Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Four level FSK optical signal transmission with optical decoding and direct detection










Image Number 3 for United States Patent #5105295.

Apparatus for optical transmission of first and second digital channels. Each digital channel has first and second signal levels. The appparatus has a tunable laser for emitting an optical output at optical frequencies corresponding to current levels. Current responsive to the signal levels of the two channels provides current levels to cause the laser to emit a first optical frequency when the first channel has a second signal level and the second channel has a second signal level, a second optical frequency when the first channel has a first signal level and the second channel has a second signal level, a third optical frequency when the first channel has a first signal level and the second channel has a first signal level, and a fourth optical frequency when the first channel has a second signal level and the second channel has a first signal level. An optical transmission medium is coupled to the output of the laser. A tunable optical filter is coupled to the optical transmission medium. The filter is tuned to pass a pair of adjacent optical frequencies corresponding to a signal level on a selected channel. A baseband detector at the output of the optical filter for provides a mark when either of the pair of optical frequencies passes through the optical filter. The mark is indicative of a signal level on the selected channel.








 
 
  Recently Added Patents
Flexible lighting devices
Closed cell culture system
Restore software with aggregated view of content databases
Semiconductor arrangement with a solder resist layer
Data output apparatus and data output method
Method for editing a media clip in a mobile terminal device, a terminal device utilizing the method and program means for implementing the method
Antibody recognizing turn structure in amyloid .beta.
  Randomly Featured Patents
Foundry compositions containing propylene glycol monoacetate
Additive for hair growing agent and hair growing agent composition
Multilayer capacitor
Router for daisy-chained components
Baculovirus-based expression system
Toy airplane
Table of botanical ingredients and method of preparing a table useful for blending combinations thereof
Manually operated ejector device for holding a cartridge
Blind cleaning device
Image forming apparatus and developer supplier capable of supplying developer at increased speed