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Great circle solution to polarization-based quantum communication (QC) in optical fiber

United States Patent

March 15, 2016
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
Birefringence in optical fibers is compensated by applying polarization modulation at a receiver. Polarization modulation is applied so that a transmitted optical signal has states of polarization (SOPs) that are equally spaced on the Poincare sphere. Fiber birefringence encountered in propagation between a transmitter and a receiver rotates the great circle on the Poincare sphere that represents the polarization bases used for modulation. By adjusting received polarizations, polarization components of the received optical signal can be directed to corresponding detectors for decoding, regardless of the magnitude and orientation of the fiber birefringence. A transmitter can be configured to transmit in conjugate polarization bases whose SOPs can be represented as equidistant points on a great circle so that the received SOPs are mapped to equidistant points on a great circle and routed to corresponding detectors.
Nordholt; Jane Elizabeth (Los Alamos, NM), Peterson; Charles Glen (Los Alamos, NM), Newell; Raymond Thorson (Santa Fe, NM), Hughes; Richard John (Los Alamos, NM)
13/ 600,898
August 31, 2012
ACKNOWLEDGMENT OF GOVERNMENT SUPPORT This invention was made with government support under Contract No. DE-AC52-06NA25396 awarded by the U.S. Department of Energy. The government has certain rights in the invention.