Optical implementation of the vortex information channel

Čelechovský, Radek; Bouchal, Zdeněk

doi:10.1088/1367-2630/9/9/328

Cited by 85 publications

(38 citation statements)

References 16 publications

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“…In contrast to SAM, which has only two possible states of left-handed and right-handed circular polarizations, the states of OAM are in principle unlimited owing to the unique characteristics of spiral flow of propagating EM waves [55]. The OAM has the potential to tremendously increase the spectral efficiency and capacity of communication systems [85]. Among numerous investigations on OAM effects, one of the subjects of intensive recent studies is the link between the near-field chirality and the far-field OAM.…”

Section: Transfer Of Sam Into Oam Of the Bsc With M =mentioning

confidence: 99%

Light Trapping above the Light Cone in One-Dimensional Arrays of Dielectric Spheres

2017

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Abstract:We demonstrate bound states in the radiation continuum (BSC) in a linear periodic array of dielectric spheres in air above the light cone. We classify the BSCs by orbital angular momentum m = 0, ±1, ±2 according to the rotational symmetry of the array, Bloch wave vector β directed along the array according to the translational symmetry, and polarization. The most simple symmetry protected BSCs have m = 0, β = 0 and occur in a wide range of the radius of the spheres and dielectric constant. More sophisticated BSCs with m = 0, β = 0 exist only for a selected radius of spheres at fixed dielectric constant. We also find robust Bloch BSCs with β = 0, m = 0. All BSCs reside within the first but below the other diffraction continua. We show that the BSCs can be easily detected by bright features in scattering of different plane waves by the array as dependent on type of the BSC. The symmetry protected TE/TM BSCs can be traced by collapsing Fano resonance in cross-sections of normally incident TE/TM plane waves. When plane wave with circular polarization with frequency tuned to the bound states with OAM illuminates the array the spin angular momentum of the incident wave transfers into the orbital angular momentum of the BSC. This, in turn, gives rise to giant vortical power currents rotating around the array. Incident wave with linear polarization with frequency tuned to the Bloch bound state in the continuum induces giant laminar power currents. At last, the plane wave with linear polarization incident under tilt relative to the axis of array excites Poynting currents spiralling around the array. It is demonstrated numerically that quasi-bound leaky modes of the array can propagate both stationary waves and light pulses to a distance of 60 wavelengths at the frequencies close to the bound states in the radiation continuum. A semi-analytical estimate for decay rates of the guided waves is found to match the numerical data to a good accuracy.

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Section: Transfer Of Sam Into Oam Of the Bsc With M =mentioning

confidence: 99%

Light Trapping above the Light Cone in One-Dimensional Arrays of Dielectric Spheres

2017

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“…OV beams have helical phase profiles in their electric fields that are proportional to the azimuthal phase term of exp(i'w), where ' is the eigenvalue of the OAM or the so-called topological charge and w is the azimuthal angle. In principle, the values of ' are unlimited, which makes it possible to use the OAM states as information channels to carry signals [12][13][14][15] for data transmission. The superior security advantages of OAM channels have also been demonstrated in both classical and quantum communication systems.…”

Section: Introductionmentioning

confidence: 99%

“…The superior security advantages of OAM channels have also been demonstrated in both classical and quantum communication systems. [14][15][16][17][18][19] OAM-based optical communications can be classified into two different categories: OAM shift keying (OAM-SK) and OAM division multiplexing (OAM-DM). For OAM-SK, the OAM states of the OV beams are regarded as a modulation format that enables the encoding of information by dynamic switching of spatial light modulators.…”

Section: Introductionmentioning

confidence: 99%

Massive individual orbital angular momentum channels for multiplexing enabled by Dammann gratings

et al. 2015

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Data transmission rates in optical communication systems are approaching the limits of conventional multiplexing methods. Orbital angular momentum (OAM) in optical vortex beams offers a new degree of freedom and the potential to increase the capacity of free-space optical communication systems, with OAM beams acting as information carriers for OAM division multiplexing (OAM-DM). We demonstrate independent collinear OAM channel generation, transmission and simultaneous detection using Dammann optical vortex gratings (DOVGs). We achieve 80/160 Tbit s 21 capacity with uniform power distributions along all channels, with 1600 individually modulated quadrature phase-shift keying (QPSK)/16-QAM data channels multiplexed by 10 OAM states, 80 wavelengths and two polarizations. DOVG-enabled OAM multiplexing technology removes the bottleneck of massive OAM state parallel detection and offers an opportunity to raise optical communication systems capacity to Pbit s 21 level.

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“…The fact that these fields offer an unbounded state space has made them advantageous for increasing the amount of information that can be encoded onto a single-photon [5][6][7][8][9][10][11]. In particular, higher-order Bessel beams are interesting as OAM-carriers as these fields propagate while maintaining their cross-sectional form over a finite distance [12][13][14][15] and reconstruct after encountering an obstacle [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Efficient sorting of Bessel beams

Mhlanga

Dudley

McDonald

et al. 2013

Complex Light and Optical Forces VII

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Abstract:We demonstrate the efficient sorter of Bessel beams separating both the azimuthal and radial components. This is based upon the recently reported transformation of angular to transverse momentum states. We separately identify over forty azimuthal and radial components, with a radial spacing of 1588 m −1 , and outline how the device could be used to identify the two spatial dimensions simultaneously.

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Optical implementation of the vortex information channel

Cited by 85 publications

References 16 publications

Light Trapping above the Light Cone in One-Dimensional Arrays of Dielectric Spheres

Light Trapping above the Light Cone in One-Dimensional Arrays of Dielectric Spheres

Massive individual orbital angular momentum channels for multiplexing enabled by Dammann gratings

Efficient sorting of Bessel beams

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