Agilent Technologies 86038A User Manual page 64

Making Measurements Setup Parameters and What They Do
IF Bandwidth
This control sets the bandwidth of noise-reducing filter circuitry and
algorithms in the RF network analyzer. A lower value of IF Bandwidth
provides better noise rejection but also increases measurement time. For
the same impact on measurement time, reducing IF bandwidth is more
effective in suppressing noise than increasing the samples/point.
TLS Power
This control sets the TLS output power. The default value of –5 dBm is
available from the 81600B tunable laser sources over the full operating
wavelength range. For the 81600B-160 tunable laser source a power level
of +5 dBm is available from 1520 nm to 1610 nm. For other tunable laser
sources refer to the individual TLS specification. At higher TLS power
levels, Amplitude Dynamic Range and Group Delay Noise is improved, but
phase dynamic accuracy (PDA) effects are more pronounced. After
changing the TLS power, normalization (without PDA) is required.
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Agilent 86038A Optical Dispersion Analyzer, Third Edition