Few-mode fibers with improved mode spacing

May, Alexander R.; Zervas, M.N.

doi:10.1109/ecoc.2015.7341706

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…These changes will inevitably yield high fiber nonlinearities, large attenuation, and severe modal birefringence [8]. A more effective approach is adopting perturbed ring areas in the fiber core to adjust the n eff of all LP modes to approach equal spacing as much as possible [9,10]. The second modal crosstalk is the intra-LP-mode crosstalk between each pair of degenerate modes (LP lma and LP lmb , l ≥ 1).…”

Section: Introductionmentioning

confidence: 99%

All-Fiber Low-Modal-Crosstalk Demultiplexers for DSP-Free IM/DD LP-Mode MDM Transmission

Gao,

Cui,

Zhou

et al. 2024

Photonics

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Weakly coupled mode-division multiplexing (MDM) techniques supporting intensity modulation and direct detection (IM/DD) transmission are promising methods of enhancing the capacity of short-reach scenarios in which low-modal-crosstalk-mode demultiplexers for degenerate linear polarized (LP) modes are highly desired. In this paper, we review two degenerate-mode reception schemes. Firstly, a low-modal-crosstalk orthogonal combined reception method for degenerate modes is proposed based on all-fiber mode-selective couplers, in which signals in both degenerate modes are demultiplexed into the LP01 mode of single-mode fibers and then are multiplexed into the mutually orthogonal LP01 and LP11 modes of a two-mode fiber (TMF) for simultaneous detection. Secondly, a novel degenerate-mode-selective coupler consisting of an input few-mode fiber and an output TMF is proposed, which could demultiplex degenerate LP modes without any digital signal processing (DSP). Both demultiplexers are achieved based on the taper and polish process. The fabricated devices are characterized and compared. The results show that the proposed schemes can pave the way to the practical implementation of DSP-free IM/DD LP-mode MDM transmission systems.

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Section: Introductionmentioning

confidence: 99%

All-Fiber Low-Modal-Crosstalk Demultiplexers for DSP-Free IM/DD LP-Mode MDM Transmission

Gao,

Cui,

Zhou

et al. 2024

Photonics

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“…designed and fabricated a ring-assisted four-mode optical fiber with minΔn eff of 1.8×10 -3 [17]. R. M. Alexander et al proposed an optical fiber of a depressed core and four high-index side holes, which increased the minΔn eff of 4 modes from 0.8×10 -3 to 1.2×10 -3 without significantly affecting other characteristics [18].…”

Section: Introductionmentioning

confidence: 99%

A Weakly-Coupled Few-Mode Optical Fiber With a Graded Concave High-Index-Ring

et al. 2021

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This paper proposes a novel refractive index profile design based on few-mode fibers (FMFs) which can support 4 linear polarization (LP) modes. We first present a FMF whose core is dually assisted by a nano-hole (NH) and a high-index-ring (HIR), and then substitute the dual assistance by an innovative graded concave HIR (GC-HIR) assisted structure. Using the finite element method (FEM), the parameters of the NH-HIR and GC-HIR optical fiber are adjusted to investigate their respective minimum effective refractive index difference (minΔneff), which is 2.012×10-3 for the former, and 2.532×10-3 for the latter. Both optical fibers have a significant improvement on the crosstalk suppression effect, and the GC-HIR optical fiber is even better. The proposed GC-HIR FMF with special refractive index profile has potential application prospects in mode division multiplexing (MDM) optical fiber communication system, and can provide theoretical foundation for the design and analysis of subsequent optical fibers and key components.

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“…In [49], the mode spacing was designed such that one mode from each of the five nondegenereate mode groups was excited from a customized few mode fiber so as to minimize crosstalk [49]. In [50], mode spacing of a few mode fiber was achieved by rotationally symmetric refractive index perturbations inside the core for varying the sub-group and rotationally nonsymmetric refractive index perturbations in the cladding for varying individual modes. On the other hand, [51] proved experimentally and numerically that the use of a basis set containing optical vortices does not increase the number of degrees of freedom in an optical system.…”

Section: Contributionmentioning

confidence: 99%

Laguerre-Gaussian mode division multiplexing in multimode fiber using SLMs in VCSEL arrays

Amphawan

Fazea

2016

J. Eur. Opt. Soc.-Rapid Publ.

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Mode division multiplexing (MDM) is a promising technology for increasing the aggregate bandwidth of multimode fiber (MMF) in conjunction with wavelength division multiplexing (WDM) in face of the impending capacity crunch in optical fiber networks. This paper investigates the effect of radial and azimuthal mode spacings in a 25-channel MDM-WDM system in MMF using a spatial light modulator-controlled VCSEL array for excitation of Laguerre-Gaussian (LG) modes. A data rate of 25Gbps is achieved at a central wavelength of 1550.12 nm. The effects of different azimuthal and radial mode spacings of LG modes are analyzed in terms of the channel impulse response, eye diagram and bit-error rate.

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Few-mode fibers with improved mode spacing

Cited by 12 publications

References 6 publications

All-Fiber Low-Modal-Crosstalk Demultiplexers for DSP-Free IM/DD LP-Mode MDM Transmission

All-Fiber Low-Modal-Crosstalk Demultiplexers for DSP-Free IM/DD LP-Mode MDM Transmission

A Weakly-Coupled Few-Mode Optical Fiber With a Graded Concave High-Index-Ring

Laguerre-Gaussian mode division multiplexing in multimode fiber using SLMs in VCSEL arrays

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