Ring-based coil structure photonic crystal fiber for transmission of Orbital Angular Momentum with large bandwidth: Outline, investigation and analysis

Israk, Md. Farhan; Razzak, Md. Abdur; Ahmed, Kawsar; Hassan, Md. Mehedi; Kabir, Md. Anowar; Hossain, Md. Nadim; Paul, Bikash Kumar; Dhasarathan, Vigneswaran

doi:10.1016/j.optcom.2020.126003

Cited by 44 publications

(16 citation statements)

References 39 publications

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“…Higher mode quality indicates that the energy of the electric field can be better confined in the core or ring. 16 Mode quality is calculated by using the following Eq. ( 4):…”

Section: Characteristic Analysis and Resultsmentioning

confidence: 99%

Hybrid-structured photonic crystal fiber for propagating vortex beams by multiple-core channels

Wang,

Yu,

et al. 2023

Opt. Eng.

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.Photonic crystal fibers (PCFs) have been extensively studied to enhance communication capacity and spectral efficiency by supporting orbital angular momentum (OAM) modes. However, the structural fragility resulting from the central air hole in PCFs undermines the fiber’s roundness. We introduce a hybrid PCF that replaces the central air hole with a material with a high refractive index. This innovation not only enhances the fiber’s structural strength but also introduces an additional communication channel. Furthermore, this method increases the amount of OAM modes supported for transmission in the ring. Numerical results demonstrate that significant differences in refractive indices exist between adjacent vector modes, with high mode quality (ranging from 74.6% to 97.6%) and a small effective mode area (ranging from 23.5 to 59.5 μm2). The proposed hybrid PCF can transmit 20 OAM modes in the inner core and 54 OAM modes in the outer ring. The spacing between the two layers of air holes has a minimal impact on the effective mode area and mode quality. However, the effective mode area decreases and the mode quality increases with the enlargement of the diameter of air holes. In addition, a decrease in doping concentration results in lower mode quality and a larger effective mode area. Moreover, the proposed hybrid PCF can be employed in OAM-based mode division multiplexing for high-capacity short-range fiber optic communication.

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“…Higher mode quality indicates that the energy of the electric field can be better confined in the core or ring. 16 Mode quality is calculated by using the following Eq. ( 4):…”

Section: Characteristic Analysis and Resultsmentioning

confidence: 99%

Hybrid-structured photonic crystal fiber for propagating vortex beams by multiple-core channels

Wang,

Yu,

et al. 2023

Opt. Eng.

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“…When the frequency exceeds 0.45 THz, the proposed terahertz OAM PCF reaches the maximum power fraction 99%. Mode purity represents the quality of OAM mode, which is evaluated by the light intensity overlap between the target mode and the total mode of PCF as below [28,29] Here, E is the electric field vector. The change in the mode purity of all vector modes supported by the proposed terahertz OAM PCF with frequency ranging from 0.20 THz to 0.55 THz is shown in Figure 13.…”

Section: Properties Of the Designed Terahertz Oam Pcfmentioning

confidence: 99%

“…In the optical fiber communication system, high mode purity ensures better mode multiplexing and de-multiplexing as well as stable transmission of optical signals. Mode purity represents the quality of OAM mode, which is evaluated by the light intensity overlap between the target mode and the total mode of PCF as below [28,29]:…”

Section: Properties Of the Designed Terahertz Oam Pcfmentioning

confidence: 99%

Design for Terahertz Circular-Core Photonic Crystal Fiber Supporting Orbital Angular Momentum Modes

Yang

2022

Photonics

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We propose a new terahertz fiber based on a circular-core photonic crystal fiber (PCF) structure to support high-performance orbital angular momentum (OAM) modes transmission. The modal characteristics of the proposed terahertz fiber were thoroughly analyzed to vary the parameters of air holes radius and the annular thickness by the full-vector finite element method (FEM). The optimal parameters are selected to realize the stable transmission of five-order OAM mode with high mode quality, low confinement loss and wide bandwidth. The mode purity is in excess of 91%, and the confinement loss is less than 10−7 dB/m over the 0.2 THz to 0.55 THz band. Furthermore, the design of this PCF is relatively simple and flexible, since it consists only of circular air holes. Due to its excellent transmission characteristics, the proposed OAM fiber has a potential application in terahertz mode division multiplexing (MDM) communication system.

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“…The proposed PCF supports two OAM modes, but there are problems include a small number of supported modes and large loss. Later, different structures of PCFs, such as circular air holes PCF [40][41][42][43][44][45][46][47][48], rectangular air holes PCF [49], and hybrid air hole PCF [50,51], were proposed in some studies, and the performance of the fiber was optimized by changing the position and size of the air holes.…”

Section: Photonic Crystal Fibermentioning

confidence: 99%

“…In some studies, the properties of the circular air hole PCF were changed by changing the position and size of holes [42][43][44], as shown in Figures 4A,B. Nandam et al [46] proposed a PCF with spiral-shaped air holes and could support 14 OAM modes.…”

Section: Photonic Crystal Fibermentioning

confidence: 99%

Generation, Transmission and Application of Orbital Angular Momentum in Optical Fiber: A Review

Lian

Wang

et al. 2021

Front. Phys.

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Optical orbital angular momentum (OAM) has become a hot research topic because of its unique properties due to its spiral distribution of phases. The production and transmission of OAM has also become a necessary condition for effective use of OAM. As an optical waveguide with good propagation properties, optical fibers are used in optical systems supporting OAM. This paper introduces the OAM generation and transmission system based on fiber, summarizes the current photonic crystal fiber, ring core fiber, fiber grating and other all-fiber systems that can support OAM modes, and explains some experimental principles. Finally, an outlook on OAM generation or transmission devices for all-fiber systems is presented, providing a useful reference for future related research.

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Ring-based coil structure photonic crystal fiber for transmission of Orbital Angular Momentum with large bandwidth: Outline, investigation and analysis

Cited by 44 publications

References 39 publications

Hybrid-structured photonic crystal fiber for propagating vortex beams by multiple-core channels

Hybrid-structured photonic crystal fiber for propagating vortex beams by multiple-core channels

Design for Terahertz Circular-Core Photonic Crystal Fiber Supporting Orbital Angular Momentum Modes

Generation, Transmission and Application of Orbital Angular Momentum in Optical Fiber: A Review

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