Resources Contact Us Home
Optical amplifier for use in optical communications equipment

Image Number 15 for United States Patent #6373623.

The output level of pumping light supplied from a pumping light source is varied using a variable attenuator, which is controlled by a variable attenuator driver circuit. By separating a portion containing the pumping light source from a portion containing an amplification medium, it becomes possible to prevent heat emitted by the pumping light source from adversely affecting the amplification medium. By arranging the portion containing the pumping light source such that a pumping light source or sources can be added when necessary, optical transmission system requirements of having more pumping light sources for system upgrade can be accommodated readily. By packaging portions containing amplification media, an optical amplifier can be made small.

  Recently Added Patents
Relative pose estimation of non-overlapping cameras using the motion of subjects in the camera fields of view
System and method for providing radio communication in a land mobile radio system
Method for resource allocation in a wireless communication network, method for error-free transmission of information, node and wireless communication network
Accessory sleeve
Polyurethane resin, toner for developing electrostatic charge image, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method
Method for implementing dynamic pseudorandom keyboard remapping
Electric discharge machining hole drilling
  Randomly Featured Patents
Imaging element comprising an electrically-conductive layer containing metal antimonate and non-conductive metal-containing colloidal particles and a transparent magnetic recording layer
Piston-type compressor with piston guide
Reverse osmosis support substrate and method for its manufacture
Piezoresistive pressure sensor
Apparatus for transferring and changing the direction of transport of rod-shaped articles
Bolt connection to connect a hollow profiled member to a profiled member disposed transverse thereto
Disengageable coupling
Sleeping bag with clasp for facilitating rolling
Supplying draught beverages
Laser welding method