Huawei releases Wi-Fi 6 router "HUAWEI WiFi AX3 NEW" compatible with IPoE IPv6 at 8,000 yen levelMSI Exhibits Wi-Fi 6E Gaming Wi-Fi Router at TGS 2022Regarding Ethernet or 10GBASE-T, since 2017 [10GBASE-T, finally popular?], we delivered all 11 episodes and 2 extra episodes.However, twisted pair copper wiring Ethernet is up to 10GBASE-T, and 25/40GBASE-T has not yet been put into practical use.The September meeting basically focused on updating the Project Document, including PAR and CSD.In other words, first of all, the consideration of Document is progressing smoothly.Among them, the only new story was the presentation "Feasibility study of coherent 800Gb/s for 10km & 40km" by Mr. Huijian Zhang of HiSilicon Optoelectronics.According to this, the OTT service provider seems to be very interested in 800G Coherent, and they are considering it.Now, the following is the relationship between signal speed and SNR.Green is the Shannon limit (theoretical maximum channel capacity) at 800 Gbps, blue is 1.6 Tbps, and red is the upper limit of available SNR.Therefore, the area between the red and green or red and blue curves is the range of signal speed and SNR that can be used as a practical problem.96G/192GBaud with PDM-32QAM and 120G/240GBaud with PDM-16QAM were listed as promising signal candidates in this range.Here, after focusing on 800G for the time being, the following slides list the advantages and disadvantages of PDM-32QAM and PDM-16QAM.According to Mr. Zhang, PDM-32QAM has already confirmed its operation at the laboratory level, and because the transmission speed is as low as 96GBaud (compared to PDM-16QAM), the sampling rate can be lowered, resulting in power consumption. is also lowered.In PDM-16QAM, these merits and demerits are, of course, reversed.SNR can be slightly lower, but there is a drawback that the communication speed is increased by that amount.So let's say we actually tested the sensitivity and OSNR in a 96GBaud PDM-32QAM environment.The first is the relationship between ROP (Received Optical Power) and BER.The BER was set to 1.25E-2 because the OIF 400ZR uses 1.25E-2 CFEC (Concatenated FEC). be done.Also, when using 4.5E-3 FEC (Stairecase FEC), the margin naturally decreases to about 7.2dB, but this is said to be a margin of about 10km fiber Link Loss + 1.2dB.However, this is fine for 10km, but for 40km ER, I feel that this is difficult no matter how I think about it. performance can be improved) is probably because it is not yet a rigorous study at this time.Similar considerations for the OSNR budget are below.2E-2 is newly added to BER, which is 8.4 dB, 1.25E-2 is 7.3 dB, and 4.5E-3 is 5.2 dB.Is the SNR of 7.3dB at CFEC (BER=1.25E-2) sufficient for the receiver side?It is a delicate place when asked, but it seems that it is within the scope that can be handled.However, even if this is sufficient for the reach of 10 km, I feel that it is a bit harsh at 40 km.There is an optimistic attitude that "The gap between the theoretical limit and measured result indicates potential space for further improvement." It looks like they're going to push through.In conclusion, at least 96GBaud PDM-32QAM has been confirmed to be promising in a simple experiment, and it is said that Stairecase FEC can be used to suppress the BER to 4.5E-3 and implement it.120GBaud PDM-16QAM has not been considered, but in terms of FEC, as you can see in the graph of "Capacity analysis" showing the relationship between signal speed and SNR, there is a margin for BER, so implementation is even easier. I think it's a decision.Now, since this presentation does not have a Straw Poll or Motion, I think it will be just a reference opinion or a basis for future discussions, but at the end of the slide above "Comparison of two candidates for 800 Gb/s" Let's touch on the sentence "120GBaud PDM-16QAM will be studied in the near future."This opinion seems to be the opinion of HiSilicon Optoelectronics.What is the opinion of other companies?For example, according to the NeoPhotonics Company Overview for the third quarter of 2019, 800G 120GBaud 16QAM is scheduled to be provided in 2021, and 96GBaud 32QAM is scheduled to be provided in 2022.In a more recent document, "Trends and Technology: Coherent Pluggable Modules Unleashed" dated September 2021, the test results of "800G-ZR+" are posted, but looking at the test configuration, AWG (Arrayed Waveguide Grating) to the CDM (Coherent Driver Modulator) at a rate of 120GSamples/s, which looks like a 120GBaud configuration at 16QAM.Alternatively, according to the "400G and 800G Ethernet and Optics" slides presented by Andreas Bechtolsheim, Chairman and CDO (Chief Development Officer) of Arista Network in 2019, the company has already verified the feasibility of 120GBaud 16QAM. andFurther discussion was carried over to the Task Force, and as a result, all 26 methods were included.This Project Document will be explained at the IEEE Plenary Electronic Meeting on November 16th.Freelance technical writer.His expertise spans a wide range of fields, from CPUs, memories, and chipsets to communications, OS, databases, and medical-related fields.Homepage is http://www.yusuke-ohara.com/800G favorite "IEEE 802.3 Beyond 400 Gb/s Ethernet" achieves 800G/1.6T with 100/200G signalsOSFP MSA and two IEEE trends related to 800G EthernetCopyright ©2018 Impress Corporation.