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Sudden Death of Entanglement induced by Polarization Mode Dispersion
Cristian Antonelli, Mark Shtaif, Mikhail Brodsky
Physical Review Letters,
2011.
[PDF]
[BIB]
American Physical Society Copyright
The definitive version was published in Physical Review Letters, APS. , 2011-02-02
{We study the decoherence of polarization-entangled photon pairs subject to the effects of polarization mode dispersion, the chief polarization decoherence mechanism in optical fibers. We show that fiber propagation reveals an intriguing interplay between the concepts of entanglement sudden death, decoherence-free sub-spaces and non-locality. We define the boundaries in which entanglement-based quantum communications protocols relying on fiber propagation can be applied. }
Research Highlights: Optical Systems Research at AT&T Labs
Martin Birk, Mikhail Brodsky, Mark Feuer, Patrick Iannone, Peter Magill, Jonathan Nagel, Lynn Nelson, Kenneth Reichmann, Sheryl Woodward, Xiang Zhou
IEEE Photonics Newsletter,
2011.
[PDF]
[BIB]
IEEE Copyright
This version of the work is reprinted here with permission of IEEE for your personal use. Not for redistribution. The definitive version was published in IEEE Photonics Newsletter. , 2011-07-01
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Nonlocal compensation of Polarization Mode Dispersion in the transmission of non-stationary streams of polarization entangled photons
Mikhail Brodsky, Mark Shtaif, Cristian Antonelli
Optics Express,
2011.
[PDF]
[BIB]
Optical Society of America Copyright
The definitive version was published in Optics Express , 2011-01-01
{We study the feasibility of nonlocally compensating for polarization mode dispersion (PMD), when polarization entangled photons are distributed in fiber-optic channels.We quantify the effectiveness of nonlocal compensation while taking into account the possibility that entanglement is generated through the use of a pulsed optical pump signal.}
Rayleigh backscattering from optical fibers � could it be used to identify individual fibers?
Mikhail Brodsky, Jungmi Oh, Moshe Tur, Paul Henry
FiO 2010,
2010.
[PDF]
[BIB]
Optical Society of America Copyright
The definitive version was published in FiO 2010. , 2010-10-19
{We probe stochastic fluctuations in Rayleigh backscattering with a photon-counting
OTDR apparatus. Surprisingly, the statistics of these fluctuations can be captured by a simple
empirical model. The temporal stability of the data is discussed.}
Disentanglement due to polarization mode dispersion in optical fibers: from nonlocal compensation to entanglement sudden death.
Mikhail Brodsky, Cristian Antonelli, Mark Shtaif
FiO 2010,
2010.
[BIB]
Optical Society of America Copyright
The definitive version was published in FiO 2010. , 2010-10-19
{We propagate pairs of polarization-entangled photons through optical fibers with polarization-mode dispersion (PMD). We observe non-local PMD compensation and the transition to sudden death of entanglement when the alignment of the compensating element is varied.}
Disappearance of Polarization Entanglement due to the relative orientation of two fiber�s PMD vectors.
Mikhail Brodsky, Cristian Antonelli, Mark Shtaif
ECOC 2010,
2010.
[BIB]
{We study propagation of polarization-entangled photon pairs through optical fibers with
polarization-mode dispersion (PMD). We observe abrupt loss and revival of entanglement as the PMD
vector of one fiber rotates relative to the PMD vector of the other fiber.}
Interferometric Method And Apparatus For Measuring Optical Signal Quality In Optical Communications System,
Tue Sep 13 16:06:07 EDT 2011
Differences in the interferometric patterns of modulated telecommunication signals and broadband optical noise sources are identified and are exploited in measuring the optical signal-to-noise measurements in reconfigurable photonic networks. A light output power from said interferometer corresponding to a specified delay setting in the interferometer is measured, and a coherent optical signal is distinguished from the incoherent optical noise based on the light output power measurement.
Method And Apparatus For Measuring The Birefringence Autocorrelation Length In Optical Fibers,
Tue Jun 28 16:05:36 EDT 2011
Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spectrum. The birefringence autocorrelation length is determined from the measuring of the PMD and the Faraday rotation angle.
Method And Apparatus For Broadband Mitigation Of Polarization Mode Dispersion,
Tue Jan 11 16:04:20 EST 2011
Described is a method and system for reducing system penalty from polarization mode dispersion. The method includes receiving a plurality of signals at a receiving end of a transmission line, each signal being received on one of a plurality of channels of the transmission line and measuring a signal degradation of at least one of the channels of the transmission line. An amount of adjustment of a polarization controller is determined based on the signal degradation, the amount of adjustment being selected to reduce the polarization mode dispersion. The amount of adjustment is then transmitted to the polarization controller.
Method For Increasing Accuracy Of Measurement Of Mean Polarization Mode Dispersion,
Tue Dec 14 15:05:19 EST 2010
The present invention provides a method of determining a mean differential group delay associated with a length of optical fiber. The method including measuring a magnitude of a polarization mode dispersion vector as a function of frequency, using a frequency-domain polarization mode dispersion measurement apparatus, where the magnitude of the polarization mode dispersion vector is a scalar differential group delay. Also the method calculates a frequency derivative of the scalar differential group delay from the magnitude of the polarization mode dispersion vector to obtain a first result. The frequency derivative of the scalar differential group delay being a scalar second-order polarization mode dispersion function. The method further multiplies a proportionality coefficient B.sub.2 by the first result to calculate the mean differential group delay. Also, the method outputs a value of the mean differential group delay.
Estimating Optical Transmission System Penalties Induced By Polarization Mode Dispersion (PMD),
Tue Aug 10 15:04:22 EDT 2010
Polarization mode dispersion (PMD) induced system penalty .epsilon. is determined from optical characteristics of an optical wavelength division multiplexed (WDM) signal that is carried on a network. The method involves tapping the optical WDM signal, separating an optical channel from the tapped optical WDM signal, performing a frequency-resolved state of polarization (SOP) measurement on the channel, and computing the PMD-induced system penalty as .epsilon.=AL.sup.2+BL.sup.4, in which A and B are predetermined parameters and L is an SOP string length based on the SOP measurement.
Method And Apparatus For Measuring The Birefringence Autocorrelation Length In Optical Fibers,
Tue Mar 30 15:03:39 EDT 2010
Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spectrum. The birefringence autocorrelation length is determined from the measuring of the PMD and the Faraday rotation angle.
Systems, Devices, And Methods For Controlling Outage Probabilities,
Tue Jun 09 16:07:29 EDT 2009
Certain exemplary embodiments comprise a method that can comprise, responsive to an instruction to change a setting of a polarization controller, automatically changing a first rotational speed of a birefringent plate associated with the polarization controller to orient the birefringent plate pseudo-randomly over time with respect to a predetermined axis.
Interferometric Method For Measuring Optical Signal Quality In Optical Communication Systems,
Tue Mar 03 16:07:19 EST 2009
Differences in the interferometric patterns of modulated telecommunication signals and broadband optical noise sources are identified and are exploited in measuring the optical signal-to-noise measurements in reconfigurable photonic networks. A light output power from said interferometer corresponding to a specified delay setting in the interferometer is measured, and a coherent optical signal is distinguished from the incoherent optical noise based on the light output power measurement.
Estimating optical transmission system penalties induced by polarization mode dispersion (PMD),
Tue Aug 19 18:12:59 EDT 2008
Polarization mode dispersion (PMD) induced system penalty .epsilon. is determined from optical characteristics of an optical wavelength division multiplexed (WDM) signal that is carried on a network. The method involves tapping the optical WDM signal, separating an optical channel from the tapped optical WDM signal, performing a frequency-resolved state of polarization (SOP) measurement on the channel, and computing the PMD-induced system penalty as .epsilon.=AL.sup.2+BL.sup.4, in which A and B are predetermined parameters and L is an SOP string length based on the SOP measurement.
Method for increasing accuracy of measurement of mean polarization mode dispersion,
Tue Nov 06 18:12:21 EST 2007
The present invention provides a method for increasing the accuracy of measurement of mean differential group delay (DGD) from the polarization mode dispersion (PMD) in optical fiber. The method includes a systematic correction to mean-square DGD measured with any conventional mean to minimize systematic error caused by finite source bandwidth. The method further includes a systematic correction to the measurement of mean DGD and mean square DGD from statistics of the second-order PMD (SOPMD) obtained with frequency domain PMD-measuring apparatus. The probability density function (PDF) of either the vector or scalar SOPMD is applied, depending on which quantity is measured. The systematic correction is made to minimize the systematic error in estimating mean DGD, caused by finite source bandwidth, to achieve a two-fold reduction of the measurement variance equivalent to doubling the source bandwidth.
Estimating optical transmission system penalties induced by polarization mode dispersion (PMD),
Tue Aug 14 18:12:10 EDT 2007
Polarization mode dispersion (PMD) induced system penalty .epsilon. is determined from optical characteristics of an optical wavelength division multiplexed (WDM) signal that is carried on a network. The method involves tapping the optical WDM signal, separating an optical channel from the tapped optical WDM signal, performing a frequency-resolved state of polarization (SOP) measurement on the channel, and computing the PMD-induced system penalty as .epsilon.=AL.sup.2+BL.sup.4, in which A and B are predetermined parameters and L is an SOP string length based on the SOP measurement.
Method and apparatus for measuring frequency-resolved states of polarization of a working optical channel using polarization-scrambled heterodyning,
Tue Feb 06 18:11:52 EST 2007
An apparatus for measuring a set of frequency-resolved states of polarization (SOP) of an optical signal includes a local oscillator (LO), a polarization scrambler, a coupler for mixing the polarization-scrambled signal with the optical signal to produce a heterodyned signal with a radio frequency (RF) component, and an analyzer for passing a fixed polarization component and resolving the polarization and frequency from the RF component. The apparatus is used for measuring, monitoring or compensating the polarization mode dispersion (PMD) in a working channel of an optical telecommunication system. A method for measuring frequency-resolved SOP of an optical signal includes tuning and polarization-scrambling a local oscillator (LO), mixing the scrambled LO with the optical signal, and resolving the RF signal in frequency and polarization. The method is applied to measure and monitor PMD in a working optical channel, and to dynamically compensate for the PMD.
