References - Agilent Technologies N4373A User Manual

Introduction Specifications and Regulatory Information
System relative frequency response uncertainty When
calculating the difference of the measured Responsivity and
the actual responsivity in dBe over modulation frequency,
the system relative frequency response uncertainty is ± half
the peak- to- peak value, expressed in dBe.
Conditions: Measurement within a specified time after the
required calibration measurements.
Measurement: calibration with a NIST calibrated O/E
receiver.
Unmodulated output power (of LCA optical out) The optical power
at LCA optical out when the electrical (RF) input of the
optical test set is electrically terminated.
Wavelength (of LCA optical out) Peak wavelength of the signal
at LCA optical out. Wavelength is defined as wavelength in
vacuum.
Wavelength range (of LCA optical in) The wavelength range on
the LCA optical in where measurements can be performed.

References

(1)
according to the "Guide to the Expression of Uncertainty
in Measurement" ("GUM"), BIPM, IEC, ISO et al. (1993)
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Agilent N4373A Lightwave Component Analyzer, First Edition