DCR-AFR Spectrometer Comparison

**Figure 9:** Comparison of Spectrometer gain ratios with DCR AFR gain ratios for data coming down Optical Driver 2. The DCR results with $3\sigma$ errors are shown as the black data points. Each colored line represents a different set of attenuation levels (see Table ) used to determine the gain ratios. The DCR result should be compared with an average over frequency of the spectrometer results.
$\includegraphics[width=4.25in, angle=-90]{OD2-X-Bank1.ps}$ $\includegraphics[width=4.25in, angle=-90]{OD2-X-Bank2.ps}$

**Figure 10:** Comparison of Spectrometer gain ratios with DCR AFR gain ratios for data coming down Optical Driver 4. The DCR results with $3\sigma$ errors are shown as the black data points. Each colored line represents a different set of attenuation levels (see Table ) used to determine the gain ratios. The DCR result should be compared with an average over frequency of the spectrometer results.
$\includegraphics[width=4.25in, angle=-90]{OD4-Y-Bank1.ps}$ $\includegraphics[width=4.25in, angle=-90]{OD4-Y-Bank2.ps}$

**Figure 11:** Comparison of Spectrometer gain ratios with DCR AFR gain ratios for data coming down Optical Driver 6. The DCR results with $3\sigma$ errors are shown as the black data points. Each colored line represents a different set of attenuation levels (see Table ) used to determine the gain ratios. The DCR result should be compared with an average over frequency of the spectrometer results.
$\includegraphics[width=4.25in, angle=-90]{OD6-X-Bank3.ps}$ $\includegraphics[width=4.25in, angle=-90]{OD6-X-Bank4.ps}$

**Figure 12:** Comparison of Spectrometer gain ratios with DCR AFR gain ratios for data coming down Optical Driver 8. The DCR results with $3\sigma$ errors are shown as the black data points. Each colored line represents a different set of attenuation levels (see Table ) used to determine the gain ratios. The DCR result should be compared with an average over frequency of the spectrometer results.
$\includegraphics[width=4.25in, angle=-90]{OD8-Y-Bank3.ps}$ $\includegraphics[width=4.25in, angle=-90]{OD8-Y-Bank4.ps}$

In order to check that the non-linearities were not occurring in the DCR only, we ran the spectrometer at the same time that we took data with the DCR signals coming from the Analog Filter Rack. In Figures 9, 10, 11, and 12 we plot the gain ratio measured in the spectrometer versus the gain ratio found in the DCR. Recall that the DCR values should be considered averages over frequency of the spectrometer results. We see that the spectrometer gain ratios agree extremely well with the DCR gain ratios. The spectral response of the non-linearities is flat for all but the highest input powers. It thus appears that the DCR is not responsible for the observed non-linearities.