Transmission of Orbital Angular Momentum Modes in Grapefruit-Type Microstructure Fiber

Wen, 乔文 Qiao; Shecheng, 高社成 Gao; Ting, 雷霆 Lei; Hong, 吉虹 Ji; Yinlan, 阮银兰 Ruan; Xie, Zhenwei; Chuanwu, 杨传武 Yang; Xiao-cong, 袁小聪 Yuan

doi:10.3788/cjl201744.0406002

Cited by 4 publications

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“…Finally, there is a set of works, prepared by the same group of authors, that demonstrates the experimentally verified stable transmission of 12 OAM modes over a C-band along a designed and fabricated HRC optical fiber with an air core diameter of 6 µm, bounded by a ring with a wall thickness of 5.25 µm, and where ∆n = 0.03 [3,[46][47][48][49], with the following enhancing the AOM mode quantity up to 28 by enlarging the air core diameter up to 19 µm under the same ring parameters [50]. On the other hand, other "experimental" papers have presented the propagation of OAM modes over ring-core optical fibers [1][2][3]9,10,[51][52][53] and hollow-core "grapefruit" MOFs [3,38,54,55]. In addition, twisted or spun MOFs and PCFs are not only declared to be a new (alternative to the primarily fiber Bragg gratings) type of fiber optic probe for sensing strain/twisting [56][57][58], magnetic field/electric current [59], special optical fibers for polarization maintenance, the generation of optical activity [60][61][62][63][64][65], or mode filtration [66], but they are also positioned as new optical fibers with great potentiality for guiding and transmitting OAM modes, as confirmed by not only theoretical simulations [3,[67][68][69][70][71] but also by experimental studies [72][73][74]…”

Section: Introductionmentioning

confidence: 99%

Twisted Silica Few-Mode Hollow GeO2-Doped Ring-Core Microstructured Optical Fiber

et al. 2023

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This work presents the first instance of a silica few-mode microstructured optical fiber (MOF) being successfully fabricated with a hollow GeO2-doped ring core and by strongly inducing twisting up to 790 revolutions per meter. Some technological issues that occurred during the manufacturing of the GeO2-doped supporting elements for the large hollow cores are also described, which complicated the spinning of the MOFs discussed above. We also provide the results of the tests performed for the pilot samples—designed and manufactured using the untwisted and twisted MOFs described above—which were characterized by an outer diameter of 65 µm, a hollow ring core with an inner diameter of 30.5 µm, under a wall thickness of 1.7 µm, and a refractive index difference of Δn = 0.030. Moreover, their geometrical parameters, basic transmission characteristics, and the measurements of the far-field laser beam profile patterns are also provided.

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Section: Introductionmentioning

confidence: 99%

Twisted Silica Few-Mode Hollow GeO2-Doped Ring-Core Microstructured Optical Fiber

et al. 2023

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“…And the combination of the fiber and the vortex beam can not only improve the performance of the fiber, but also expand the application of the fiber. Generally, the difference in effective refractive index between vector modes in fiber is too small, the modes will occur crosstalk and merging each other during propagation to form a linearly polarization (LP) mode, and the OAM mode cannot be transmitted stably in such waveguides [4]. In summary, it is particularly pivotal to design a fiber that can support multiple OAM modes, and ensure the stable transmission of vortex beams in fiber.…”

Section: Introductionmentioning

confidence: 99%

Design of Photonic Crystal Fiber Capable of Carrying Multiple Orbital Angular Momentum Modes Transmission

Ke¹,

Wang²

2020

OPJ

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For the traditional photonic crystal fibers with circular air holes, rectangular air holes are added to the fiber cladding. The periodic arrangement of the inner rectangular air holes allows the fiber structure to better match the annular mode field distribution of the vortex beam. The fiber structure was analyzed and calculated by COMSOL Multiphysics 5.4 finite element software, and the characteristics of fiber were analyzed, such as the dispersion, confinement loss, effective mode area and nonlinear coefficient. The results reveal that the photonic crystal fiber structure capable of carrying 50 orbital angular momentum (OAM) modes at the wavelength of 1.15 to 2.0 μm (850 nm). The effective refractive index difference Δn eff between vector modes can reach 1 × 10 −3 , and larger difference can effectively separate the vector modes and improve the transmission performance of OAM modes. Moreover, the fiber has good performance, such as flat dispersion distribution of the low-order modes, low confinement loss below 10 −9 dB•m −1 , large effective mode field area and small nonlinear coefficient in the 850 nm wavelength range. Therefore, this fiber structure can be applied to the high-capacity communication system of fiber multiplexing OAM. In addition, the good characteristics of this fiber structure are of great significance for the transmission of vortex beam in fiber.

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Twisted Silica Few-Mode Hollow GeO<sub>2</sub>-Doped Ring Core Microstructured Optical Fiber

Bourdine¹,

Demidov²,

Ter-Nersesyants³

et al. 2023

Preprint

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This work presents first time successfully fabricated silica few-mode microstructured optical fiber (MOF) with hollow GeO2-doped ring core and strongly induced twisting up to 790 revolutions per meter. Some technological issues for manufacturing of GeO2-doped supporting elements for large hollow cores as well as described above complicated spun MOFs are discussed. We introduce some results of tests, performed for pilot samples of designed and manufactured described above untwisted and twisted MOFs with outer diameter 65 µm and hollow ring core inner diameter 30.5 µm under wall thickness 1.7 µm and refractive index difference n=0.030, including their geometrical parameters, basic transmission characteristics and measurements of far-field laser beam profile patterns.

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Transmission of Orbital Angular Momentum Modes in Grapefruit-Type Microstructure Fiber

Cited by 4 publications

References 0 publications

Twisted Silica Few-Mode Hollow GeO2-Doped Ring-Core Microstructured Optical Fiber

Twisted Silica Few-Mode Hollow GeO2-Doped Ring-Core Microstructured Optical Fiber

Design of Photonic Crystal Fiber Capable of Carrying Multiple Orbital Angular Momentum Modes Transmission

Twisted Silica Few-Mode Hollow GeO<sub>2</sub>-Doped Ring Core Microstructured Optical Fiber

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