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
Check weigher comprising of a rotating weighing chute with an accumulating and a discharge position that calculates flow rate by measuring weight accumulated during a predetermined time interv
Electro-optical device, method of manufacturing the same, and electronic apparatus
DL control channel structure enhancement
System and method for interactive image-based modeling of curved surfaces using single-view and multi-view feature curves
Circuit device for preventing radiation emission in portable terminal with two cameras
Battery loading and unloading mechanism
  Randomly Featured Patents
Photoelectric encoder having a plane mirror disposed parallel to the optical axis of a concave mirror
Methods and compositions for the modulation of cell proliferation and wound healing
Collar for a small animal
Oil drain bag
Method and apparatus for communicating securely with a token
LbL-coated medical device and method for making the same
Permanent magnet direct current motor
Read only data bus and write only data bus forming in different layer metals
Shower head
Wireless communication unit, integrated circuit comprising a voltage controlled oscillator and method of operation therefor