A long-band optical fiber amplifier with enhanced power conversion efficiency including a first optical fiber part provided with a pumping light source, a second optical fiber part connected with the first optical fiber part, the second optical fiber part being not provided with the pumping light source,...http://www.google.es/patents/US6222670?utm_source=gb-gplus-sharePatente US6222670 - Long-band optical fiber amplifier with enhanced power conversion efficiency
Long-band optical fiber amplifier with enhanced power conversion efficiency
