About: http://webisa.webdatacommons.org/247120878

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http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	By doing so, the period of the grating is changed in such a manner as to vary it along its length, thereby chirping the grating The authors of this prior art reference, Variable- spectral response optical waveguide Bragg gratin
http://www.w3.org/ns/prov#wasQuotedFrom	google.com