About: http://webisa.webdatacommons.org/427276524

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	An optical fiber amplifier is comprised of Er-doped (rare earth added) fibers, a wavelength-division multiplexer (WDM), a pumping diode laser, a polarization-independent isolator, and other passive components.
http://www.w3.org/ns/prov#wasQuotedFrom	fdk.co.jp