The options you have to choose from realistically is QSFP28-ER4L
It exist in a fec and non-fec option that does 30 and 40km respectively although a few vendors spec them at 25km cause its really hard to validate them in their upper ranges. But this is quite and expensive optic.
On the horizon you have QSFP28-4WDM20 and 4WDM40 which uses FEC. Not sure where the MSA stands on that.If you need more then 30-40km reliable stuff you need to either to PAM4 (The "Inphi ColorZ" optic) which is 80km at best. These should not be confused for the regular 10G ZR-optics with a fixed lambda you can buy for $300 from china. These are dual-laser optics that runs two 50G PAM4 carriers with very low launchpower. They need pre and post-amps aswell as tuned DCM and a MUX to fully work. Also they are fixed wave so you need 44 different optics to populate a full MUX. These optics are great if you need tons of 100Gs on very short metro-spans.
It always almost ends up with coherent being the better option in the end anyway if you wanna go beyond 20-25km. There is like 30 different competing products on the market now that acts as a stupid little transponder with a QSFP28 in one end (where you plug your DAC in) and a CFP2-ACO (or DCO) in the other end that let you run a couple of hundred kilometers (or thousands) with a proper coherent DWDM signal.
Now that CFP2-DCO is GA finally i hope to see more linecards and switches that has CFP2 slots in them.
Hi What options are available for 40G QSFP+ and 100G QSFP28 for 10+ km links? I see a lot of switches offered with QSFP+ and QSFP28. But I do not seem to find the necessary optics to build the links I want. For example, take a look at the options available at Fiberstore: https://www.fs.com/c/generic-40g-qsfp-891 Generic Compatible 40GBASE-LR4 and OTU3 QSFP+ 1310nm 10km LC Transceiver for SMF $340 Generic Compatible 40GBASE-ER4 and OTU3 QSFP+ 1310nm 40km LC Transceiver for SMF $1500 https://www.fs.com/c/generic-qsfp28-100g-transceivers-2858 Generic Compatible QSFP28 100GBASE-LR4 1310nm 10km Transceiver $1999 Generic Compatible QSFP28 100GBASE-ER4 1310nm 40km Transceiver $7000 That is it. Four modules and the 40km are prohibitive expensive. The situation at other vendors appears to be similar. I need stronger modules that can do more than 10 km without being extremely expensive. Or DWDM modules in the 1550 nm band so I can use external amplifiers. Am I looking in the wrong place? Is this expected to be available in the near future? Regards, Baldur
-- hugge
signature.asc
Description: OpenPGP digital signature