Inverse-raised-cosine fibers for next-generation orbital angular momentum systems

Rjeb, Alaaeddine; Guerra, Gianluca; Issa, Khaled; Fathallah, Habib; Chebaane, Saleh; Machhout, Mohsen; Palmieri, Luca; Galtarossa, Andrea

doi:10.1016/j.optcom.2019.124736

Cited by 19 publications

(8 citation statements)

References 21 publications

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“…The refractive index of IRCF is shown in the Figure 13. The IRC profile is practically thinner (or more concentrated around the fiber axis) than the IPGI profile [73]. However, it is worthy to note that our profile becomes much smoother when reaching the maximum index value n 1 .…”

Section: Inverse Raised Cosine Few Mode Fibers (Irc-fmfs)mentioning

confidence: 63%

“…Moreover, RCF is used in the same context because it eliminates intersymbol interference [72]. The IRCF profile is given by the following expression [73]:…”

Section: Inverse Raised Cosine Few Mode Fibers (Irc-fmfs)mentioning

confidence: 99%

“…The enhanced separation is likely to hinder mode coupling, reducing the system crosstalk and improving the transmission. Moreover, IRC-FMF has the potential to handle OAM modes with high purity hence low intrinsic crosstalk [73,74].…”

Section: Inverse Raised Cosine Few Mode Fibers (Irc-fmfs)mentioning

confidence: 99%

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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: Inverse Raised Cosine Few Mode Fibers (Irc-fmfs)mentioning

confidence: 63%

“…Moreover, RCF is used in the same context because it eliminates intersymbol interference [72]. The IRCF profile is given by the following expression [73]:…”

Section: Inverse Raised Cosine Few Mode Fibers (Irc-fmfs)mentioning

confidence: 99%

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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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“…core & cladding radii). By harnessing the cited opto-geometrical features flexibility, specialty optical fibers have been proposed, designed, and prototyped in order to appropriately handle vortex modes with robust performance metrics [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. These metrics include the high number of supported modes, the high intermodal separation among their effective index, the high OAM mode purities, and the low dispersions (i.e.…”

Section: Introductionmentioning

confidence: 99%

Reciprocal Inverse Graded Index Fiber (R-IGIF) for OAM-SDM Networks

et al. 2022

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In this work, we propose, design, and numerically assess a novel parametric refractive index profile for optical fiber, which we refer to as reciprocal-inverse graded index fiber (R-IGIF). The R-IGIF features a shape parameter α that controls the refractive index behavior (i.e. concave vs convex). We performed a systematic scanning of parameters' effects; using finite element method (FEM) in Comsol Multiphysics, in order to design R-IGIFs that handle robust OAM channels (i.e. low radial modes). The designed fibers possess high inter-channels separation (∆n ef f ≥1×10 -4 ) that outperforms standard step index fiber (SIF) and inverse parabolic graded index fiber (IPGIF); hence, reduces channels crosstalk. Numerical simulations show that the supported orbital angular momentum (OAM) modes are of high purity (≥ 99.9%), enabling low-level intrinsic crosstalk (≤ −30dB). Further investigations considered metrics over the C and L ITU-T bands including the cut-offs wavelengths, chromatic dispersion, differential group delay, effective area, and nonlinearity coefficient. Results show potential capability to achieve stable data channels transmission. Further assessments have been carried out under practical condition (i.e. bending) by evaluating the ∆n ef f , the intra-mode walk-offs, and the confinement loss. The findings show great resilience to bending effects. Therefore, based on these deep physical investigations of modes carrying data, the R-IGIF could find application in next generation space division multiplexing SDM-Networks.

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“…In MDM systems, the transmission capacity is enhanced by capitalizing Eigen mode dimension of the laser beam for parallel transportation of multiple information streams. Rjeb et al reported the development and performance investigation of MDM of orbital angular momentum (OAM) beams with the vortex of order l ± 2 in a few mode fiber based on inverse raised cosine function for improved performance [32]. Rusch et al explored the transmission of three quadrature PSK modulated OAM beam with l 0, −1, and + 1 over the 1.4 km ring core fiber with minimum crosstalk using 2 × 2 MIMO processor [33].…”

mentioning

confidence: 99%

Enhanced Performance of the 4 × 20 Gbit/s-40 GHz OFDM-Based RoFSO Transmission Link Incorporating WDM-MDM of Hermite Gaussian and Laguerre Gaussian Modes

Singh¹,

Singh

Grover³

et al. 2022

Front. Phys.

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A 4 × 20 Gbit/s-40 GHz orthogonal frequency-division multiplexing-based radio-on-free-space optics information link, integrating hybrid wavelength- and mode-division multiplexed transmission techniques, is proposed in this paper. Furthermore, an ameliorated detection scheme deploying a square root module after each photo diode at the receiver terminal is proposed to mitigate the adverse performance effects because of nonlinear photodiode characteristics. The presented results show a successful 80 Gbit/s-160 GHz transmission at 3000 and 2700 m under heavy rainy and foggy weather, respectively. The link demonstrates superior performance in terms of maximum range and transmission rate compared to previous works.

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Inverse-raised-cosine fibers for next-generation orbital angular momentum systems

Cited by 19 publications

References 21 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

Reciprocal Inverse Graded Index Fiber (R-IGIF) for OAM-SDM Networks

Enhanced Performance of the 4 × 20 Gbit/s-40 GHz OFDM-Based RoFSO Transmission Link Incorporating WDM-MDM of Hermite Gaussian and Laguerre Gaussian Modes

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