Page 358 - Fiber Bragg Gratings
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7.3 Super-step-chirped gratings 335
Figure 7.20: The reflectivity and group delay difference of a 500-mm-long
SSCG with random stitching errors, shown as a fraction of the Bragg wavelength.
the cumulative effects of each join. However, as has been reported, these
gratings may still be useful for dispersion compensation at 10 Gb/sec [48].
In Fig. 7.21 is shown the measured reflectivity and relative group
delay characteristics of a 400-mm-long SSCG made in four sections with
random stitching errors. We note that the characteristics of the relative
group delay are better than the simulation suggests. This is probably due
to small random variations in the chirp of each grating section.
Figure 7.21: The measured characteristics of a 400-mm-long SSCG with a
chirped bandwidth of ~3 nm and random stitching errors. Compare with Fig.
7.20.
