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
High-density 3-dimensional structure
In-store marketing sign
Systems and methods to provide communication history for communication devices
Semiconductor device
Computerized apparatus for identifying industries for potential transfer of a job function
Input system including position-detecting device
Hydroxylated amide skin moisturizer
  Randomly Featured Patents
Parking barrier
Superabsorbent materials and uses thereof
Reactant product valve for an electrolysis cell
Pneumatic spring-vibration damper assembly
Photopolymerizable compositions with binders containing carboxyl groups
Mounting assembly
Method for manufacturing intermediate products for preparation of animal feeds
Monobloc cooling device component
Image formation method having translucent particles containing a coloring agent and a colorless dye former
Perpendicular recording medium and magnetic recording apparatus