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
Air driven alternators for battery powered vehicles
Frequency offset estimation apparatus and method of OFDM system
Image-capturing device and projection automatic calibration method of projection device
Method of transmitting data using spatial multiplexing
Semiconductor device
Nutritional supplement method
  Randomly Featured Patents
Information processing apparatus and method of controlling authentication process
Refrigerator with moisture adsorbing device
Dual coupled vehicle glass mount antenna system
Breakaway utility pedestal with programmable internal metering for marine and recreational vehicles
Phase lock loop control system and method with non-consecutive feedback divide values
System and method for ensuring call privacy in a shared telephone environment
Photoacid generator systems for short wavelength imaging
Classification device, vertical pulverizing apparatus using the same, and coal fired boiler apparatus
Element recognition and orientation
Silylated bisphenol