Demonstration of free-space one-to-many multicasting link from orbital angular momentum encoding

Fu, Shiyao; Zhai, Yanwang; Zhou, Heng; Zhang, Jianqiang; Wang, Tonglu; Yin, Ci; Gao, Chunqing

doi:10.1364/ol.44.004753

Cited by 48 publications

(14 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8 OAM offers an additional degree of freedom and leads to new possibilities for photonics research. Over the past 30 years, beams carrying OAM have found a wide variety of applications, including large-capacity communications, [9][10][11][12][13] rotation detection, [14][15][16] optical tweezers and manipulation, 17,18 imaging, 19 gravitational wave detection, 20,21 and quantum information processing. 22,23 Previous research has provided a variety of schemes to generate OAM beams, such as direct output from a laser [24][25][26][27][28] or endowing a Gaussian beam with spiral phases outside the laser resonator.…”

Section: Introductionmentioning

confidence: 99%

Orbital angular momentum comb generation from azimuthal binary phases

Shang

Hai

et al. 2022

Adv. Photon. Nexus

Self Cite

View full text Add to dashboard Cite

Since Allen et al. demonstrated 30 years ago that beams with helical wavefronts carry orbital angular momentum (OAM), the OAM of beams has attracted extensive attention and stimulated lots of applications in both classical and quantum physics. Akin to an optical frequency comb, a beam can carry multiple various OAM components simultaneously. A series of discrete, equally spaced, and equally weighted OAM modes comprise an OAM comb. Inspired by the spatially extended laser lattice, we demonstrate both theoretically and experimentally an approach to producing OAM combs through azimuthal binary phases. Our study shows that transition points in the azimuth determine the OAM distributions of diffracted beams. Multiple azimuthal transition points lead to a wide OAM spectrum. Moreover, an OAM comb with any mode spacing is achievable through reasonably setting the position and number of azimuthal transition points. The experimental results fit well with theory. This work presents a simple approach that opens new prospects for OAM spectrum manipulation and paves the way for many applications including OAM-based high-security encryption and optical data transmission, and other advanced applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Orbital angular momentum comb generation from azimuthal binary phases

Shang

Hai

et al. 2022

Adv. Photon. Nexus

Self Cite

View full text Add to dashboard Cite

show abstract

“…[11,12] Recently, an OAM encoding-based free-space one-to-many multicasting link was reported. [13] The successful multicopy replication for distributing the same signal to four different receivers was demonstrated. In ref.…”

Section: Introductionmentioning

confidence: 99%

Synthesizing Structured Optical Vortices

2022

View full text Add to dashboard Cite

A noniterative approach to generation of binary phase holograms is applied for synthesizing complex optical vortex arrays. This approach does not use inverse Fourier analysis and allows one to obtain arbitrary optical vortex arrays with specified topological charges, which cannot be obtained using conventional fork-shaped gratings. A topological charge of individual optical vortices generated using binary phase holograms can be specified at a given spatial frequency, so that the equidistant array of optical vortices can be generated via illuminating a hologram by a beam with the zero topological charge. The results of the calculation are consistent with the experimental data, including those of the interferometric measurements. The approach also makes it possible to synthesize superimposed optical vortices, where an optical field represents well-ordered circular arrays of optical singularities. An unusual behavior of phase dislocations in superimposed structures is found. For two optical vortices of same reciprocal lattice vectors, but different topological charges, spatial distribution of singularities are reconfigured in a such manner that a couple of concentric circular arrays of singularities appear. The proposed binary phase holograms offer new opportunities for synthesizing the complex optical vortex light fields, which can find light-matter interaction-based applications.

show abstract

“…Recently, there has been a great amount of research in using spatially structured light for FSOC. Among them, the orbital angular momentum (OAM) modes of light have been used most frequently and effectively to increase the information capacity of optical links [9][10][11][12]. However, atmospheric turbulence, mainly generated by vertical wind speed gradients and thermal convection, can significantly limits the practical range of satellite-to-earth optical communication.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric turbulence forecasting using two-stage variational mode decomposition and autoregression towards free-space optical data-transmission link

Guo

et al. 2022

Front. Phys.

Self Cite

View full text Add to dashboard Cite

Free space optical communication (FSOC) is a promising technology for satellite-to-earth communication systems, where vector beams, especially orbital angular momentum (OAM), can further increase the capacity of the optical link. However, atmospheric turbulence along the path can introduce intensity scintillation, wavefront aberrations and severe distortion of spatial patterns, leading to data degradation. Forecasting atmospheric turbulence allows for advanced scheduling of satellite-to-earth data transmission links, as well as the use of adaptive optics (AO) to compensate for turbulence effects and avoid data transmission link performance degradation. Therefore, atmospheric turbulence forecasting is critical for practical applications. In this work, we proposed a hybrid atmospheric turbulence forecasting model based on a two-stage variational mode decomposition (TsVMD) and autoregression model. The variational mode decomposition (VMD) algorithm is first used, to our best knowledge, to denoise the observed atmospheric turbulence dataset, and then is used again to decompose the datasets into several intrinsic mode functions (IMFs). Finally, the autoregression model is used to predict each IMF independently. And the predictions of each IMF are combined to obtain the final atmospheric turbulence predictions. Experiments employing the observed turbulence datasets and two additional methodologies were carried out to verify the performance of the proposed model. The experimental results show that the performance of the proposed model is much superior to that of the comparative methods.

show abstract

Demonstration of free-space one-to-many multicasting link from orbital angular momentum encoding

Cited by 48 publications

References 23 publications

Orbital angular momentum comb generation from azimuthal binary phases

Orbital angular momentum comb generation from azimuthal binary phases

Synthesizing Structured Optical Vortices

Atmospheric turbulence forecasting using two-stage variational mode decomposition and autoregression towards free-space optical data-transmission link

Contact Info

Product

Resources

About