Photonic crystal fiber for supporting 26 orbital angular momentum modes

Hu, Ziang; Huang, Yuqi; Luo, Aiping; Cui, Hu; Luo, Zhi‐Chao; Xu, Wen‐Cheng

doi:10.1364/oe.24.017285

Cited by 75 publications

(41 citation statements)

References 31 publications

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“…Solid annular-core fibers have shown interesting results [16,18,19] but have limitations in terms of achievable intermodal separations, chromatic dispersion and mode selection. Microstructured fibers and photonic crystal fibers (PCF) in particular have recently attracted significant research interest towards alleviating the above limitations of solid-core fibers by exploiting the significantly increased design freedom afforded by the holey structure and the unique modal properties that emerge [21][22][23][24][25][26]. A particular design of annular-core photonic crystal fiber (AC-PCF) recently proposed the theoretical ability to enforce mono-radial vector-vortex mode guiding while preventing higher-radial order modes over a very large bandwidth [27].…”

Section: Mode Structure and Attenuation In Ac-pcfmentioning

confidence: 99%

Transmission of Orbital Angular Momentum and Cylindrical Vector Beams in a Large-Bandwidth Annular Core Photonic Crystal Fiber

Sharma

Amirkhan

Mishra

et al. 2020

Fibers

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The stable propagation of orbital angular momentum and cylindrical vector beams in a newly designed annular core photonic crystal fiber (AC-PCF) tailored for the broadband single-radial order beam transmission (within the so-called “endlessly mono-radial” guiding regime) is demonstrated for the first time. It is shown that the vector-vortex beams can maintain high mode purities above 18 dB after propagation in the fiber under test over all of the wavelength range from 805 to 845 nm (over 17 THz bandwidth) investigated with the help of a tunable laser and an S-plate for the generation of singular beams in free space. Our results confirm that the AC-PCF is a promising design for the broadband transmission of vector-vortex beams that have potential applications in space-division multiplexing, quantum communications, optical sensing and trapping.

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Section: Mode Structure and Attenuation In Ac-pcfmentioning

confidence: 99%

Transmission of Orbital Angular Momentum and Cylindrical Vector Beams in a Large-Bandwidth Annular Core Photonic Crystal Fiber

Sharma

Amirkhan

Mishra

et al. 2020

Fibers

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“…In order to make the complete circular symmetry structure, the outer three rings of air holes are the same size but different gaps, while the size of the innermost ring of air holes is larger than that of other three rings. The base material of the fiber is As2S3 glass [40]. The outcome of this fiber design is only to increase the number of OAM modes based on the PCF structure in Ref.…”

Section: Circular Pcfsmentioning

confidence: 99%

“…Cross section and structure parameters of (a) the microstructure ring fiber (reprinted from [37] by permission from Elsevier), and (b) ring PCF (reprinted with permission from [40]. Copyright 2016 Optical Society of America).…”

Section: Circular Pcfsmentioning

confidence: 99%

The Orbital Angular Momentum Modes Supporting Fibers Based on the Photonic Crystal Fiber Structure

Zhang

et al. 2017

Crystals

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Abstract:The orbital angular momentum (OAM) of light can be another physical dimension that we exploit to make multiplexing in the spatial domain. The design of the OAM mode supporting fiber attracts many attentions in the field of the space division multiplexing (SDM) system. This paper reviews the recent progresses in photonic crystal fiber (PCF) supporting OAM modes, and summarizes why a PCF structure can be used to support stable OAM transmission modes. The emphasis is on the circular PCFs, which possess many excellent features of transmission performance, such as good-quality OAM modes, enough separation of the effective indices, low confinement loss, flat dispersion, a large effective area, and a low nonlinear coefficient. We also compare the transmission properties between the circular PCF and the ring core fiber, as well as the properties between the OAM EDFA based on circular PCF and the OAM EDFA based on the ring core fiber. At last, the challenges and prospects of OAM fibers based on the PCF structure are also discussed.

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“…However, the complex up-doping process and precise control of the relatively thin ring-core makes the fiber fabrication process difficult [14]. Besides the up-doing fibers, several ring-core OAM fibers based on the photonic crystal structure have been proposed [15][16][17][18]. Photonic crystal fibers (PCFs) with a hexagonal lattice is the traditional structure, but they can only support a few OAM modes due to the unsatisfactory OAM mode quality caused by the non-circular core profile.…”

Section: Introductionmentioning

confidence: 99%

“…Photonic crystal fibers (PCFs) with a hexagonal lattice is the traditional structure, but they can only support a few OAM modes due to the unsatisfactory OAM mode quality caused by the non-circular core profile. Therefore, circular type PCFs have been proposed to support a large number of OAM modes with good quality [15,17,18], and their cross-section is as shown in Fig. 1(a).…”

Section: Introductionmentioning

confidence: 99%

Ring-core fiber with negative curvature structure supporting orbital angular momentum modes

Tu¹,

Liu²,

Gao³

et al. 2019

Opt. Express

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Compared to glass walls with a positive curvature, those with a negative curvature have been proven to have stronger confinement of light. Therefore, we change the multi-layered air holes in a photonic crystal fiber into several negative curvature tubes. As a result, the confinement medium is shifted from a low-index cladding material into a special structure. The theoretical analysis shows that each vector eigenmode has a corresponding threshold value for the outer tube thickness. It means that we can confine the target modes and filter the unnecessary modes by shifting the outer tube thickness. After substantial investigation on this fiber, we obtain the appropriate values for each structural parameter and then fabricate this negative curvature ring-core fiber under the guidance of the simulation results. Firstly, we draw the central cane under vacuum condition, then stack the cane and six capillaries to form the preform, and finally draw the ring-core fiber by using vacuumization method. The fiber test experiment indicates that the fiber length should be at least 15 m∼20 m to form the donut facula, and the tested losses of OAM +1,1 , OAM +2,1 , OAM +3,1 , and OAM +4,1 are 0.30 dB/m, 0.36 dB/m, 0.37 dB/m, and 0.42 dB/m, respectively.

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Photonic crystal fiber for supporting 26 orbital angular momentum modes

Cited by 75 publications

References 31 publications

Transmission of Orbital Angular Momentum and Cylindrical Vector Beams in a Large-Bandwidth Annular Core Photonic Crystal Fiber

Transmission of Orbital Angular Momentum and Cylindrical Vector Beams in a Large-Bandwidth Annular Core Photonic Crystal Fiber

The Orbital Angular Momentum Modes Supporting Fibers Based on the Photonic Crystal Fiber Structure

Ring-core fiber with negative curvature structure supporting orbital angular momentum modes

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