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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  19. R. Celechovsky and Z. Bouchal, "Generation of variable mixed vortex fields by a single static hologram," J. Mod. Opt. 53, 473-480 (2006).
    [CrossRef]
  20. 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).
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    [CrossRef]
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    [CrossRef]

2006 (2)

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 (3)

2004 (5)

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 (1)

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

2002 (1)

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 (3)

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 (1)

1996 (1)

1995 (1)

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 (1)

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 (2)

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 (1)

Appl. Opt. (1)

J. Mod. Opt. (3)

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 (1)

J. Opt. Soc. Am. B (1)

Nature (1)

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. (2)

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. (1)

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 (3)

Opt. Lett. (2)

Opt. Quantum Electron. (1)

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 (1)

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. (4)

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 (1)

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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