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Photonic integrated devices for exploiting the orbital angular momentum of light in optical communications

Frontiers of Optoelectronics 2016年第3期9卷 518-525页

作者： Xinlun CAI Michael STRAIN Siyuan YU marc sorel State Key Laboratory of Optoelectronic Materials and Technologies and School of Microelectronics Sun Yatsen University Guangzhou 510275 China Institute of Photonics University of Strathclyde Glasgow G4 0NW UK School of Engineering University of Glasgow Glasgow G 12 8LT UK

Emerging applications based on optical beams carrying orbital angular momentum （OAM） will likely require photonic integrated devices and circuits for miniaturization, improved performance and enhanced functionality. This paper reviews the state-of-the art in the field of OAM of light, reports recent developments in silicon integrated OAM emitters, and discusses the applications potentials and challenges in silicon integrated OAM devices which can be used in future OAM based optical communications systems.

关键词： silicon photonics photonic integrated circuits (PICs) whispering gallery modes (WGMs) optical communications

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Passive mode-locking in semiconductor lasers with saturable absorbers bandgap shifted through quantum well intermixing

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Photonics Research 2014年第6期2卷 186-189页

作者： Vincenzo Pusino Michael J.Strain marc sorel School of Engineering University of Glasgow—Rankine BuildingOakfield AvenueGlasgow G128LTUK Institute of Photonics University of StrathclydeGlasgow G40NWUK

Passive mode-locking in semiconductor lasers in a Fabry–Perot configuration with a bandgap blueshift applied to the saturable absorber(SA)section has been experimentally *** the first time a fully post-growth technique,quantum well intermixing,was adopted to modify the material bandgap in the SA *** measurements showed not only an expected narrowing of the pulse width but also a significant expansion of the range of bias conditions generating a stable train of optical ***,the pulses from lasers with bandgap shifted absorbers presented reduced chirp and increased peak power with respect to the nonshifted case.

关键词： bandgap saturable lasers

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All-optical tuning of a diamond micro-disk resonator on silicon

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Photonics Research 2020年第3期8卷 318-324页

作者： PAUL HILL CHARALAMBOS KLITIS BENOIT GUILHABERT marc sorel ERDAN GU MARTIN D.DAWSON MICHAEL J.STRAIN Institute of Photonics Department of PhysicsTechnology and Innovation CentreUniversity of StrathclydeGlasgow G11RDUK Diamond Science and Technology Centre for Doctoral TrainingUniversity of WarwickCoventry CV47ALUK School of Engineering University of GlasgowGlasgow G128LTUK

High-quality integrated diamond photonic devices have previously been demonstrated in applications from nonlinear photonics to on-chip quantum ***,the small sample sizes of single crystal material available,and the difficulty in tuning its optical properties,are barriers to the scaling of these *** of these issues can be addressed by integrating micrometer-scale diamond devices onto host photonic integrated circuits using a highly accurate micro-assembly *** this work a diamond micro-disk resonator is integrated with a standard single-mode silicon-on-insulator waveguide,exhibiting an average loaded Q-factor of 3.1×10^4 across a range of spatial modes,with a maximum loaded Q-factor of 1.05×10^*** micrometer-scale device size and high thermal impedance of the silica interface layer allow for significant thermal loading and continuous resonant wavelength tuning across a 450 pm range using a milliwatt-level optical *** diamond-on-demand integration technique paves the way for tunable devices coupled across large-scale photonic circuits.

关键词： tuning resonator waveguide

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Manipulating optical vortices using integrated photonics

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Frontiers of Optoelectronics 2016年第2期9卷 194-205页

作者： Ning ZHANG Kenan CICEK Jiangbo ZHU Shimao LI Huanlu LI marc sorel Xinlun CAI Siyuan YU Photonics Group University of Bristol Bristol BS8 1UB UK State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University Guangzhou 510275 China School of Engineering University of Glasgow Glasgow G12 8QQ UK

Optical vortices （OVs） refer to a class of cylindrical optical modes with azimuthally varying phase terms arising either from polarization rotation or from the angular projection of the wave vector that at the quantum level corresponds to photon spin or orbital angular momenta. OVs have attracted the attention of researchers in many areas of optics and photonics, as their potential applications range from optical communications, optical manipulation, imaging, sensing, to quantum information. In recent years, integrated photonics has becomes an effective method of manipulating OVs. In this paper, the theoretical framework and experimental progress of integrated photonics for the manipulation of OVs were reviewed.

关键词： optical vortex orbital angular momentum,angular grating micro-ring resonator

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Separating arbitrary free-space beams with an integrated photonic processor

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Light(Science & Applications) 2022年第8期11卷 1811-1822页

作者： Maziyar Milanizadeh SeyedMohammad SeyedinNavadeh Francesco Zanetto Vittorio Grimaldi Christian De Vita Charalambos Klitis marc sorel Giorgio Ferrari David A.B.Miller Andrea Melloni Francesco Morichetti Department of Electronics Information and BioengineeringPolitecnico di Milanovia Ponzio 34/520133MilanoItaly School of Engineering University of GlasgowGlasgowG128QQUK TeCIP Institute Scuola Superiore Sant’Anna56124PisaItaly Ginzton Laboratory Stanford UniversitySpilker BuildingStanfordCA94305USA

Free-space optics naturally offers multiple-channel communications and sensing exploitable in many applications. The different optical beams will, however, generally be overlapping at the receiver, and, especially with atmospheric turbulence or other scattering or aberrations, the arriving beam shapes may not even be known in advance. We show that such beams can be still separated in the optical domain, and simultaneously detected with negligible cross-talk, even if they share the same wavelength and polarization, and even with unknown arriving beam shapes. The kernel of the adaptive multibeam receiver presented in this work is a programmable integrated photonic processor that is coupled to free-space beams through a two-dimensional array of optical antennas. We demonstrate separation of beam pairs arriving from different directions, with overlapping spatial modes in the same direction, and even with mixing between the beams deliberately added in the path. With the circuit’s optical bandwidth of more than 40 nm, this approach offers an enabling technology for the evolution of FSO from single-beam to multibeam space-division multiplexed systems in a perturbed environment, which has been a game-changing transition in fiber-optic systems.

关键词： processor polarization scattering

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Direct fiber vector eigenmode multiplexing transmission seeded by integrated optical vortex emitters

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Light(Science & Applications) 2017年第1期6卷 175-180页

作者： Jun Liu Shi-Mao Li Long Zhu An-Dong Wang Shi Chen Charalambos Klitis Cheng Du Qi Mo marc sorel Si-Yuan Yu Xin-Lun Cai Jian Wang Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Optoelectronic Materials and Technologies and School of Physics and Engineering Sun Yatsen UniversityGuangzhou 510275China School of Engineering University of GlasgowRankine BuildingOakfield AvenueGlasgow G128LTUK Fiberhome Telecommunication Technologies Co.Ltd Wuhan 430074China

Spatial modes have received substantial attention over the last decades and are used in optical communication *** fiber-optic communications,the employed linearly polarized modes and phase vortex modes carrying orbital angular momentum can be synthesized by fiber vector *** improve the transmission capacity and miniaturize the communication system,straightforward fiber vector eigenmode multiplexing and generation of fiber-eigenmode-like polarization vortices(vector vortex modes)using photonic integrated devices are of substantial ***,we propose and demonstrate direct fiber vector eigenmode multiplexing transmission seeded by integrated optical vortex *** exploiting vector vortex modes(radially and azimuthally polarized beams)generated from silicon microring resonators etched with angular gratings,we report data-carrying fiber vector eigenmode multiplexing transmission through a 2-km large-core fiber,showing low-level mode crosstalk and favorable link *** demonstrations may open up added capacity scaling opportunities by directly accessing multiple vector eigenmodes in the fiber and provide compact solutions to replace bulky diffractive optical elements for generating various optical vector beams.

关键词： fiber-optic communications fiber vector eigenmode multiplexing optical vortex photonic integrated devices

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