5-26
IM AQ6370D-01EN
Explanation
Conditions under Which “UNCAL” Is Displayed
“UNCAL” is displayed when a single or repeat sweep is started based on the following
relationship between span, setting resolution, and set number of samples:
When the resolution correction function is turned OFF
x 5 > Set number of samples –
When the resolution correction function is turned ON
x 10 > Set number of samples –
Waveforms with Resolutions of 0.020 nm
When the resolution is set to 0.020 nm for measurements of a light source such as a
DFB laser in which with the spectral width is narrower than the instrument’s resolution,
very small spikes may occur at the skirts of the waveform. This type of spike occurs due
to characteristics of the optical block and is not an indication of any problem. Even if such
spikes occur, satisfactory performance in terms of resolution, dynamic range, and the like
can be ensured. These spikes will disappear if the resolution is set to a coarser value.
Ripples in the 1350 to 1450 nm Area
Water (OH-) ions present in the monochromator absorb light in the 1350 to 1450 nm
area, resulting in ripples in the measurement waveform. Either set a coarser resolution or
use the monochromator in a lower-humidity environment to reduce the amount of ripples.
Correction Mode (in R02.01 or Later Firmware Versions)
There are two correction modes: MODE1 and MODE2.
MODE1: It is the resolution correction function in firmware versions earlier than
R02.01.
MODE2: It provides the improved close dynamic range over MODE1. It is effective
when the resolution is 0.1 nm or wider.
5.7 Wavelength (Frequency) Resolution Settings
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