Polarization to phase converter

Details Polarization to phase converter Polarization to phase converter

2002-04-10

2011-11-29

Sedighian, M. R. (Department: 2613)

Optical communications

Transmitter and receiver system

Including polarization

C398S188000, C380S256000

Reexamination Certificate

active

08068741

ABSTRACT:
The invention provides an apparatus and method for time delaying different polarization components of a signal relative to one another, comprising a polarization signal splitter which splits first and second polarization components of an input signal into a first component signal and a second component signal such that said first component signal propagates along a first path and the second component signal propagates along a second path, wherein said first component signal reaches a location relative to when said second component reaches said location at times differing by a delayed time, and use of the apparatus in a communication system. The apparatus may be used for quantum cryptography, to convert a sender's polarization-qubit signal into a signal appropriate for channels and receivers based on phase-encoded schemes.

REFERENCES:
patent: 5307410 (1994-04-01), Bennett
patent: 5953421 (1999-09-01), Townsend
patent: 6188768 (2001-02-01), Bethune et al.
patent: WO 97/44936 (1997-11-01), None
Chiianga et al, “Towards practical quantum cryptography,” Appl. Phys. B 69, 389-393 (1999).

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