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
Battery loading and unloading mechanism
System for controlled release of an active principle and method for preparation
Synchronization of communication equipment
Methods and apparatus for performing multiple photoresist layer development and etching processes
Down-drawable, chemically strengthened glass for cover plate
Method and apparatus for sensing an input object relative to a sensing region of an ultrasound sensor device
  Randomly Featured Patents
Business process and apparatus for online purchases using a rule-based transferable shopping basket
Portion of an appliance
Gain control method and electronic apparatus capable of gain control
Energy absorbers and methods of manufacture
Identity verification system
Drive chain for accumulation conveyor
Ceramic lotion pump
Flex suspension assembly for disk drive
Rolling bearing unit with rotating speed detector
Cooling drum for twin-drum continuous casting machine