Cascaded Mode-Division-Multiplexing and Time-Division-Multiplexing Passive Optical Network Based on Low Mode-Crosstalk FMF and Mode MUX/DEMUX

Ren, Fang; Li, Juhao; Hu, Tao; Tang, Ruizhi; Yu, Jinyi; Mo, Qi; He, Yongqi; Li, Zhengbin

doi:10.1109/jphot.2015.2470098

Cited by 56 publications

(9 citation statements)

References 25 publications

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“…So this scheme has very high requirements for ultralow-modalcrosstalk FMFs and high-selectivity mode exciters. We have experimentally demonstrated 55-km weakly-coupled two-mode fiber (TMF) transmission [20], which makes the proposed scheme possible. We theoretically analyze the relationship between mode coupling and transverse stress and experimentally demonstrate a proof-of-concept DTSS system for a two-mode case.…”

Section: Introductionmentioning

confidence: 99%

Distributed Transverse Stress Sensor Based on Mode Coupling in Weakly-Coupled FMF

et al. 2022

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Distributed optical fiber sensors (DOFSs) have faced the challenge of measuring transverse stress along the fiber and the current main approach has been based on polarization coupling effect in polarization-maintaining fibers (PMFs), which has short sensing length and high dependence on direction of exerted stress. Instead, here we propose a novel distributed transverse stress sensor (DTSS) based on coupling effect between linearly-polarized (LP) modes in weakly-coupled few-mode-fibers (FMFs). In this scheme, multiple LP modes could be considered as independent spatial channels without stress perturbation because of ultralow inherent modal crosstalk, while quantifiable and spatially-resolvable mode coupling for a probe signal will occur under transverse stress satisfying phase-matching conditions. A proof-of-concept DTSS system is verified based on weakly-coupled two-mode fibers and mode-selective couplers for mode conversion. Moreover, we show that the scheme is little affected by mild common parameters including temperature, strain, twist, direction of stress, or state-of-polarization (SOP), which is crucial for accurate stress analysis under complex environmental conditions. The proposed DTSS scheme has simple structure, high flexibility for different sensing ranges and resolutions, and high collaborating capability with other sensing mechanisms.

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Section: Introductionmentioning

confidence: 99%

Distributed Transverse Stress Sensor Based on Mode Coupling in Weakly-Coupled FMF

et al. 2022

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“…However, the computational complexity and cost for strongly-coupled approaches will increase drastically with longer fiber length and more modes, which prevents the real-time hardware implementation of MIMO receiver [4]. Nowadays, weakly-coupled MDM approaches have attracted much interest [5], [6], in which the modal crosstalk for FMFs, optical components and their connections are significantly suppressed so that each mode can be independently received without MIMO processing. Some weakly-coupled FMF designs with simple structures have been proposed such as step-index circular-core (SI-CC) FMF with high index difference between fiber core and cladding [7], however, it's hard for them to be extended to support more independent modes.…”

Section: Introductionmentioning

confidence: 99%

Multiple-Ring-Core FM-EDF for Weakly-Coupled MDM Amplification With Low Differential Modal Gain

et al. 2021

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Recently weakly-coupled mode-division multiplexing (MDM) transmission systems and networks based on ultralow-modal-crosstalk few-mode fiber (FMF) have attracted much interest, for which optical amplification technologies with low modal crosstalk and twodimension mode-wavelength gain flattening are highly desired. In this paper, we propose for the first time a design method for few-mode Erbium-doped fiber (FM-EDF) with multiring-core (MRC) structures of both index and Erbium doping, which has high compatibility with the transmission MRC-FMF and low differential modal gain (DMG) with simple pump injection requirement. By sharing the boundaries of ring areas for both index and Erbium doping, the design method also helps to reduce the complexity of preform fabrication. We show by simulation that at 1550-nm signal wavelength, a 6-mode MRC-EDF can achieve a minimum DMG of 0.35-dB with only LP 11 pump light injection and a 10-mode MRC-EDF can achieve a minimum DMG of 0.60-dB with LP 01 and LP 03 pump lights injection. Besides, the tolerance of DMG to the variation of fiber parameters induced by fabrication is analyzed. The proposed FM-EDF is beneficial for the practical applications of weakly-coupled MDM transmission systems and networks.

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“…In 2006, ethernet PON (EPON) and gigabit PON (GPON) were extensively deployed. [1][2][3] The primary point-to-multipoint PON architectures comprise the usage of time-division-multiplexing (TDM) or wavelength-division-multiplexing (WDM) techniques. [4][5][6] Then the deployment of next-generation PON stage-1 (NG-PON1), that is, 10GPON and 10EPON with higher bandwidth capacity has come into a significant stage.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of long‐reach 40/40 Gbps mode division multiplexing‐based hybrid time and wavelength division multiplexing passive optical network/free‐space optics using Gamma‐Gamma fading model with pointing error under different weather conditions

Kumari

Sharma

Sheetal

2021

Trans Emerging Tel Tech

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Time and wavelength division multiplexing passive optical network (TWDM-PON) is adopted across the globe and is considered as the most remarkable trend of the next-generation solution to serve exponential traffic growth for fifth-generation (5G) network. In the interest of achieving 5G network requirements, we propose a mode division multiplexing (MDM) based bidirectional 40/40 Gbps hybrid TWDM-PON and free-space optics (FSO) system. The system performance is analyzed for bidirectional hybrid fiber/FSO channels incorporating four distinct Laguerre-Gaussian (LG00, LG01, LG11, and LG21) spatial modes for variable fiber (10-155 km)/FSO (10-1000 m) link ranges and different receiver aperture diameters (20 μm-60 cm). Based on Gamma-Gamma (GG) modeled FSO channels using Laguerre Gaussian modes, bit error rate (BER) performance of the system is numerically investigated under the impact of dynamic atmospheric weather conditions, weak-to-strong turbulence conditions, pointing errors, and geometric loss (GL) at an acceptable BER of 10 −9. In addition, to support the numerical analysis, the simulation results exhibit that the hybrid fiber/FSO LG00 signals over 1000 m FSO and 155 km fiber link ranges are successfully transmitted in the system with 40 μm spatial and 60 cm FSO receiver aperture diameters under the impact of strong turbulence, atmospheric attenuation of 0.2 dB/km and noise. Moreover, the performance comparison of the MDM-based hybrid TWDM-PON/FSO with the previous latest literature works reveals a superior system performance under practical environment conditions. The proposed work can be utilized to realize longreach, bandwidth-efficient, high-capacity, and high-speed data transmission links.

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Cascaded Mode-Division-Multiplexing and Time-Division-Multiplexing Passive Optical Network Based on Low Mode-Crosstalk FMF and Mode MUX/DEMUX

Cited by 56 publications

References 25 publications

Distributed Transverse Stress Sensor Based on Mode Coupling in Weakly-Coupled FMF

Distributed Transverse Stress Sensor Based on Mode Coupling in Weakly-Coupled FMF

Multiple-Ring-Core FM-EDF for Weakly-Coupled MDM Amplification With Low Differential Modal Gain

Performance analysis of long‐reach 40/40 Gbps mode division multiplexing‐based hybrid time and wavelength division multiplexing passive optical network/free‐space optics using Gamma‐Gamma fading model with pointing error under different weather conditions

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