Maximum Loss In Pdl Mode; Polarization Dependent Loss; Passband; Flatness - JDS Uniphase SWS15100 User Manual

minimum insertion loss is computed. The Mueller matrix is then used to find the insertion loss for
this polarization state.
The minimum insertion loss shown is the minimum that is possible for the device at the stated
wavelength, without respect to the polarization state.

Maximum Loss in PDL Mode

In PDL mode, the maximum insertion loss is computed at each wavelength, without respect to
the polarization. To compute this, the Mueller matrix is computed from the insertion loss
measurement at the four linearly independent polarization states produced by the four-state
polarization controller. From the Mueller matrix, the polarization vector that produces the
maximum insertion loss is computed. The Mueller matrix is then used to find the insertion loss
for this polarization state.
The maximum insertion loss shown is the maximum that is possible for the device at the stated
wavelength, without respect to the polarization state.
Any insertion loss measurement made on the device must fall within the minimum and
maximum envelopes, as defined.

Polarization Dependent Loss

The PDL of a device is the positive difference between the maximum and minimum insertion
losses, in linear power scale. The loss is converted to dB and displayed as a function of
wavelength.

Passband

The passband of a device is the bandwidth calculated at a specified threshold, relative to the
center wavelength of the device, the ITU center wavelength, or the center wavelength of a
predefined custom channel. This wavelength is referred to as the reference wavelength. The
power at the specified threshold is found relative to the reference wavelength and the bandwidth
is computed at this power level.

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.

Crosstalk

Crosstalk (Left Crosstalk or Right Crosstalk) is the difference between the minimum power
within the reference passband and the maximum power in the adjacent (left or right) channel.

Cumulative Crosstalk (TXT)

Cumulative, or total, crosstalk is the difference between the minimum power within a passband
around the reference channel, and the sum of the peak powers at all the other channels.
224 – Reference
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