A review on coupled and uncoupled multicore fibers for future ultra-high capacity optical communication

Kingsta, R. Mercy; Selvakumari, R. Shantha

doi:10.1016/j.ijleo.2019.163341

Cited by 23 publications

(6 citation statements)

References 54 publications

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“…The most important constraint in MCFs is the inter-core crosstalk (XT) caused by signal power leakage from core to its adjacent cores that is controlled by core pitch (distance between adjacent cores denoted usually as ʌ) [15]. There are in Principle, two main categories of MCF: weakly coupled MCFs (=uncoupled MCF) and strongly coupled MCFs (=coupled MCF) depending on the value of a coupling coefficient 'K' (used to characterize the intercore crosstalk) [16][17][18]. Using the socalled supermodes to carry data, the crosstalk in coupled MCF must be mitigated by complex digital signal processing algorithms, such as multiple-input multipleoutput digital signal processing (MIMO-DSP) techniques [19].…”

Section: Core Division Multiplexing (Cdm)mentioning

confidence: 99%

OAM Modes in Optical Fibers for Next Generation Space Division Multiplexing (SDM) Systems

Rjeb¹,

Fathallah²,

Machhout³

2021

Fiber Optics - Technology and Applications

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Due to the renewed demand on data bandwidth imposed by the upcoming capacity crunch, optical communication (research and industry) community has oriented their effort to space division multiplexing (SDM) and particularly to mode division multiplexing (MDM). This is based on separate/independent and orthogonal spatial modes of optical fiber as data carriers along optical fiber. Orbital Angular Momentum (OAM) is one of the variants of MDM that showed promising features including the efficient enhancement of capacity transmission from Tbit to Pbit and substantial improvement of spectral efficiency up to hundreds (bs-1 Hz-1). In this chapter, we review the potentials of harnessing SDM as a promising solution for next generation global communications systems. We focus on different SDM approaches and we address specifically the MDM (different modes in optical fiber). Finally, we highlight the recent main works and achievements that have been conducted (in last decade) in OAM-MDM over optical fibers. We focus on main R&D activities incorporating specialty fibers that have been proposed, designed and demonstrating in order to handle appropriates OAM modes.

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Section: Core Division Multiplexing (Cdm)mentioning

confidence: 99%

OAM Modes in Optical Fibers for Next Generation Space Division Multiplexing (SDM) Systems

Rjeb¹,

Fathallah²,

Machhout³

2021

Fiber Optics - Technology and Applications

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“…Multicore fibres (MCFs) are promising next-generation communication carriers owing to their space division multiplexing (SDM) characteristics [1][2][3][4] ; thus, they are widely used in high-capacity data communication 5,6 and highprecision measurements [7][8][9] . These fibres comprise multiple cores arranged in a geometrically symmetrical pattern within a single cladding to minimize inter-core crosstalk 10,11 .…”

Section: Introductionmentioning

confidence: 99%

Bessel-beam-based side-view measurement of seven-core fibre internal core distribution

Zhan,

Zhu,

Tong

et al. 2024

gxjzz

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Accurate knowledge of the internal core distribution of multicore fibres (MCFs) is essential, given their widespread application, including in fibre splicing, bundle fan-in/fan-out, mode coupling, writing gratings, and fibre drawing. However, the extensive use of MCFs is restricted by the limited methods available to precisely measure the fibre core distribution, as the measurement accuracy determines the performance of the product. In this study, a sideview and nondestructive scheme based on Bessel beam illumination was proposed for measuring the internal core distribution of a seven-core fibre. Bessel beams offer a large focal length in a scattering medium, and exhibit a unique pattern when propagating in an off-axis medium with a spatially varying refractive index. The results revealed that a long focal length and unique pattern influence the image contrast in the case of Bessel beams, which differs from a typical Gaussian beam. Further, high-precision measurement of a seven-core fibre core distribution based on a Bessel beam was demonstrated using a digital correlation method. A deep learning approach was used to improve the measurement precision to 0.2° with an accuracy of 96.8%. The proposed sideview Bessel-beam-based method has the potential to handle more complex MCFs and photonic crystal fibres.

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“…With the continuous development of wavelength-division, polarization-division, and other multiplexing technologies, the capacity of communication systems has gradually approached the Shannon limit, and researchers have tried to implement other physical dimensions of the data signal to increase the transmission capacity and improve the spectral efficiency. Spatial division multiplexing (SDM) utilizes the degree of freedom of light waves in the physical dimension of space, which can be applied in multi-core fibers, multi-mode fibers, or multi-core multi-mode fibers to further improve the transmission capacity of optical fiber communication systems [ 6 , 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Parabolic-Index Ring-Core Fiber Supporting High-Purity Orbital Angular Momentum Modes

Liu

Wang

Geng

et al. 2023

Sensors

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We design a graded-index ring-core fiber with a GeO2-doped silica ring core and SiO2 cladding. This fiber structure can inhibit the effect of spin-orbit coupling to mitigate the power transfer among different modes and eventually enhance the orbital angular momentum (OAM) mode purity. By changing the high-index ring core from the step-index to parabolic graded-index profile, the purity of the OAM1,1 mode can be improved from 86.48% to 94.43%, up by 7.95%. The proposed fiber features a flexible structure, which can meet different requirements for mode order, effective mode area, etc. Simulation results illustrate that the parabolic-index ring-core fiber is promising in enhancing the OAM mode purity, which could potentially reduce the channel crosstalk in mode-division-multiplexed optical communication systems.

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A review on coupled and uncoupled multicore fibers for future ultra-high capacity optical communication

Cited by 23 publications

References 54 publications

OAM Modes in Optical Fibers for Next Generation Space Division Multiplexing (SDM) Systems

OAM Modes in Optical Fibers for Next Generation Space Division Multiplexing (SDM) Systems

Bessel-beam-based side-view measurement of seven-core fibre internal core distribution

Parabolic-Index Ring-Core Fiber Supporting High-Purity Orbital Angular Momentum Modes

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