Abstract

As a proof of concept, we experimentally demonstrate multiplexing of free-space optical signals in multiple channels labeled with different states of orbital angular momentum. The multiplexing process is carried out by a dynamic liquid-crystal spatial light modulator, while the phase function is calculated by an iterative algorithm. A binary amplitude computer-generated hologram serves as a demultiplexer.

© 2007 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]

2006

J. Lin, X.-C. Yuan, S. H. Tao, and R. E. Burge, "Synthesis of multiple collinear helical modes generated by a phase-only element," J. Opt. Soc. Am. A 23, 1214-1218 (2006).
[CrossRef]

R. Celechovsky and Z. Bouchal, "Generation of variable mixed vortex fields by a single static hologram," J. Mod. Opt. 53, 473-480 (2006).
[CrossRef]

2005

2004

G. Gibson, J. Courtial, M. J. Padgett, M. Vasnetsov, V. Pas'ko, S. M. Barnett, and S. Franke-Arnold, "Free-space information transfer using light beams carrying orbital angular momentum," Opt. Express 12, 5448-5456 (2004).
[CrossRef] [PubMed]

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, K. Jefimovs, and J. Turunen, "Generation and selection of laser beams represented by a superposition of two angular harmonics," J. Mod. Opt. 51, 761-773 (2004).
[CrossRef]

A. Jesacher, S. Furhapter, S. Bernet, and M. Ritsch-Marte, "Size selective trapping with optical 'cogwheel' tweezers," Opt. Express 12, 4129-4135 (2004).
[CrossRef] [PubMed]

Z. Bouchal and R. Celechovsky, "Mixed vortex states of light as information carriers," New J. Phys. 6, 131 (2004).
[CrossRef]

G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
[CrossRef]

2003

J. Curtis and D. Grier, "Structure of optical vortices," Phys. Rev. Lett. 90, 133901 (2003).
[CrossRef] [PubMed]

2002

A. T. O'Neil, I. MacVicar, L. Allen, and M. J. Padgett, "Intrinsic and extrinsic nature of the orbital angular momentum of a light beam," Phys. Rev. Lett. 88, 053601 (2002).
[CrossRef] [PubMed]

2001

G. Molina-Terriza, J. P. Torres, and L. Torner, "Management of the angular momentum of light: preparation of photons in multidimensional vector states of angular momentum," Phys. Rev. Lett. 88, 013601 (2001).
[CrossRef]

A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, "Entanglement of the orbital angular momentum states of photons," Nature 412, 313-316 (2001).
[CrossRef] [PubMed]

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, P. Paakkonen, J. Simonen, and J. Turunen, "An analysis of the angular momentum of a light field in terms of angular harmonics," J. Mod. Opt. 48, 1543-1557 (2001).
[CrossRef]

1999

1996

1995

H. He, M. Friese, N. Heckenberg, and H. Rubinsztein-Dunlop, "Direct observation of transfer of angular momentum to absorptive particles from a laser beam with a phase singularity," Phys. Rev. Lett. 75, 826-829 (1995).
[CrossRef] [PubMed]

1994

M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Woerdman, "Helical-wavefront laser beams produced with a spiral phaseplate," Opt. Commun. 112, 321-327 (1994).
[CrossRef]

1992

L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, "Orbital angular-momentum of light and the transformation of Laguerre-Gaussian laser modes," Phys. Rev. A 45, 8185-8189 (1992).
[CrossRef] [PubMed]

N. R. Heckenberg, R. McDuff, C. P. Smith, H. Rubinsztein-Dunlop, and M. J. Wegener, "Laser beams with phase singularities," Opt. Quantum Electron. 24, S951-S962 (1992).
[CrossRef]

1982

Appl. Opt.

J. Mod. Opt.

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, P. Paakkonen, J. Simonen, and J. Turunen, "An analysis of the angular momentum of a light field in terms of angular harmonics," J. Mod. Opt. 48, 1543-1557 (2001).
[CrossRef]

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, K. Jefimovs, and J. Turunen, "Generation and selection of laser beams represented by a superposition of two angular harmonics," J. Mod. Opt. 51, 761-773 (2004).
[CrossRef]

R. Celechovsky and Z. Bouchal, "Generation of variable mixed vortex fields by a single static hologram," J. Mod. Opt. 53, 473-480 (2006).
[CrossRef]

J. Opt. Soc. Am. A

J. Opt. Soc. Am. B

Nature

A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, "Entanglement of the orbital angular momentum states of photons," Nature 412, 313-316 (2001).
[CrossRef] [PubMed]

New J. Phys.

Z. Bouchal and R. Celechovsky, "Mixed vortex states of light as information carriers," New J. Phys. 6, 131 (2004).
[CrossRef]

Z. Bouchal, O. Haderka, and R. Celechovsky, "Selective excitation of vortex fiber modes using a spatial light modulator," New J. Phys. 7, 125 (2005).
[CrossRef]

Opt. Commun.

M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Woerdman, "Helical-wavefront laser beams produced with a spiral phaseplate," Opt. Commun. 112, 321-327 (1994).
[CrossRef]

Opt. Express

Opt. Lett.

Opt. Quantum Electron.

N. R. Heckenberg, R. McDuff, C. P. Smith, H. Rubinsztein-Dunlop, and M. J. Wegener, "Laser beams with phase singularities," Opt. Quantum Electron. 24, S951-S962 (1992).
[CrossRef]

Phys. Rev. A

L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, "Orbital angular-momentum of light and the transformation of Laguerre-Gaussian laser modes," Phys. Rev. A 45, 8185-8189 (1992).
[CrossRef] [PubMed]

Phys. Rev. Lett.

G. Molina-Terriza, J. P. Torres, and L. Torner, "Management of the angular momentum of light: preparation of photons in multidimensional vector states of angular momentum," Phys. Rev. Lett. 88, 013601 (2001).
[CrossRef]

H. He, M. Friese, N. Heckenberg, and H. Rubinsztein-Dunlop, "Direct observation of transfer of angular momentum to absorptive particles from a laser beam with a phase singularity," Phys. Rev. Lett. 75, 826-829 (1995).
[CrossRef] [PubMed]

A. T. O'Neil, I. MacVicar, L. Allen, and M. J. Padgett, "Intrinsic and extrinsic nature of the orbital angular momentum of a light beam," Phys. Rev. Lett. 88, 053601 (2002).
[CrossRef] [PubMed]

J. Curtis and D. Grier, "Structure of optical vortices," Phys. Rev. Lett. 90, 133901 (2003).
[CrossRef] [PubMed]

Proc. SPIE

G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Iterative algorithm producing the phase-only mask.

Fig. 2
Fig. 2

Some examples of binary amplitude CGH used to measure OAM states. For (a) and (c), white color and black color correspond to transmission of 1 and 0. (a) Pattern of CGH generating two helical beams of topological charge + 7 and 7 , (b) far-field intensity profile of pattern (a), (c) pattern of CGH generating four helical beams of topological charge + 3 , 3 , + 7 , and 7 , (d) far-field intensity profile of pattern (c).

Fig. 3
Fig. 3

(Color online) Schematic of the free-space optical communication system.

Fig. 4
Fig. 4

Intensity patterns captured by the CCD beam profiler. (a) Under the illumination of a T E M 00 laser mode, the numbers indicate topological charges appearing in corresponding orders when the channel state is ( 0 , 0 , 0 , 0 ) , (b) single OAM state of topological charge + 7 detection, i.e., the status of each channel is ( 0 , 0 , 1 , 0 ) in the order of channels ( + 3 , 3 , + 7 , 7 ).

Fig. 5
Fig. 5

Multiplexed OAM states measurements. (a) Numerically calculated power spectrum of status ( 1 , 0 , 1 , 1 ) , (b) numerically calculated power spectrum of status ( 1 , 1 , 1 , 1 ) , (c) intensity profile of a laser beam carrying mixed OAM states 7 , + 3 , and + 7 captured in the distance of 1   m from the SLM, (d) intensity profile of a laser beam carrying mixed OAM status 7 , 3 , + 3 , and + 7 captured in the distance of 1 m from the SLM, (e) measured far-field intensity profile of status ( 1 , 0 , 1 , 1 ) , (f) measured far-field intensity profile of status ( 1 , 1 , 1 , 1 ) .

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