Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Sagnac interferometer based secure communication system










Image Number 15 for United States Patent #5311592.

A secure fiber optic communication system capable of tens of gigabits/second data transfer rates that utilizes a pair of single mode fiber optic cables in combination with one or more light sources, phase modulators, detectors and polarization scrambling elements to form a Sagnac interferometer. The phase modulator is driven so that counter propagating light beams in the Sagnac loop experience a different optical path as they pass through the loop. When the two beams are recombined on the central beamsplitter of the Sagnac loop, the two beams interfere with each other and the data impressed as phase modulation on the light beams by the phase modulator is recovered as amplitude modulation on the output detector of the Sagnac interferometer. The system can be configured to operate full duplex on two optical fibers by using light at different wavelengths or time division multiplexing data. The system can also be configured as a multi-node network. Alarms, intrusion control, random pathlength changes and the like can be included to make undetected, unauthorized access to the system even more difficult.








 
 
  Recently Added Patents
Brushless motor drive apparatus and drive method
System and method for identifying a target signal in an optical transport network frame structure
Plasma doping method and plasma doping apparatus
Terminal for flat test probe
Electric power supply system and electric power supply system for motor vehicle
Fixing device, fixing device control method, and image forming apparatus
Compound semiconductor epitaxial structure and method for fabricating the same
  Randomly Featured Patents
Method of treating bladder cancer with wild type vaccinia virus
Branched amides of L-aspartyl-D-amino acid dipeptides
Label printer system
System and method for regulating loading on an integrated circuit power supply
System to control effective series resistance of power delivery circuit
Pressure pad engagement mechanism using sliding actuator
Method and system for determining the velocity of an automobile
Non-linear temperature compensating device for fiber gratings and a package therefor
Turbine fluid flow resistor
Process for the single-stage preparation of glycosyl fluorides