
buttons are located.
Common area The bottom left corner of the Main window where Channel Selection,
Start and Stop Acquisition, and Reference buttons are located.
Configuration area Contains the common area, status area, and tab pages.
Crosstalk
A value of Crosstalk describes the levels of the signal attributed to
leakage of optical power into undesired wavelength ranges and
compared to the performance of a DUT within its working region.
Custom or ITU, adjacent and non-adjacent channels with their
passbands, as well as discrete wavelengths (frequencies) can be
used to specify those undesired wavelength ranges.
Dark voltage The signal level obtained when blocking all light to the detector.
Flatness
The flatness of the device is a measure of the slope of a straight line
that is a best linear fit to the top of the trace in a given channel.
Flatness is calculated by finding the difference in power between the
two points where the line crosses the band edges. The user defines
whether to use passband, bandwidth, or some other numerical range.
Isolation Defined for a Channel A with respect to a second (physically isolated)
Channel B. It is the insertion loss of Channel A at the nearest guard
band of Channel B.
Marker A crosshair that moves along the channel data up and down in
wavelength.
Marker tab page The tab page where the user selects which markers are to be shown.
Minimum peak The absolute minimum found in the insertion loss trace over the whole
wavelength range.
Mueller matrix The special matrix used to compute PDL.
Pan Moves the image so that the last clicked position is brought to the
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