Linear block-coding across &amp;#x003E;5 Tb/s PDM-64QAM spatial-super-channels in a 19-core fiber

Puttnam, Benjamin J.; Luís, Ruben S.; Mendinueta, José Manuel Delgado; Awaji, Yoshinari; Wada, Naoya; Agrell, Erik

doi:10.1109/ecoc.2015.7341780

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…We note that although we are not aware of any such evaluation of these effects for QAM signals, the impact of such dynamic effects in a single span of MCF have been experimentally investigated for OFDM signals [32], where the random crosstalk-induced performance fluctuations lead to a significant decrease of the overall system performance. If such phenomena is shown to be a feature of long-distance MCF transmission, it may be that transmission schemes able to adapt to fluctuating crosstalk conditions, such as high-dimensional coded modulation formats [16], [33], [34], may become important to exploit MCF systems, but primarily this analysis serves to highlight the need for a better understanding of the impact of IC-XT in long distance MCF links.…”

Section: Impact Of Dynamic Crosstalk Characteristicsmentioning

confidence: 99%

Impact of Intercore Crosstalk on the Transmission Distance of QAM Formats in Multicore Fibers

et al. 2016

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We investigate the impact of intercore crosstalk on the achievable transmission distance of three square quadrature amplitude modulation (QAM) formats. We show that increasing intercore crosstalk across an 18 dB range starting from −43.4 dB/100 km reduces the achievable transmission distance for all formats, with a greater impact on higher order modulation formats. For a crosstalk level arising from equal signal launch power in each core of a homogeneous 7-core fiber, we measure a reduced transmission distance at BER ¼ 1:5 Â 10 À2 of 24%, 38% and 54%, for polarization-division-multiplexed-quadrature phase-shift keying (PDM-QPSK), PDM-16QAM, and PDM-64QAM, respectively. Finally, we investigate the potential impact that dynamic crosstalk variation could have in transmission systems based on multicore fiber and estimate the achievable reach for an outage probability of 1 Â 10 À5 in the presence of dynamically varying intercore crosstalk.

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Section: Impact Of Dynamic Crosstalk Characteristicsmentioning

confidence: 99%

Impact of Intercore Crosstalk on the Transmission Distance of QAM Formats in Multicore Fibers

et al. 2016

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“…This can be used to increase the sensitivity of modulation formats and FEC can be redistributed and shared among the channels. This could be exploited to allow for very long codes to be used without suffering from increased waiting time, similar to coding over multiple spatial dimensions [51], or to allow for interleaving within the superchannel to reduce its time memory, to mention two examples.…”

Section: Discussionmentioning

confidence: 99%

Joint Superchannel Digital Signal Processing for Ultimate Bandwidth Utilization

Mazur¹,

Schröder²,

Karlsson³

et al. 2019

Preprint

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Modern optical communication systems transmit multiple frequency channels, each operating very close to its theoretical limit. The total bandwidth can reach 10 THz limited by the optical amplifiers. Maximizing spectral efficiency, the throughput per bandwidth is thus crucial. Replacing independent lasers with an optical frequency comb can enable very dense packing by overcoming relative drifts. However, to date, interference from non-ideal spectral shaping prevents exploiting the full potential of frequency combs. Here, we demonstrate combenabled multi-channel digital signal processing, which overcomes these limitations. Each channel is detected using an independent coherent receiver and processed at two samples-per-symbol. By accounting for the unique comb stability and exploiting aliasing in the design of the dynamic equalizer, we show that the optimal spectral shape changes, resulting in a higher signal to noise ratio that pushes the optimal symbol rate towards and even above the channel spacing, resulting in the first example of frequencydomain super-Nyquist transmission with multi-channel detection for optical systems. The scheme is verified both in back-to-back configuration and in single span transmission of a 21 channel superchannel originating from a 25 GHz-spaced frequency comb. By jointly processing 3 wavelength channels at a time, we achieve spectral efficiency beyond what is possible with independent channels. At the same time, one significantly relaxes the hardware requirements on digital-to-analog resolution and bandwidth, and well as filter tap numbers. Our results show that comb-enabled multi-channel processing can overcome the limitations of classical dense wavelength division multiplexing systems by enabling tighter spacing to reach the ultimate spectral efficiency in optical communications.

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“…Furthermore, the drive to gain more efficiency from SDM technology and the need to compensate for imperfect properties of the optical channels has led to various approaches for incorporating elements of coding into the SDM transmission system. Multi-dimensional modulation formats based on short linear block codes (LBCs) in up to 24 dimensions was studied in [46] and experimental investigation of SSCs with LBCs of hundreds of bits [56] are described in the next section.…”

Section: ) Spatial-super Channels With Linear Block Codesmentioning

confidence: 99%

High Capacity Transmission Systems Using Homogeneous Multi-Core Fibers

Puttnam

Luís

Agrell

et al. 2017

J. Lightwave Technol.

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We discuss transmission using homogeneous, single-mode, multi-core fibers. We first describe the key fiber properties that can affect transmission, such as inter-core crosstalk and the variation of propagation delay between cores, and the consequences of these properties on spatial super-channel transmission. We then describe a series of experiments and demonstrations of system features including self-homodyne detection and joint spatial super-channel modulation before discussing their suitability to high-capacity transmission.

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Linear block-coding across >5 Tb/s PDM-64QAM spatial-super-channels in a 19-core fiber

Abstract: We apply linear block-codes across 228-bit, PDM-64QAM spatial super-channels in a 19core fiber and observe upto 3 dB reduced OSNR requirement and additional transmission reach of 55% at BER=3.8×10-3 and 122% at BER=1×10-3 for a 10.5% code overhead.

Cited by 10 publications

References 12 publications

Impact of Intercore Crosstalk on the Transmission Distance of QAM Formats in Multicore Fibers

Impact of Intercore Crosstalk on the Transmission Distance of QAM Formats in Multicore Fibers

Joint Superchannel Digital Signal Processing for Ultimate Bandwidth Utilization

High Capacity Transmission Systems Using Homogeneous Multi-Core Fibers

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