Resources Contact Us Home
Semiconductor optical amplifier suitable for coarse WDM communications and light amplification method

Image Number 17 for United States Patent #7167301.

An active layer contains quantum structures. The active layer amplifies light propagating therein while current is injected therein. Electrodes are provided for sections of the active layer sectionalized along a light propagation direction. The electrodes inject different currents into the sections. Current is supplied to the electrodes in such a manner that a first current density is set to one section of the active layer and a second current density is set to another section. The first current density is lower than that at a cross point and the second current density is higher than that at the cross point. The cross point is a cross point between gain coefficient curves at least two different transition wavelengths of the quantum structures. The curves are drawn in a graph showing a relation between a density of current injected into the active layer and a gain coefficient of the active layer.

  Recently Added Patents
Pre and post-paid real time billing convergence system
Temporary protective cover for an exposed junction box
Organic elelectroluminescent display
Superconducting magnetizer
Phone messaging using audio streams
Optical interconnect in high-speed memory systems
Gas flow indicator
  Randomly Featured Patents
Self-aligning manual die set for pressing explosive powder into pellets
Erythropoietin-mediated neurogenesis
Method and apparatus for testing a ring of non-scan latches with logic built-in self-test
Method of joining a metal connection tab to an electro-chemical cell electrode having a foam-type support, and an electrode obtained by the method
Reluctance force brake device
Wristband, comprising two straps in which one strap passes through an opening of the other strap
Semiconductor device having heterojunction type MIS transistor which can operate at reduced voltage while maintaining high operation speed
Vehicle decor
Multiplexing video decoding apparatus and method
Crystallized glass-bonded amorphous metal magnetic film-non-magnetic substrate magnetic head