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

Image Number 5 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
Barrier layers comprising Ni-inclusive ternary alloys, coated articles including barrier layers, and methods of making the same
Toner cartridge and image forming apparatus including the same
Highly detectable pilot structure
System and method for providing radio communication in a land mobile radio system
Multi-band dipole antenna
Aluminum galvanic cell
Extensible, filtered lists for mobile device user interface
  Randomly Featured Patents
High output LED matrix color TV screen with vertical triad and tricolor faceplate
Fuel injection device for internal combustion engines
Vortex separator
Skin treating composition, method of producing the same and treatment of skin therewith
Bearing assembly with locking device
Printer, printer head, and method of producing the printer head
Conveyor frame with drive housing
Method of processing recording media and apparatus for processing recording media
Electric starter apparatus and method with multi-stage gearing for starting an internal combustion engine
Electromagnetic shielding device