MIMO-less Space Division Multiplexing Transmission over 1 km Elliptical Core Few Mode Fiber

Parmigiani, Francesca; Jung, Yongmin; Grüner-Nielsen, L.; Geisler, T.; Petropoulos, P.; Richardson, David J.

doi:10.1364/cleo_si.2017.sw1i.1

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…Even if the eigenmodes are selectively excited at the input end, coupling may occur as in single-mode MCFs when the propagation distance is long. In the case of short-distance propagation, however, the crosstalk may be sufficiently reduced, and a MIMO-free MDM transmission may be possible without using largely deformed elliptical core fibers [52,53,54,55].…”

Section: Discussionmentioning

confidence: 99%

“…However, we could not conclude the cause of the LP 11 mode becoming the eigenmode in this FMF. Anyway, although intentional LP mode transmission has been realized using extremely elliptical deformed core fibers [52,53,54,55,56], we discovered a new phenomenon that the LP modes propagate as the eigenmodes in a few-mode MCF with a small ellipticity [49]. This is an unpredictable phenomenon that contradicts the conventional theory [25,26].…”

Section: Four-lp-mode 12-core Fibermentioning

confidence: 92%

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Predictable and unpredictable phenomena in optical fibers for space-division/mode-division multiplexing transmission: statistical analysis of coupling and mysterious behavior of modes

Kimura

Koshiba

2020

IEICE Electron. Express

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The transmission capacity of single-mode single-core fibers is approaching the limit of about 100 Tbps owing to nonlinearity and the fiber fuse, which limit the input signal power. To avoid the so-called capacity crunch and dramatically increase the transmission capacity, a new approach utilizing space-division multiplexing (SDM) and mode-division multiplexing (MDM) has been proposed and demonstrated. In these new multiplexing technologies, a problem that is unprecedented in conventional single-mode fibers, namely, the crosstalk between transmission channels, arises. Although the input signal channels are mixed through at the output end, the signal channel can be identified using multiple-input multipleoutput (MIMO) signal processing technology at the output end. However, even using the MIMO digital signal processing technology, the problem that the computation time increases with the number of channels remains, resulting in increased latency, and so the number of channels is limited. To design a transmission system using the SDM and MDM technologies, the crosstalk should be analyzed precisely. However, the origin and behavior of crosstalk are different in SDM using multicore fibers (MCFs) and in MDM using few-mode fibers (FMFs). The behavior of crosstalk in single-mode MCFs is predictable to some extent by statistical analysis, and the system can be designed by considering the results of the analysis. On the other hand, the behavior of crosstalk of FMFs is less predictable. Since the mode launched at the input end is not the eigenmode, mode discrimination or accurate mode demultiplexing is difficult using a conventional mode demultiplexer. In addition, the eigenmode itself of FMFs is not always the hybrid mode predicted by the conventional theory but sometimes a linearly polarized (LP) mode, contradicting the conventional theory. In other words, the demultiplexed signal always involves crosstalk regardless of the transmission distance, and the quantity of crosstalk cannot be analyzed statistically. Therefore, the crosstalk and its behavior are unpredictable. In spite of these unpredictable phenomena, the signal channel can be identified using the MIMO signal processing as in single-mode MCFs. This means that the MDM technology using FMFs is established in the engineering or inductive logic sense, but still involves unexplained phenomena in the scientific or deductive logic sense. In this review, we discuss the predictable behavior of crosstalk in single-mode MCFs and also the unpredictable behavior of crosstalk in FMFs.

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Section: Discussionmentioning

confidence: 99%

Section: Four-lp-mode 12-core Fibermentioning

confidence: 92%

Predictable and unpredictable phenomena in optical fibers for space-division/mode-division multiplexing transmission: statistical analysis of coupling and mysterious behavior of modes

Kimura

Koshiba

2020

IEICE Electron. Express

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“…Future internet technology requires higher capacity, speed, and stability [1] and optical ber communication based on total re ection of light has become a pillar in the eld of optical communication [2]. In order to increase the capacity, stability, and security of optical ber communication, mode division multiplexing (MDM) [3] based on the orbital angular momentum (OAM) has become a hot research topic [4].…”

Section: Introductionmentioning

confidence: 99%

Effects of Air Holes in the Cladding of Photonic Crystal Fibers on Dispersion and Confinement Loss of Orbital Angular Momentum Modes

Shi

et al. 2021

Preprint

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In the development of orbital angular momentum (OAM) mode division multiplexing (MDM), the capacity of optical fiber communication must be improved. However, owing to dispersion and confinement loss, many OAM modes do not propagate stably over a long distance in optical fibers. In this work, the effects of the size, number, shape, number of layers, and layer spacing of air holes in the cladding of the fiber on the dispersion and confinement loss are analyzed based on a simple structure. The trends are studied and summarized to facilitate the design of optical fibers to achieve stable transmission of OAM modes over a long distance.

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Effects of air holes in the cladding of photonic crystal fibers on dispersion and confinement loss of orbital angular momentum modes

Shi

et al. 2022

Opt Quant Electron

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MIMO-less Space Division Multiplexing Transmission over 1 km Elliptical Core Few Mode Fiber

Abstract: We experimentally demonstrate 10-Gbit/s OOK MIMO-less SDM transmission over 1 km of a three-spatial-mode elliptical-core fiber at 1550 nm. Negligible power penalty is achieved thanks to the low modal crosstalk (<-22 dB) between any pair of the LP 01 , LP 11a and LP 11b modes.

Cited by 6 publications

References 5 publications

Predictable and unpredictable phenomena in optical fibers for space-division/mode-division multiplexing transmission: statistical analysis of coupling and mysterious behavior of modes

Predictable and unpredictable phenomena in optical fibers for space-division/mode-division multiplexing transmission: statistical analysis of coupling and mysterious behavior of modes

Effects of Air Holes in the Cladding of Photonic Crystal Fibers on Dispersion and Confinement Loss of Orbital Angular Momentum Modes

Effects of air holes in the cladding of photonic crystal fibers on dispersion and confinement loss of orbital angular momentum modes

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