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
Method for the synthesis of an array of metal nanowire capable of supporting localized plasmon resonances and photonic device comprising said array
Multiplanar image displays and media formatted to provide 3D imagery without 3D glasses
Focusing apparatus that effectively sets a focus area of an image when a focusing mode is changed
Socket type MEMS device with stand-off portion
Information processing apparatus, method for controlling information processing apparatus, and storage medium
Clusterin antisense therapy for treatment of cancer
Monitoring agent programs in a distributed computing platform
  Randomly Featured Patents
Separation and extraction of bitumen from tar sands
Network design processing device and method, and program therefor
Monitoring of downhole parameters and tools utilizing fiber optics
Mixing valve
Mems mirror array and controls
Method and apparatus for switching back a change-pole motor
Signal processor for infrared camera
Test for lupus anticoagulant
Methods and devices for separating particles in a liquid flow
Method for making freeze dried drug dosage forms