Regarding Ethernet or 10GBASE-T, from 2017 [10GBASE-T, finally popular?], We delivered a total of 11 times and 2 extra editions.However, Ethernet for copper wiring by twisted pair is up to 10GBASE-T, and 25 / 40GBASE-T has not yet been put into practical use.* 1 "40GBASE-FR" (IEEE 802.3bg): Only mentioned in the 10GBASE-T article before, and no explanation of the standard is given in the first place * 2 "200GBASE-ER4 / 400GBASE-ER8" (IEEE 802.3) cn-2019): Only mentions that there is such a standard * 3 "400GBASE-ZR" (IEEE P802.3cw): Only explains that the Task Force was divided * 4 Not yet formulated or officially in the process of being formulated Standards with undecided names * 5 "200G-FR4-OCP / 400G-FR4-OCP / 800G-FR4-OCP": Only the fact that there is such a standard in OCP is introduced.Also, regarding "IEEE 802.3cd-2018 / IEEE 802.3cm-2020 / IEEE 802.3cn-2019 / IEEE 802.3ct-2021 / IEEE 802.3cu-2021", it is still treated as Task Force at the time of writing the manuscript, and finally The standardized work could not be reflected.That's why I would like to make these supplements several times in the future.So this time about "40GBASE-FR".This standard was standardized in 2011 as "IEEE 802.3bg-2011".It is included in IEEE 802.3 as Clause 82/89.Clause 82 is a specification for PCS that uses 64B / 66B Encode, and it uses "40GBASE-R" and "100GBASE-R", which is the same specification as "100GBASE-SR4".The difference is the signal speed, which is defined in Clause 89.The wavelength is 1530 to 1565 nm, and one lane is used for transmission and reception.The signal speed is 41.25GBd, and the data transfer speed is just 40Gbps through 64B / 66B Encode.As you can see from the fact that the reach is FR, the reach is 2m to 2km.Of course, it is supposed to be used in SMF.By the way, the center wavelength is 1550 nm.It seems that the use of 1310 nm was also considered in the early stage of the study, but this was abandoned at an early stage.Originally, the purpose of 40G BASE-FR was to quickly and inexpensively formulate a 40G Ethernet standard using the existing 40G standard.The existing 40G standard is OTU3 / STM-256 / OC-768 / 40G PCS (Packet over SONET), and this physical layer is used as it is for Ethernet.The troublesome thing was that the OTU3 / STM-256 was specified as ITU G.693 and G.959.1, but G.693 lists the following two wavelengths, which one. I rubbed it by using it.It must be said that 40Gbps / 2km with a pair of optical fibers was unique at that time, but the standardization of "40GBASE-SR4" for short distances and "100GBASE-LR4" for long distances has already been completed. If 40G is acceptable, "40GBASE-SR4 / 40GBASE-LR4" products are on the market, and there was no merit to switch to 40GBASE-FR here.Free technical writer.We have a wide range of fields of expertise, from CPUs, memories, and chipsets to communications, operating systems, databases, and medical care.The homepage is http://www.yusuke-ohara.com/List 96G / 192GBaud with PDM-32QAM and 120G / 240GBaud with PDM-16QAM for 800G realizationList 96G / 192GBaud with PDM-32QAM and 120G / 240GBaud with PDM-16QAM for 800G realizationAdopting "ER8" and MZM aiming for a reach of 40km at 800G, two DSPs for 400G are arranged in parallel4 plans of "800Gbps / 10km Reach SMF" that realizes a reach of 10km at 800GCopyright © 2018 Impress Corporation. All rights reserved.