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
Efficient forward ranking in a search engine
Image processing apparatus, image forming system, and computer-readable storage medium
System and method for infrared dongle
System and method for redundant array copy removal in a pointer-free language
Driver circuit for driving semiconductor switches
Surfcraft fin
Pausing multimedia data streams
  Randomly Featured Patents
Tape cassette with erasure preventing plug having a head portion with a slanted bottom surface
Through-hull instrument mounting bracket
Liquid crystal display with one of subpixel electrodes being offset with respect to other
Automatic sewing machine exclusively used for sewing zipper on workpiece
Recovery from clipping events in a class D amplifier
Magnetic refrigerator
High density electronic packages
Semiconductor device and manufacturing method thereof
Methods of making HIV-protease inhibitors and intermediates for making HIV-protease inhibitors
Thermus thermophilus nucleic acid polymerases