About: http://webisa.webdatacommons.org/355635578

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	Recently, many types of optical switches formed of various directional couplers have been proposed.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com