Limits...
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

Experimental optical response for a DOE performing combined OAM-MDM and SDM according to the scheme in Fig. 4.(a) Experimental output for input OAM+1,ch1, OAM−1,ch2 and OAM−3,ch3. (b) Total intensities in all detector regions for perfect vortex input modes, experimental data. For each channel, detection regions have the same size and are chosen such that they cover the intensity peak area. Intensities are normalized to the total collected energy.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4837364&req=5

f11: Experimental optical response for a DOE performing combined OAM-MDM and SDM according to the scheme in Fig. 4.(a) Experimental output for input OAM+1,ch1, OAM−1,ch2 and OAM−3,ch3. (b) Total intensities in all detector regions for perfect vortex input modes, experimental data. For each channel, detection regions have the same size and are chosen such that they cover the intensity peak area. Intensities are normalized to the total collected energy.

Mentions: Figure 11(a) exhibits the total far-field for three perfect vortices impinging on a DOE performing demultiplexing of three beam sizes with OAM values in the range {−3, −2, −1, 0, +1, +2, +3} according to the scheme in Fig. 4: ℓ = +1 on the first DOE ring (OAM+1,ch1), ℓ = −1 on the second DOE ring (OAM−1,ch2) and ℓ = −3 on the third DOE ring (OAM−3,ch3). In Figs 10(b) and 11(b), the total optical response is shown for both DOE samples. Channel cross-talk could be further reduced by decreasing vortex-ring widths.


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)

Experimental optical response for a DOE performing combined OAM-MDM and SDM according to the scheme in Fig. 4.(a) Experimental output for input OAM+1,ch1, OAM−1,ch2 and OAM−3,ch3. (b) Total intensities in all detector regions for perfect vortex input modes, experimental data. For each channel, detection regions have the same size and are chosen such that they cover the intensity peak area. Intensities are normalized to the total collected energy.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f11: Experimental optical response for a DOE performing combined OAM-MDM and SDM according to the scheme in Fig. 4.(a) Experimental output for input OAM+1,ch1, OAM−1,ch2 and OAM−3,ch3. (b) Total intensities in all detector regions for perfect vortex input modes, experimental data. For each channel, detection regions have the same size and are chosen such that they cover the intensity peak area. Intensities are normalized to the total collected energy.
Mentions: Figure 11(a) exhibits the total far-field for three perfect vortices impinging on a DOE performing demultiplexing of three beam sizes with OAM values in the range {−3, −2, −1, 0, +1, +2, +3} according to the scheme in Fig. 4: ℓ = +1 on the first DOE ring (OAM+1,ch1), ℓ = −1 on the second DOE ring (OAM−1,ch2) and ℓ = −3 on the third DOE ring (OAM−3,ch3). In Figs 10(b) and 11(b), the total optical response is shown for both DOE samples. Channel cross-talk could be further reduced by decreasing vortex-ring widths.

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