10 Gbps CPRI signals transmission impaired by intercore crosstalk in 5G network fronthauls with multicore fibers

Rebola, Joao L.; Cartaxo, Adolfo V. T.; Marques, André S.

doi:10.1007/s11107-019-00828-0

Cited by 6 publications

(28 citation statements)

References 35 publications

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“…- Furthermore, for 80 km and OP = 10 −4 , a higher tolerance to ICXT exceeding 8.1 dB is observed for high SSRP in comparison with low SSRP. A similar higher tolerance to ICXT for high SSRP has been found in other works [22,25]. For |S mn •R s | = 1000, several hundreds of PAM4 symbols in the interfering core contribute to ICXT, which induces a "noise"-like behavior on the signal received in the CUT, and reduces the ICXT impact.…”

Section: Op Dependence On the Mcf Lengthsupporting

confidence: 78%

“…The electrical and optical receiver filters bandwidth were optimized in back-toback operation to maximize the receiver sensitivity. Then, for each link length, the signal power at the transmitter output has been set to achieve the BER of 3.8 × 10 −5 in the absence of ICXT, which is two orders of magnitude below the BER limit in the presence of ICXT, similarly to what has been done in [22]. We consider a BER limit of 3.8 × 10 −3 in the presence of ICXT, since it is the most common BER limit used for datacenters connections with forward-error correction [30,47].…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The ICXT impact on the OOK system performance has been assessed by comparing experimental and simulated BERs and OPs in weakly-coupled MCFs [19] and by comparison with theoretical results [20]. The dependence of the OP due to ICXT on several parameters and features of OOK systems, such as the laser linewidth [21], skew-symbol rate product [21,22], and ICXT level [19,22] has been studied. The impact of ICXT on the performance of PAM4 IM-DD systems has also been assessed [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections

2021

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In this work, we propose to use four-level pulse amplitude modulation (PAM4) and multi-core fibers (MCFs) to support very high capacity datacenter interconnect (DCI) links. The limitations imposed by inter-core crosstalk (ICXT) on the performance of 112 Gb/s up to 80 km-long optically amplified PAM4 inter-DCI links with intensity-modulation and direct-detection and full chromatic dispersion compensation in the optical domain are analyzed through numerical simulation for high and low skew-symbol rate product (SSRP). With only one interfering core, we show that those PAM4 inter-DCI links achieve an outage probability (OP) of 10−4 with a maximum ICXT level of −13.9 dB for high SSRP and require an ICXT level reduction of about 8.1 dB to achieve the same OP for low SSRP. Due to using full dispersion compensation, for an OP of 10−4, the maximum acceptable ICXT level shows only a 1.4 dB variation with the MCF length increase from 10 km to 80 km. When considering the ICXT induced by several interfering cores, the maximum ICXT level per interfering core for an OP of 10−4 decreases around 3 dB when doubling the number of interfering cores. This conclusion holds for high and low SSRP regimes. For two interfering cores, we show that a single interfering core with low SSRP is enough to induce a severe reduction of the maximum acceptable ICXT level.

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Section: Op Dependence On the Mcf Lengthsupporting

confidence: 78%

Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections

2021

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“…This filtering models the frequency limitations due to the electrical part of the PAM4 transmitter. The PAM2 signal in the interfering core is generated as described in (Rebola et al, 2019c).…”

Section: Pam4 Signal Characterizationmentioning

confidence: 99%

“…In this work, the impact of ICXT on the performance of PAM4 transmission in intradatacenter links impaired by PAM2 transmission in the interfering cores is analyzed through several metrics, such as BER, eye-pattern analysis and outage probability (OP). This scenario will probably be encountered in the upgrade of a future existing intradatacenter link with PAM2 transmission in all cores of the MCF (Rebola et al, 2019c) to support PAM4 transmission in some cores.…”

Section: Introductionmentioning

confidence: 99%

Transmission of PAM4 Signals in ICXT-impaired Intra-datacenter Connections with PAM2 Signal Interference

Jorge

Rebola

Cartaxo

2020

Proceedings of the 8th International Conference on Photonics, Optics and Laser Technology

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Traffic in datacenters has been significantly increasing over the last few years. As a result, it is necessary to scale the connections of the datacenters to accommodate such an increase of traffic. The solution considered in this work is to use four-level pulse amplitude modulation (PAM4) and weakly-coupled multicore fibers (MCFs) to support intra-datacenter connections. However, transmission in weakly-coupled MCFs may be significantly degraded by inter-core crosstalk (ICXT). In this work, the impact of ICXT on the performance of PAM4 transmission in short-haul direct-detection links is evaluated considering two-level PAM (PAM2) signals in the interfering cores. The ICXT impact on the performance of the tested core with PAM4 transmission is evaluated using the bit error rate (BER), outage probability (OP) and eye-pattern analysis. Comparing to PAM2 transmission in the tested core, a 7.6 dB lower ICXT level is required to achieve an acceptable OP for a reference BER of 3.8×10 −3 in the PAM4 link.

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Assessment of the Combined Effect of Laser Phase Noise and Intercore Crosstalk on the Outage Probability of DD OOK Systems

Rebola

Alves

Cartaxo

2019

2019 21st International Conference on Transparent Optical Networks (ICTON)

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We study the influence of the combined effect of laser phase noise and intercore crosstalk on the outage probability of direct-detection 10 Gbit/s on-off keying optical communication systems. We show that the laser phase noise can affect significantly the outage probability, for lasers with linewidths in the MHz range, for low and high skew-bit rate products. We also show that the laser phase noise effect on the received eye-pattern is qualitatively similar to the one found for high skew-bit rate product in the absence of laser phase noise.

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10 Gbps CPRI signals transmission impaired by intercore crosstalk in 5G network fronthauls with multicore fibers

Cited by 6 publications

References 35 publications

Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections

Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections

Transmission of PAM4 Signals in ICXT-impaired Intra-datacenter Connections with PAM2 Signal Interference

Assessment of the Combined Effect of Laser Phase Noise and Intercore Crosstalk on the Outage Probability of DD OOK Systems

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