Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Optical scanner and image-forming device
Method of generating integrated circuit model
Optoelectronic semiconductor chip comprising a reflective layer
Predicting performance of an integrated circuit
Means to securely fixate pacing leads and/or sensors in vessels
Systems and methods for velocity profile based approach to point control
Secure data exchange between data processing systems
  Randomly Featured Patents
In situ thermal processing of a coal formation using repeating triangular patterns of heat sources
Sheet-type vibrator and acoustic apparatus
Tape cassette rewinding machine
Scale and/or corrosion inhibiting composition
Sorting machine
Inflator assembly having partitioning member redirecting gas flow
Snowmobile hood attachment system
Plastic container
Adsorption of carbon monoxide using silver zeolites
Hydraulic control device for an automatic transmission