User`s guide

Specifications Definition of Terms
28 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition
Return loss
The ratio of the incident power to the reflected power expressed in dB.
Symbol: RL.
Conditions: the return loss excludes any reflections from the fiber end
used as radiation source.
Spectral width of optical source
Full width at half maximum. The 3 dB width of the optical spectrum,
expressed in nm. Symbol: FWHM.
Tot al uncertainty
The uncertainty for a specified set of operating conditions, including noise
and drift.
Conditions: power level, beam diameter or fiber type, numerical aperture,
wavelength, spectral width, ambient temperature, re-calibration period as
specified. →Noise and drift observed over a specified observation time,
with a temperature change of not more than ±∆T.
Uncertainty at reference conditions
The uncertainty for the specified set of reference conditions, including all
uncertainties in the calibration chain from the national laboratory to the
test meter.
RL 10
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