Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Polarization direction synchronization detecting circuit and receiving apparatus










Image Number 7 for United States Patent #8131160.

A switch is to be inputted a modulation signal including the synchronization signal extracted from a received communication signal as a control signal, is to be inputted a detection signal detected by a photodetector that receives a polarization modulation signal adjusted to a polarization direction of a quantum cipher signal, and selectively switches and outputs one of the detection signal and an inverted signal of the detection signal according to the control signal. A low-pass filter outputs the output signal of the switch, whereby a plus level signal is outputted when a relative angle difference .DELTA..theta. between polarization axes on a transmission side and a reception side is larger than a predetermined polarization angle, a 0 level signal is outputted when .DELTA..theta. is equal to the predetermined polarization angle, and a minus level signal is outputted when .DELTA..theta. is in a range of the predetermined polarization angle from 0 degree.








 
 
  Recently Added Patents
Compositions of PD-1 antagonists and methods of use
Dot templates for object detection in images
Accessory sleeve
Method of manufacturing toner
Sensor chip, sensor cartridge, and analysis apparatus
Digital fine delay processing
Anti-slip strip for vehicle running boards
  Randomly Featured Patents
Tread for a light truck or automobile tire
Surveyor reel housing
Nucleic acid and amino acid sequences relating to Staphylococcus epidermidis for diagnostics and therapeutics
Semiconductor device and method for fabricating the same
Magnetic random access memory array divided into a plurality of memory banks
Multiband planar antenna
Raised image plate construction with regions of varying stiffness in the image areas
Fixing structures and supporting structures of ceramic susceptors, and supporting members thereof
Water-base ink composition and process for producing the same
Optimal storage mechanism for persistent objects in DBMS