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
Bootstrap gate driver
Stackable clothes drying apparatus
Correlating trace data streams
Interconnecting virtual domains
Cabinet door with tread pattern
Prevention and reduction of blood loss
Listing recommendation using generation of a user-specific query in a network-based commerce system
  Randomly Featured Patents
Article wrapping apparatus
Method and an apparatus for decoding an audio signal
Single channel M x N optical fiber switch
Production of tryptophan by microorganisms
System for assessing bone characteristics
Clamping construction for an automotive wiring harness
Optical coupling of light pipes
Golf green repair apparatus and method
Package with peel-off closure
Shutter link for a multi-link overhead shutter of roller blind