Multi-Core Fiber Technology for SDM: Coupling Mechanisms and Design

Saitoh, Kunimasa

doi:10.1109/jlt.2022.3145052

Cited by 31 publications

(6 citation statements)

References 53 publications

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“…We employed a coupled mode theory to study the mode coupling effect and SMD of the CC-4CFs [20], [21], which can be expressed as () ( ) ( )…”

Section: Fiber Design and Fabricationmentioning

confidence: 99%

Study on Characteristics of Coupled-Core Four-Core Fibers With Different Core Pitches

Xiong,

Ma,

Chang

et al. 2024

IEEE Photonics J.

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We studied the characteristics of coupled-core fourcore fibers (CC-4CFs) with different core pitches both theoretically and experimentally. The spatial mode dispersions of different fibers were analyzed, and the result agrees well with theoretical ones. In the experiment, we achieved a spatial mode dispersion as low as 3.72 ps/km 1/2 for a 4 km-long CC-4CF with core pitch of 19 μm at a bending radius of 8 cm. The impulse response matrices of four core fibers with different core pitches was investigated using swept-wavelength interferometry over 100 nm bandwidth. The impulse responses were Gaussian-shaped and consistent between different inputs and outputs for CC-4CFs. Our results show that the CC-4CFs with core pitches of 17 and 19 μm exhibit narrower pulse broadening. In addition, the modedependent losses of different fibers were analyzed. For the fibers with core pitch of 19 μm, the estimated mode-dependent loss was lower than 3 dB for the entire 100 nm bandwidth. Our results are especially helpful for developing coupled-core multicore fibers for long-haul transmission applications.

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“…We employed a coupled mode theory to study the mode coupling effect and SMD of the CC-4CFs [20], [21], which can be expressed as () ( ) ( )…”

Section: Fiber Design and Fabricationmentioning

confidence: 99%

Study on Characteristics of Coupled-Core Four-Core Fibers With Different Core Pitches

Xiong,

Ma,

Chang

et al. 2024

IEEE Photonics J.

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“…In spite of optical fiber communication systems employ various multiplexing techniques to maximize the transmission capacity and efficiency, including time division multiplexing [1], wavelength division multiplexing [2], frequency division multiplexing [3], code division multiplexing [4] and spatial division multiplexing * Author to whom any correspondence should be addressed. [5]. However, as data demands continue to grow, the capacity of SMFs is becoming limited.…”

Section: Introductionmentioning

confidence: 99%

Improving orbital angular momentum mode transmission with imperfect ring–core fiber

Wang,

Yu,

Deng

et al. 2024

J. Opt.

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Orbital Angular Momentum (OAM), inherent to light beams characterized by helical phase fronts, represents an alternative spatial degree of freedom for photons. In recent years, OAM-based communication has gained significant attention as a potential solution to increase the capacity and spectral efficiency of optical fiber communication systems. In optical fibers, OAM modes can be generated and manipulated by utilizing specialized optical components and techniques. One approach involves using specially designed optical fibers, such as ring-core fibers, which have the capability to support multiple OAM modes. In the manufacturing process, the ring fiber is hardly made perfectly, especially the doped-cores. The introduced defect breaks the symmetry of the ring-core, which has a serious impact on OAM mode transmission. Using a material with a slightly higher refractive index than the cladding to wrap the ring-core is effective in reducing impairment of defects. After numerical simulation, the proposed method improves the walk-off length by a factor of 2-40.

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“…[6] When space-division multiplexing (SDM) and wavedivision multiplexing (WDM) are combined, the transmission capacity of existing optical communication systems can be greatly expanded. SDM has three types of transmission fibers: multi-core fiber (MCF) [7][8], few-mode fiber (FMF) or multi-mode fiber (MMF) [9][10][11], and few-mode multi-core fiber (FM-MCF) [12]. For SDM systems, FMF supports several modes between SMF and MMF and can transmit over longer distances than MMF.…”

Section: Introductionmentioning

confidence: 99%

A Fast and Effective MIMO Algorithm Using CLR-RNN for Hybrid MDM and WDM Optical Communication System

Zhang,

Tan,

et al. 2024

IEEE Photonics J.

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There is an increasing demand for data with the development of the world, and various fiber optic multiplexing techniques have become an important research direction to improve transmission capacity. However, the transmitted signals are subject to great interference due to mode coupling and mode dispersion, which require multiple-input multiple-output (MIMO) digital signal processing techniques to restore the quality of the transmitted signals. In this paper, a novel MIMO detector is designed using an adaptive learning recurrent neural network and successfully implemented in a mixed wavelength-division-modedivision-multiplexing (WDM-MDM) optical transmission system, and its performance is compared with that of the forced-zero detector and the minimum-mean-square-error detector. The results show that the introduction of an adaptive machine learning model in MIMO detection for WDM-MDM optical transmission systems can significantly improve the quality of the transmitted signals and achieve better performance than other MIMO detection algorithms while maintaining a faster computational speed and a lower number of parameters.

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Multi-Core Fiber Technology for SDM: Coupling Mechanisms and Design

Cited by 31 publications

References 53 publications

Study on Characteristics of Coupled-Core Four-Core Fibers With Different Core Pitches

Study on Characteristics of Coupled-Core Four-Core Fibers With Different Core Pitches

Improving orbital angular momentum mode transmission with imperfect ring–core fiber

A Fast and Effective MIMO Algorithm Using CLR-RNN for Hybrid MDM and WDM Optical Communication System

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