Article
Optics
Liang Fang, Jian Wang
Summary: The study reveals a new perspective on describing and explaining the topologically spin-dependent modal splitting of twisted light highly confined in optical fibers using classical IF shift, providing insights into the behavior of light propagating in optical fibers. By linking IF shift to the resonance of fiber Bragg gratings, the characteristics of light in optical fibers are further elucidated.
Article
Optics
Pavel S. Anisimov, Evgeny D. Tsyplakov, Viacheslav V. Zemlyakov, Jiexing Gao
Summary: We present an alternative method for compensating intermodal interactions in few-mode optical fibers using digital backpropagation. Instead of solving the inverse generalized multimode nonlinear Schrodinger equation, we utilize a deep neural network to backpropagate multimode signals based on their near-field intensity distributions captured by a camera. We demonstrate the feasibility of this approach by training an autoencoder for backpropagation of six linearly polarized modes in a step-index fiber.
CHINESE OPTICS LETTERS
(2023)
Review
Optics
Svetlana Nikolaevna Khonina, Nikolay Lvovich Kazanskiy, Muhammad Ali Butt, Sergei Vladimirovich Karpeev
Summary: This review presents an attention-grabbing and up-to-date overview of major multiplexing techniques, including wavelength division multiplexing, polarization division multiplexing, space division multiplexing, mode division multiplexing, and orbital angular momentum multiplexing. It also discusses hybrid multiplexing methods and techniques. This unique review paper highlights the most prominent and recent progress in multiplexing techniques in one place.
OPTO-ELECTRONIC ADVANCES
(2022)
Article
Physics, Applied
Yuxin Ding, Jianshe Li, Shuguang Li, Xiaokai Wang, Ying Guo, Xiaojian Meng, Yuanyuan Zhao, Huijing Du
Summary: In this paper, a broadband mode converter based on photonic crystal fiber (PCF) is proposed. Numerical results show that this mode converter has high mode coupling efficiency and mode extinction ratio, and it can realize cascade multiplexing. Additionally, a multi-core mode multiplexer structure is proposed, which allows the simultaneous reuse of three modes.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Jinhui Shen, Zheng Feng, Pengchao Xu, Dazhi Hou, Yang Gao, Xiaofeng Jin
Summary: The study found that the charge voltages generated by two counterpropagating spin currents in the Ag/Bi interface show opposite signs, consistent with the inverse spin Hall effect rather than the inverse Rashba-Eldestein effect. Using femtosecond laser to generate spin-current-induced terahertz signal in the Ag/Bi bilayer also showed no evidence for the inverse Rashba-Eldestein effect. This work provides a clear-cut method to identify the spin-to-charge mechanism in a Rashba electronic state and delivers new understanding for the relevant spin-transport phenomena.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Viktor M. Gololobov, Pavel S. Anisimov, Viacheslav V. Zemlyakov, Jiexing Gao
Summary: We propose a novel approach for designing refractive index profile functions in multimode optical fibers, which allows for independent control of mode properties. By introducing oscillating components, we demonstrate the successful acquisition of two modified graded-index multimode fibers with significantly reduced differential mode group delay. These optimized fiber properties can withstand realistic manufacture imperfections, highlighting the potential of our design scheme. Evaluation: 8/10.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Peng Shi, Xinrui Lei, Qiang Zhang, Heng Li, Luping Du, Xiaocong Yuan
Summary: Intrinsic spin-momentum locking is a fundamental property of surface electromagnetic fields, with important implications in various fields. Previous studies have ignored dispersion, leading to contradictions with physical reality. In this study, we present four dispersive spin-momentum equations that reveal the relationship between spin and momentum. Additionally, the locking behavior is influenced by structural features. By engineering rotational symmetry, the properties of spin-momentum locking can be identified in different photonic topological lattices.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Xiaofan Ji, Yaping Liu, Honglin Sun, Wenbo Yu, Zhiqun Yang, Lin Zhang
Summary: In this paper, we study the scaling of nonlinear impairment in coupled-core multi-core fibers (CC-MCFs) with different core counts. The results show that increasing the number of cores in CC-MCFs significantly weakens the nonlinear signal degradation, which is of great interest for ultralong-haul transmission. We further analyze the impact of fiber loss, differential group delay, and effective mode field area on this trend. Moreover, we compare CC-MCFs with few-mode fibers with the same number of spatial modes and find that CC-MCFs tend to have better nonlinear performance. It is also shown that few-mode fibers operated in a strong coupling regime are promising for long-haul transmission.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Shuangxi Zhang, Jianfei Liu, Xiangye Zeng, Jia Lu, Ying Wei, Ruiming Qi
Summary: A modified partitioned frequency domain equalization algorithm is proposed in this paper to address the slow convergence speed and poor equalization effect of digital equalizer in the polarization division multiplexed (PDM)-MDM system. Simulation results show that the modified algorithm can achieve significantly better SER performance and improve the convergence rate compared to the traditional algorithm.
Article
Optics
Xu Han, Yongheng Jiang, Andreas Frigg, Huifu Xiao, Pu Zhang, Thach Giang Nguyen, Andreas Boes, Jianhong Yang, Guanghui Ren, Yikai Su, Arnan Mitchell, Yonghui Tian
Summary: The study investigates the MDM and PDM technologies on a silicon nitride loaded LNOI platform, successfully designing and fabricating a mode (de)multiplexer and a polarization splitter-rotator with low insertion losses and minimal inter-modal crosstalk, suitable for high-capacity data communication applications.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Jian Cui, Yuyang Gao, Yu Yang, Dawei Ge, Yongqi He, Zhangyuan Chen, Juhao Li
Summary: This paper proposes a highly mode-selective PL-MMUX/MDEMUX design for intensity-modulation/direct-detection MDM transmission. By adopting non-degenerate modes or pairs of degenerate modes as independent channels and utilizing differential-phase injection (DPI) scheme and dissimilar core arrangement method, a very high modal selectivity is achieved.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yaping Liu, Zhiqun Yang, Xutao Wang, Yongmin Jung, Lin Zhang
Summary: This paper proposes a new design for few-mode erbium-doped fiber amplifiers (FM-EDFAs) that achieves significantly reduced differential modal gain (DMG) through strong mode coupling. A new numerical model based on a fiber transfer matrix is used to systematically investigate the DMGs of FM-EDFAs and analyze two different types of six-mode fiber amplifiers as exemplar demonstrations.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Han Wang, Takeshi Fujisawa, Takanori Sato, Takayoshi Mori, Taiji Sakamoto, Yoko Yamashita, Ryota Imada, Kazuhide Nakajima, Kunimasa Saitoh
Summary: We propose 6-mode and 10-mode photonic lantern mode multiplexers based on two-and three-layer silica planar lightwave circuitry, respectively. The 6-mode multiplexer achieves transmission greater than -0.19 dB at a wavelength of 1550 nm for six different modes. The 10-mode multiplexer is designed to excite selected modes and achieves transmission greater than -1.15 dB at a wavelength of 1550 nm.
OPTICS COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Peng Shi, Luping Du, Aiping Yang, Xiaojin Yin, Xinrui Lei, Xiaocong Yuan
Summary: In this study, a field theory was developed to reveal the physical origin and topological properties of longitudinal and transverse spins for arbitrary electromagnetic waves. The experimental results showed that the number of spin-momentum locking states coincides with the spin Chern number, providing valuable insight for constructing spin-based field theory and exploiting optical topological quasiparticle-based applications.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Yurou Jia, Yimin Liu, Bolun Hu, Wei Xiong, Yechao Bai, Ying Cheng, Dajian Wu, Xiaojun Liu, Johan Christensen
Summary: Multiplexing technology plays a crucial role in acoustic communication, and this study introduces a hybrid mode-frequency-division multiplexer on an acoustic metasurface decorated with carbon nanotube patches. By changing the azimuthal phase distribution, flexible combinations of OAM modes with diverse frequency shifts can be obtained, significantly increasing the communication capacity.
ADVANCED MATERIALS
(2022)
Article
Optics
Lars Rishoj, Fengyuan Deng, Boyin Tai, Ji-Xin Cheng, Siddharth Ramachandran
Article
Optics
X. Liu, E. N. Christensen, K. Rottwitt, S. Ramachandran
Article
Multidisciplinary Sciences
Aaron P. Greenberg, Gautam Prabhakar, Siddharth Ramachandran
NATURE COMMUNICATIONS
(2020)
Review
Nanoscience & Nanotechnology
Zelin Ma, Siddharth Ramachandran
Summary: Multimode fibers have attracted renewed attention due to the spatial diversity they offer, with circularly polarized orbital angular momentum modes being identified as the most stable eigenbasis for light propagation in suitably designed fibers. By manipulating light's path memory effects, a controllable means of tailoring light's phase is demonstrated, which has implications for using higher-order modes in optical fiber applications.
News Item
Optics
Filippo Cardano, Lorenzo Marrucci
Article
Optics
Alessio D'Errico, Raouf Barboza, Rebeca Tudor, Alexandre Dauphin, Pietro Massignan, Lorenzo Marrucci, Filippo Cardano
Summary: This paper successfully establishes a photonic quantum walk in the presence of a synthetic gauge field and explores its dynamics, focusing on the ballistic spreading behavior when the energy gaps are extremely small.
Article
Optics
Pegah Darvehi, Veronica Vicuna-Hernandez, Lorenzo Marrucci, Ester Piedipalumbo, Enrico Santamato, Bruno Piccirillo
Summary: A wide class of singular inhomogeneously polarized beams with nonuniform rotation rate of polarization azimuth are introduced in this study. They are obtained by adding extra phase modulation with m-fold rotational symmetry to the helical wavefronts of Poincare beams. The modulated Poincare beams have been theoretically studied and experimentally generated using tailored space-varying-axis plates based on liquid crystals.
Article
Physics, Multidisciplinary
Francesco Di Colandrea, Alessio D'Errico, Maria Maffei, Hannah M. Price, Maciej Lewenstein, Lorenzo Marrucci, Filippo Cardano, Alexandre Dauphin, Pietro Massignan
Summary: This paper investigates the analogy between the topological properties of Hofstadter Hamiltonians and the diffraction figures resulting from optical gratings. By establishing a one-to-one relation between Diophantine equations and the Bragg condition, the influence of structural disorder on the robustness of diffraction figures in optical gratings is discussed, which can be analogous to the robustness of transverse conductance in the quantum Hall effect.
NEW JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Raouf Barboza, Amin Babazadeh, Lorenzo Marrucci, Filippo Cardano, Corrado de Lisio, Vincenzo D'Ambrosio
Summary: The authors introduce a new optical encoding technique called linear photonic gears, which enables ultra-sensitive measurements of transverse displacements by mapping them into the polarization rotation of a laser beam. They argue that a resolution of 50 pm should be achievable with existing state-of-the-art technologies.
NATURE COMMUNICATIONS
(2022)
Article
Quantum Science & Technology
Chiara Esposito, Mariana R. Barros, Andres Duran Hernandez, Gonzalo Carvacho, Francesco Di Colandrea, Raouf Barboza, Filippo Cardano, Nicolo Spagnolo, Lorenzo Marrucci, Fabio Sciarrino
Summary: In this paper, we report the discrete-time quantum walk of two correlated photons in a two-dimensional lattice. The lattice is synthetically engineered by manipulating optical modes and mode-coupling is introduced via diffractive action of optical elements. The platform is compact, efficient, and scalable, making it a versatile tool for simulating quantum evolutions on complex lattices.
NPJ QUANTUM INFORMATION
(2022)
Proceedings Paper
Optics
Pegah Darvehi, Veronica Vicuna-Hernandez, Lorenzo Marrucci, Ester Piedipalumbo, Enrico Santamato, Bruno Piccirillo
Summary: A device based on liquid crystals is used to generate Poincare beams with spatially-variable polarization, displaying complex disclinations and higher-order disclinations. These beams show nonuniform rotation rates of local polarization azimuth, radial and azimuthal disclinations, lemon and star disclinations, and other complex structures.
INTERNATIONAL OPTICAL DESIGN CONFERENCE 2021
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Aaron P. Greenberg, Gautam Prabhakar, Siddharth Ramachandran
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Havva Begum Kabagoz, Siyuan Zhang, Lars Rishoj, Aku Antikainen, Siddharth Ramachandran
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Article
Physics, Multidisciplinary
Alessio D'Errico, Francesco Di Colandrea, Raouf Barboza, Alexandre Dauphin, Maciej Lewenstein, Pietro Massignan, Lorenzo Marrucci, Filippo Cardano
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Multidisciplinary
Francesco Graffitti, Vincenzo D'Ambrosio, Massimiliano Proietti, Joseph Ho, Bruno Piccirillo, Corrado de Lisio, Lorenzo Marrucci, Alessandro Fedrizzi
PHYSICAL REVIEW RESEARCH
(2020)