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
ASICs having programmable bypass of design faults
Computer system for routing package deliveries
Image forming apparatus, control method and computer-readable medium for stopping a print job during printing by a printer
Protective circuit board and battery pack using the same
Online data conversion technique using a sliding window
Correcting color plate data for mis-registration in a sub-scanning direction by performing a pixel transition at the transition point aligned in the main-scanning direction
Distylium plant named `PIIDIST-II`
  Randomly Featured Patents
Optical disc system including current monitoring circuit assembly having controller with improved optics module and laser driver and method for operating same
Pull-out guide for drawer
Method for measuring binding of a test compound to a G-protein coupled receptor
Methods of producing GABA
System and method for adaptively modifying base station transceiver resources for time of arrival measurements
System and method for accident logging in an automated machine
Corrosion resistant wire-grid polarizer and method of fabrication
Dioxane removal from ether sulfate
Process of making instant pasta with improved cooking quality
Computer keyboard