The problem isn't getting the SFPs to "listen" to different wavelengths. The problem is that SFPs "listen" to ALL the wavelenghts.
This is why you have to use a demux to separate the wavelenght, so that you only "listen" to the one meant for you. Alternatively you can use a filter to block out all the other wavelenghts than the one you are interested in. NG-PON uses a mux in the OLT side and active filters on the ONU side. Jared > Sent: Thursday, October 11, 2018 > From: [email protected] > To: "AnimalFarm Microwave Users Group" <[email protected]> > Subject: Re: [AFMUG] Dumb Fiber MUX question > > Well, I can some some of them listen to different wavelengths or else NG-PON > would never work. > > But a CWDM mux is pretty cheap. > > -----Original Message----- > From: [email protected] > Sent: Wednesday, October 10, 2018 3:41 PM > To: [email protected] > Subject: Re: [AFMUG] Dumb Fiber MUX question > > > Can I use a splitter instead of a Mux/Demux? > Not to separate wavelenghts. > > > > I'm just thinking if I have color coded SFP's that only talk and listen > > on their own wavelengths, and assuming I'm ok with the losses from > > splitters, then do I actually need a Mux? > SFPs have broadband light detectors, so they don't actually "listen" to a > specific wavelenght. > So, yes, you need to demux the wavelenghts in order to filter away all > other wavelenghts than the one you want to "listen" to. > > If you are using just one TX and one RX wavelenght then you could use a > splitter on both ends assuming you have the optical budget and there aren't > too many impairments degrading the signal (reflections, self interference, > etc.). But if there's just one RX and one TX, why not use Bidi optics > instead? > > Anything with more then one TX or RX wavelenght will need muxers and > demuxers. > > > I'm looking at a scenario where I could have a Mux at one end of a > > fiber, but I don't have electric at the point where I'd like to split it > > back into two connections. That's what got me wondering. > If you use a passive mux/demux you don't need power. > > However, I feel like I'm missing something. Are you trying to use a > splitter instead of a OADM? > > Something funky like this? > > MUX--splitter--DEMUX A > | > \-- DEMUX B > > I guess that could work. > > > Jared > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
