Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections
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...
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MDPI AG
2021-01-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/8/1/9 |
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| author | Rafael Dias João Rebola Adolfo Cartaxo |
| author_facet | Rafael Dias João Rebola Adolfo Cartaxo |
| author_sort | Rafael Dias |
| collection | DOAJ |
| description | 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 <inline-formula><math display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></semantics></math></inline-formula> 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 <inline-formula><math display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></semantics></math></inline-formula>, 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 <inline-formula><math display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></semantics></math></inline-formula> 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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| language | English |
| last_indexed | 2024-03-10T13:32:03Z |
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| spelling | doaj.art-9144765673a34493b19752d3476e0c372023-11-21T07:53:19ZengMDPI AGPhotonics2304-67322021-01-0181910.3390/photonics8010009Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter ConnectionsRafael Dias0João Rebola1Adolfo Cartaxo2Instituto Universitário de Lisboa (Iscte-iul), 1649-026 Lisboa, PortugalInstituto Universitário de Lisboa (Iscte-iul), 1649-026 Lisboa, PortugalInstituto Universitário de Lisboa (Iscte-iul), 1649-026 Lisboa, PortugalIn 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 <inline-formula><math display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></semantics></math></inline-formula> 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 <inline-formula><math display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></semantics></math></inline-formula>, 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 <inline-formula><math display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></semantics></math></inline-formula> 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.https://www.mdpi.com/2304-6732/8/1/9bit error rateinter-core crosstalkinter-datacenter connectionsmulti-core fiberoutage probabilityfour-level pulse amplitude modulation |
| spellingShingle | Rafael Dias João Rebola Adolfo Cartaxo Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections Photonics bit error rate inter-core crosstalk inter-datacenter connections multi-core fiber outage probability four-level pulse amplitude modulation |
| title | Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections |
| title_full | Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections |
| title_fullStr | Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections |
| title_full_unstemmed | Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections |
| title_short | Outage Probability Due to Crosstalk from Multiple Interfering Cores in PAM4 Inter-Datacenter Connections |
| title_sort | outage probability due to crosstalk from multiple interfering cores in pam4 inter datacenter connections |
| topic | bit error rate inter-core crosstalk inter-datacenter connections multi-core fiber outage probability four-level pulse amplitude modulation |
| url | https://www.mdpi.com/2304-6732/8/1/9 |
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