Resources Contact Us Home
Switched bias scheme for high speed laser transmitter

Image Number 2 for United States Patent #4558465.

In a system for transmitting two level data bursts on a fiber optic (FO) bus, a circuit for turning on a light emitting diode to an excitation level induced by a current I.sub.B corresponding to the knee of the diode characteristic curve and increasing the emitted light in response to a second increasing excitation current over a second portion of the curve beyond the knee extending from excitation level I.sub.B to excitation level I.sub.M. The circuit includes first logic for exciting the diode by the first current, a light responsive device for determining when the emitted light reaches the intensity represented by the knee of the curve and induced by I.sub.B, and logic for reproducibly storing I.sub.B. Second logic responds to the excitation of the diode to the knee of its curve to further excite the diode with the second excitation current until the diode emits a desired light intensity induced by I.sub.B +I.sub.M. Logic is provided for reproducibly storing a signal I.sub.M. Switching logic supplies the current I.sub.M to the diode in response to the data bursts and supplies I.sub. B to the diode substantially concurrently with the data bursts. In the absence of the data bursts the current level I.sub.B is reduced to substantially zero.

  Recently Added Patents
Network based technique for obtaining operator identifier for mobile devices
Multilevel directory assistance apparatus and method
Methods for selective reverse mask planarization and interconnect structures formed thereby
Systems and methods for restoring images
Variety corn line NPAA2675
Transmitting a synchronizing signal in a packet network
Method and system for detecting data modification within computing device
  Randomly Featured Patents
Arc flash detection apparatus and electrical system including the same
Method and system for copying DMA with separate strides by a modulo-n counter
Ink jet printer having multiple ink heads
Drive bracket with locking devices
Slitting apparatus for sugarcane rind
Sequential scanning converter with frame comb filter and freeze frame feature
Sulfonated silicones and methods for their production
Strut for a wheel suspension of motor vehicles
Electronic camera, information device and portable information apparatus
Integrated metrology systems and information and control apparatus for interaction with integrated metrology system