Measurements at 351 nm of temporal dispersion in fibers Page: 10 of 26
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The streak in Fig. 9 was recorded at only 800 counts, but it is not spatially uniform.
The FWHM is much greater at the center than in the left skirt.
We defined the width of the fiber-path streaks to be the average four values of
FWHM that had been measured from columns with differing counts. Figure 7
contains the FWHMs that were measured for the July 31 data set. Here the situation
is exactly the reverse of that for air-path streaks. For spatially symmetric fiber-path
streaks, the assigned values of FWHM varied significantly with counts, but
uncertainties in individual values did not. At present, there is not an explanation
for the behavior of the fiber-path streaks.
.I I I
s8080628 43 38
o 400 29
0 5 10 15 20
Fig. 9. Example of a streak that was not spatially symmetric.
For an individual FWHM, the assigned uncertainty is the full range of the
four values of FWHM that were averaged. In some cases, this range was less than
the 1-ps precision of the experiment.
For an individual value of dispersion, the assigned uncertainty is the full
range that is allowed by the assigned uncertainties in the particular pair of FWHMs.
The dominant contribution to the uncertainty in dispersion was the dependence of
the FWHM of the fiber-path streak on camera counts.
IV. Tests of a 35-meter bundle and a companion 35-meter single fiber.
We tested a 35-m bundle that contained 19 each 50- m-core fibers, and
companion 35-m length of the fiber. SMA connectors were mounted on both ends
of the bundle and the fiber. The lengths of the fibers in the bundle were measured
by mechanical rather than optical means. This was done as part of the bundle
development effort to reduce projected bundle fabrication costs.
IV. A. Results for the 35-m single fiber.
The fiber-path streaks were spatially symmetric, and they were recorded with
only slight variation in counts, 550 to 830. The air-path streaks were recorded at 490
to 1640 counts. Expanded images of one air-path and one fiber-path streak are
shown in Fig. 10. The measured values of FWHM are shown in Fig. 11. With a
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Griffith, R; Milam, D; Sell, W & Thompson, C. Measurements at 351 nm of temporal dispersion in fibers, report, November 4, 1998; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc738822/m1/10/: accessed June 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.