25Gbps x 4 is integrated into one S...
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25Gbps x 4 is integrated into one SMF, realizing 100Gbps, "CWDM4 MSA" with a reach distance of 2 km, and "4WDM MSA" 10/20/40km.
"CWDM4 MSA" aims to build an interface with a maximum of 100Gbps with a 25Gbps x 4 lane in one SMF.
The "CWDM4 MSA" introduced this time was established in March 2014 with five companies, Avago Technologies, Finisar, JDSU, OCLARO and Sumitomo Electric, as Founder Member.
After that, the number of members increased rapidly, and in September 2014, Revision 1.Although it has changed, JDSU is a company split and Finisar is due to the acquisition).At this time, the Hilight Semiconductor LTD has been added to 16 companies.
The purpose of CWDM4 MSA is to build a cheap interface with a maximum of 2 km at 100Gbps, assuming use in the data center.
2 km is a bit extra distance to use in one building, but for example, a data center is built in a certain place, and demand has increased, and another building in the data center is built next to the equipment, and equipment.Sometimes there are cases where expansion is expanded.
In this case, the wiring length can easily exceed 1km.In one example, Google opened in 2006 in Dallas, Oregon, consisting of three buildings (can be confirmed on this Google Map), but if you want to directly connect between the two buildings divided into left and right.Since it is not possible to wire the central building and wire it like a thread phone, it will be inevitably through the detour route.
Then, 500m is quite last, and I want a little more room.Even so, the building is often forced to detour wiring, so there is a need to reach a distance exceeding 500m (but it doesn't require 10km like 100GBase-LR).can.
In order to achieve this, the basic configuration is that by using CWDM4 to consolidate 25Gbps x 4 lanes into one SMF, a pair of SMF achieves a reach distance of 2 km.。Regarding CWDM, I mentioned a little in "400ZR", which uses coherent light that decrypts the phase -changing optical signal and a multiple weight "DWDM" ", but in short, the wavelength or frequency distribution is distributed.Refers to relatively sparse standards.
The wavelength used in CWDM4 is actually "IEEE 802, which realizes 400Gbps at 50/25Gbps per lane..It is exactly the same as "200GBASE-FR4" introduced in "3BS".However, while 200GBASE-FR4 uses 56g of PAM-4 modulation, 100G CWDM4 is a normal NRZ, and the signal rate is 25..It is 78125GBD.
In the first place in 2014 when the specification formulated, the 56g PAM-4 modulation was still at the level of high cost, and the technical difficulty was too high, so of course it was not an option.Speaking in time series "IEEE 802.Prior to "3BS", 100g CWDM4 MSA is standing up, and in that sense, the implementation of 100g CWDM4 should be a reference of 200GBase-FR4.
