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
Computer network running a distributed application
Platform for generating electricity from flowing fluid using generally prolate turbine
Precision geolocation of moving or fixed transmitters using multiple observers
Ultrathin fluid-absorbent cores
Apparatus and method for information display of portable device
Discharge lamp lighting circuit
Login security with short messaging
  Randomly Featured Patents
Stress-controlled dielectric integrated circuit
Halo-functional silane, process for its preparation, rubber composition containing same and articles manufactured therefrom
Substituted benzenesulfonic esters and their use as medicaments for combatting helminths
Removal of sulfur from recycle gas streams in catalytic reforming
Storage cabinet
Multi-channel architecture with channel independent clock signals
Manufacturing method for dispenser code
Ceramic fiber thermal protection coating
Dispensing container
Environmental continuous air monitor inlet with combined preseparator and virtual impactor