About: http://webisa.webdatacommons.org/147219672

Property	Value
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	This is accomplished using a passive device such as a Bragg fiber grating and a circulator or by using an active optical delay line such as a fiber stretcher or adjustable free space optical path element.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au