On 12/18/17 09:01, Baldur Norddahl wrote: > 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? qsfp28 is heavily constrained by power budget. The inability to put a serdes in the package does also very much constrain the form factor since it's 4x25 wavelengths.
cfp2-aco is the approach that stops paying for the DSP with every optic (DCO does that) gets you long haul single wave, DWDM and tunables, but it's a bit of an incovenient form-factor for fixed configuration 1ru switches. > > Regards, > > Baldur >
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