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
Victim port-based design for test area overhead reduction in multiport latch-based memories
Wrench head
Method of manufacturing acrylic film, and acrylic film
Newly identified human rhinovirus of HRV-C and methods and kits for detecting HRV-Cs
Range extension techniques for a wireless local area network
Integrated circuit package system with bonding lands
System for setting programmable parameters for an implantable hypertension treatment device
  Randomly Featured Patents
Locking mechanism for antenna of electronic apparatus
System for automatically controlling the idling speed of an internal combustion engine
Systems and process for energizing loads through a control unit
Multipurpose whipped dessert and method of manufacturing
Pressure developing device in image recording apparatus
Top and side surfaces of a golf putter head
Sealing member and siding boards attachment structure
Methods of providing man-made islands
Method of fabricating non-volatile semiconductor memory device
Biocidal composition