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Diffractive optics for combined spatial- and mode- division demultiplexing of optical vortices: design, fabrication and optical characterization.

Ruffato G, Massari M, Romanato F - Sci Rep (2016)

Bottom Line: During the last decade, the orbital angular momentum (OAM) of light has attracted growing interest as a new degree of freedom for signal channel multiplexing in order to increase the information transmission capacity in today's optical networks.Here we present the design, fabrication and characterization of phase-only diffractive optical elements (DOE) performing mode-division (de)multiplexing (MDM) and spatial-division (de)multiplexing (SDM) at the same time.These novel DOE designs appear promising for telecom applications both in free-space and in multi-core fibers propagation.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Astronomy 'G. Galilei', University of Padova, via Marzolo 8, 35131 Padova, Italy.

ABSTRACT
During the last decade, the orbital angular momentum (OAM) of light has attracted growing interest as a new degree of freedom for signal channel multiplexing in order to increase the information transmission capacity in today's optical networks. Here we present the design, fabrication and characterization of phase-only diffractive optical elements (DOE) performing mode-division (de)multiplexing (MDM) and spatial-division (de)multiplexing (SDM) at the same time. Samples have been fabricated with high-resolution electron-beam lithography patterning a polymethylmethacrylate (PMMA) resist layer spun over a glass substrate. Different DOE designs are presented for the sorting of optical vortices differing in either OAM content or beam size in the optical regime, with different steering geometries in far-field. These novel DOE designs appear promising for telecom applications both in free-space and in multi-core fibers propagation.

No MeSH data available.


Related in: MedlinePlus

Concept and principle of OAM-mode division demultiplexing (OAM-MDM) with diffractive optics.In the specific case: input OAM beam with ℓ = +3 impinges upon a DOE for OAM-MDM of 7 channels in the range ℓ = −3, …, +3. A bright spot appears in far-field in correspondence of the position for ℓ = +3.
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f1: Concept and principle of OAM-mode division demultiplexing (OAM-MDM) with diffractive optics.In the specific case: input OAM beam with ℓ = +3 impinges upon a DOE for OAM-MDM of 7 channels in the range ℓ = −3, …, +3. A bright spot appears in far-field in correspondence of the position for ℓ = +3.

Mentions: The phase pattern of a diffractive optics intended for expanding the incident light field into different diffraction orders (Fig. 1) is given by the linear combination of n angular harmonics {ψi = exp(iℓϑ)} as it follows20:


Diffractive optics for combined spatial- and mode- division demultiplexing of optical vortices: design, fabrication and optical characterization.

Ruffato G, Massari M, Romanato F - Sci Rep (2016)

Concept and principle of OAM-mode division demultiplexing (OAM-MDM) with diffractive optics.In the specific case: input OAM beam with ℓ = +3 impinges upon a DOE for OAM-MDM of 7 channels in the range ℓ = −3, …, +3. A bright spot appears in far-field in correspondence of the position for ℓ = +3.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4837364&req=5

f1: Concept and principle of OAM-mode division demultiplexing (OAM-MDM) with diffractive optics.In the specific case: input OAM beam with ℓ = +3 impinges upon a DOE for OAM-MDM of 7 channels in the range ℓ = −3, …, +3. A bright spot appears in far-field in correspondence of the position for ℓ = +3.
Mentions: The phase pattern of a diffractive optics intended for expanding the incident light field into different diffraction orders (Fig. 1) is given by the linear combination of n angular harmonics {ψi = exp(iℓϑ)} as it follows20:

Bottom Line: During the last decade, the orbital angular momentum (OAM) of light has attracted growing interest as a new degree of freedom for signal channel multiplexing in order to increase the information transmission capacity in today's optical networks.Here we present the design, fabrication and characterization of phase-only diffractive optical elements (DOE) performing mode-division (de)multiplexing (MDM) and spatial-division (de)multiplexing (SDM) at the same time.These novel DOE designs appear promising for telecom applications both in free-space and in multi-core fibers propagation.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Astronomy 'G. Galilei', University of Padova, via Marzolo 8, 35131 Padova, Italy.

ABSTRACT
During the last decade, the orbital angular momentum (OAM) of light has attracted growing interest as a new degree of freedom for signal channel multiplexing in order to increase the information transmission capacity in today's optical networks. Here we present the design, fabrication and characterization of phase-only diffractive optical elements (DOE) performing mode-division (de)multiplexing (MDM) and spatial-division (de)multiplexing (SDM) at the same time. Samples have been fabricated with high-resolution electron-beam lithography patterning a polymethylmethacrylate (PMMA) resist layer spun over a glass substrate. Different DOE designs are presented for the sorting of optical vortices differing in either OAM content or beam size in the optical regime, with different steering geometries in far-field. These novel DOE designs appear promising for telecom applications both in free-space and in multi-core fibers propagation.

No MeSH data available.


Related in: MedlinePlus