Optical communications – Transmitter and receiver system – Including compensation
Reexamination Certificate
2005-03-04
2008-11-25
Singh, Dalzid (Department: 2613)
Optical communications
Transmitter and receiver system
Including compensation
C398S152000, C398S184000, C380S255000
Reexamination Certificate
active
07457548
ABSTRACT:
A squeezed light generator comprises an arbitrary optical fiber, a means for temporally separating two linearly polarized components, two Faraday rotators and a high-reflection mirror. Pulse lights that are temporally separated into two orthogonally polarized components at an intensity ratio of 50:50 are reciprocatively propagated in the optical fiber, and the polarized light is rotated by 90° in an outward transmission. Since those two polarized components pass through the optical paths which are accurately equal to each other in the outward and homeward transmissions, those two polarized components interfere with each other accurately at 50:50 after reciprocation through the fiber. The interfered beam is separated by a polarizing beam splitter that is high in an extinction ratio. When the polarized lights before inputting the fiber and after reciprocating coincide with each other, it is unnecessary to maintain the polarization in the fiber propagation, and an arbitrary fiber can be used.
REFERENCES:
patent: 5966224 (1999-10-01), Hughes et al.
patent: 6188768 (2001-02-01), Bethune et al.
patent: 7046366 (2006-05-01), Ozeki et al.
patent: 7305091 (2007-12-01), Hirano
patent: 2004/0100637 (2004-05-01), Teich et al.
patent: 2004/0258421 (2004-12-01), Conti et al.
patent: 2006/0263096 (2006-11-01), Dinu et al.
patent: 2006/0290941 (2006-12-01), Kesler et al.
patent: 05-034739 (1991-08-01), None
patent: 2002-214654 (2001-01-01), None
S.Schiller et al. “Quantum Statistics of the Squeezed Vacuum by Measurement of the Density Matrix in the No. State Representation” by physical review letters Sep. 30, 1996.
Richart E et al. “Squeezed light for Coherent Communication” by journal of lightwave technology vol. 8, Mar. 1990.
Kitagawa, M. et al., “Fiber Loop Interferometer for Quantum Cryptography”, QELS '97 Conference, May 18, 1997, pp. 18-19, XP010238246.
European Search Report for EP 05 00 4830, dated Dec. 10, 2007.
Hirano et al., “Quantum Cryptology using Pulsed Homodyne Detection”, The American Physical Society, Physical Review A, 68, (2003) pp. 042331-1 to 042331-7.
Shirasaki et al., “Squeezing of Pulses in a Nonlinear Interferometer”, Journal Optical Society of America, B. vol. 7, No. 1, (Jan.1990), pp. 30-34.
Nishizawa et al., “Squeezed Vacuum Generation using Symmetric Nonlinear Polarization Interferometer”, Japanese Journal Applied Physics, vol. 41 (2002), pp. L130-L132.
“Coherent Optical Communication”, Corona Publication Inc., (1988), pp. 25-26 and pp. 49-50, in Japanese.
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Hitachi , Ltd.
Reed Smith LLP
Singh Dalzid
LandOfFree
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