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22 February 2012All-optical signal processing using planar Bragg gratings
All-optical signal processing offers the prospect of realizing high sampling bandwidth and overcoming many of the
limitations of electronics. This work introduces the use of planar Bragg gratings in all-optical signal processing. The key
fabrication technique is direct grating writing (DGW). One significant advantage of the DGW system is the small spot
size of the focused laser beam used to inscribe the waveguide and grating. Rather than using the wide area exposure such
as that from a phase mask, DGW uses a direct UV laser spot such that the dimensions of the UV induced structure are
determined by the focal spot size. For complex grating engineering this feature is superior to the conventional phase
mask techniques, allowing accurate control of the chirp, phase shifts, apodisation and other parameters to produce
intricate optical response.
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C. Sima, J. C. Gates, H. L. Rogers, B. D. Snow, C. Holmes, M. N. Zervas, P. G. R. Smith, "All-optical signal processing using planar Bragg gratings," Proc. SPIE 8333, Photonics and Optoelectronics Meetings (POEM) 2011: Optoelectronic Devices and Integration, 833309 (22 February 2012); https://doi.org/10.1117/12.919071