Resources Contact Us Home
Solution doping method of making an optical amplifying fiber

Image Number 7 for United States Patent #6408652.

An optical amplifying fiber including a clad, a first core provided inside the clad and containing Ge, a second core provided inside the first core and containing Er and Al, and a third core provided inside the second core and containing Ge. The second core has a refractive index higher than that of the clad, and the first and third cores have refractive indexes each of which is higher than that of the second core. Since the third core having the high refractive index is provided at a central portion, it is possible to make smaller a mode field diameter and hence to improve a conversion efficiency of pumping light into signal light. Further, since the second core contains Al as an amplification band width increasing element, it is possible to sufficiently ensure a wide amplification band width.

  Recently Added Patents
Washing machine
Coordinate locating method and apparatus
Wafer-level chip scale package
Vaccination with killed but metabolically active (KBMA) protozoans with toll-like receptor agonists
Plants and seeds of corn variety CV294874
Substituted phenylsulfur trifluoride and other like fluorinating agents
PCSK9 antagonists
  Randomly Featured Patents
PC-time desktop computer clock
Ring-shaped handheld showerhead
System and method for quality of service (QoS) setup of a network segment having an intermediate device
Optimized input/output memory access request system and method
L-lysine-producing corynebacteria and process for the preparation of L-lysine
Method of displaying a map
Printer with input and output trays
Safety needle
Coelioscopic angulation forceps
Helicopter landing gear assembly