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Single mode fiber cable: which SFP module? (lemmy.world)

submitted 6 months ago by peregus@lemmy.world to c/homelab@lemmy.ml

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My Internet provider just installed a 2,5/1Gbps Internet connection and I've asked the guys to run a couple of their fiber to connect my router (HP Prodesk with OPNsense) to my server. I didn't know that the fiber is single mode and all the SFP+ sold used now seems to be all for multi mode fiber (www.bargainhardware.co.ukfor example). The cable is about 30m, can I use a 810nm SFP+ or is it definitely better to use a 1310nm?

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[–] dhork@lemmy.world 2 points 6 months ago (2 children)

Oh, they just left you some extra patch cables? That was nice of them.

The wavelength of the fiber might be printed on it. I know some fibers are color-coded based on their wavelength, but I don't know if it's universal.

You'll need to match the modules to the fiber.

[–] peregus@lemmy.world 2 points 6 months ago

I've checked on a forum and they say:

GPON adopts WDM to transmit data of different upstream/downstream wavelengths over the same ODN. Wavelengths range from 1290 - 1330 nm in the upstream direction and from 1480 - 1500 nm in the downstream direction.

So I guess that all the single mode SFP+ that have that range are ok.

[–] peregus@lemmy.world 1 points 6 months ago

Unfortunately there is no wavelength on the cable, I'll check the ONT