Coupled-Core Transmission over 7-Core Fiber

Ryf, Roland; Alvarado-Zacarias, Juan Carlos; Wittek, Steffen; Fontaine, Nicolas K.; Essiambre, René-Jean; Chen, Haoshuo; Amezcua‐Correa, Rodrigo; Sakuma, Hirotaka; Hayashi, Tetsuya; Hasegawa, Takemi

doi:10.1364/ofc.2019.th4b.3

Cited by 62 publications

(37 citation statements)

References 2 publications

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“…Different fiber types have been proposed for SDM, including coupled-core 5 and weakly coupled 6 single-mode multi-core fibers (MCF), few- 7 and multi-mode fibers (MMF) 8,9 , and their hybrid combinations few-mode multi-core fibers 10 . Until now, all transmission demonstrations that transmitted data rates of more than 1 peta-bit/s in a single fiber have relied on optical fibers with cladding diameters in excess of the current 125 μm standard [11][12][13][14][15][16][17][18][19] .…”

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Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

et al. 2021

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Data rates in optical fiber networks have increased exponentially over the past decades and core-networks are expected to operate in the peta-bit-per-second regime by 2030. As current single-mode fiber-based transmission systems are reaching their capacity limits, space-division multiplexing has been investigated as a means to increase the per-fiber capacity. Of all space-division multiplexing fibers proposed to date, multi-mode fibers have the highest spatial channel density, as signals traveling in orthogonal fiber modes share the same fiber-core. By combining a high mode-count multi-mode fiber with wideband wavelength-division multiplexing, we report a peta-bit-per-second class transmission demonstration in multi-mode fibers. This was enabled by combining three key technologies: a wideband optical comb-based transmitter to generate highly spectral efficient 64-quadrature-amplitude modulated signals between 1528 nm and 1610 nm wavelength, a broadband mode-multiplexer, based on multi-plane light conversion, and a 15-mode multi-mode fiber with optimized transmission characteristics for wideband operation.

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Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

et al. 2021

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“…Using the multisection model presented in [8], 12×12 matrices H are generated to simulate a strongly coupled pol-mux 6mode transmission of 100 50-km spans, yielding a total length of 5,000 km. The group delay standard deviation is set to 3.1 ps/ √ km , which is a low value for coupled core MCFs [5], [20]. The MDL/MDG of the link is controlled by a per-amplifier MDG standard deviation, σ g .…”

Section: Simulation Results For Long-haul Transmissionmentioning

confidence: 99%

DSP-based Mode-dependent Loss and Gain Estimation in Coupled SDM Transmission

Ospina

Okonkwo

Mello

2020

Optical Fiber Communication Conference (OFC) 2020

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The capacity in space division multiplexing (SDM) systems with coupled channels is fundamentally limited by mode-dependent loss (MDL) and mode-dependent gain (MDG) generated in components and amplifiers. In these systems, MDL/MDG must be accurately estimated for performance analysis and troubleshooting. Most recent demonstrations of SDM with coupled channels perform MDL/MDG estimation by digital signal processing (DSP) techniques based on the coefficients of multiple-input multiple-output (MIMO) adaptive equalizers. Although these methods provide a valid indication of the order of magnitude of the accumulated MDL/MDG over the link, MIMO equalizers are usually updated according to the minimum mean square error (MMSE) criterion, which is known to depend on the channel signal-to-noise ratio (SNR). Therefore, MDL/MDG estimation techniques based on the adaptive filter coefficients are also impaired by noise. In this paper, we model analytically the influence of the SNR on DSP-based MDL/MDG estimation, and show that the technique is prone to errors. Based on the transfer function of MIMO MMSE equalizers, and assuming a known SNR, we calculate a correction factor that improves the estimation process in moderate levels of MDL/MDG and SNR. The correction factor is validated by simulation of a 6mode long-haul transmission link, and experimentally using a 3-mode transmission link. The results confirm the limitations of the standard estimation method in scenarios of high additive noise and MDL/MDG, and indicate the correction factor as a possible solution in practical SDM scenarios.

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“…In particular, 125-m standard cladding SDM fibers are attractive for early deployment in submarine cable systems since they are expected to have high productivity and high mechanical reliability similar to existing single-mode fibers (SMFs) with the same cladding diameter [5]. Figure 1 shows the relationship between the transmission distance and the transmission capacity reported in recent standard cladding SDM fiber transmission experiments over 1,000 km [6][7][8][9][10][11][12][13][14]. To date, transoceanic distance transmissions have been reported with standard cladding uncoupled and coupled 4-core fibers [12] and coupled 7-core fibers [9]; however, the bandwidth used in these experiments is a part of the C-band and is smaller than 5 nm.…”

Section: Introductionmentioning

confidence: 99%

50.47-Tbit/s Standard Cladding Coupled 4-Core Fiber Transmission Over 9,150 km

Soma

Beppu

Wakayama

et al. 2021

J. Lightwave Technol.

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Since optical submarine cable systems are a part of the global communications infrastructure, their total capacity must be continuously and dramatically enlarged. Recently, methods how to maximize the transmission capacity under electrical power limitations have been studied, and it has been reported that a single band (C-band only) transmission system with more fiber pairs (FPs) could be a promising technology. This finding has triggered work on submarine cables with more FPs. For a further increase in FPs in optical submarine cable systems, which also have space limitations in existing cable designs, spacedivision multiplexing (SDM) technologies such as multi-core fibers (MCFs) and multi-mode fibers (MMFs) could be promising solutions. In particular, 125-m standard cladding SDM fibers are attractive for early deployment in submarine cable systems since they are expected to have high productivity and high mechanical reliability similar to existing single-mode fibers (SMFs) with the same cladding diameter. In this paper, we report transpacific MCF transmission over a 30-nm bandwidth using standard cladding ultralow-loss coupled 4-core fibers, extending our previous work. The Q 2 -factors of 608 (4 core  152 WDM) SDM/WDM channels modulated with 24-Gbaud DP (dual polarization)-QPSK (quadrature phase shift keying) exceeded the assumed forward error correction (FEC) limits after a 9,150-km transmission. As a result, transmission capacity of 50.47 Tbit/s and a capacity-distance product of 461.8 Pbit/s•km were achieved for standard cladding diameter SDM fibers.

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Coupled-Core Transmission over 7-Core Fiber

Cited by 62 publications

References 2 publications

Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

DSP-based Mode-dependent Loss and Gain Estimation in Coupled SDM Transmission

50.47-Tbit/s Standard Cladding Coupled 4-Core Fiber Transmission Over 9,150 km

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