[time-nuts] Re: About 10 MHz Optical Distro

[paul swed]

I did see the tp link. Pretty amazing. For the group these devices are
pretty useful.
But watch out for the wavelength of the light you typically need matching
fiber. Also note the connectors and get the matching units.
I have no idea how well 1350 light would pass on multimode for 850 nm.
Regards
Paul
WB8TSL

On Sat, Aug 28, 2021 at 11:57 PM Lux, Jim <jim at luxfamily.com> wrote:

> On 8/28/21 7:13 PM, AC0XU (Jim) wrote:
> > Thanks to all the posters. Especially to Dana -  That is exactly what I
> was looking for - suggestions for parts and/or circuits to do the job. I
> was originally thinking that I would go with a digital circuit (sine to
> square to sine), but maybe analog/sinewave would be simpler and perform
> about as well.
> >
> > Anyway, I have ordered some of the recommended optical transceivers.
> We'll see how that works out.
> >
> > One or two posters mentioned that phase noise and/or thermal stability
> may be issues. The referenced research papers don't seem to indicate that
> phase noise is a problem. I don't think that thermal effects will be a big
> problem for me - I just need to check the phase calibration from time to
> time. Certainly there are expensive commerical optical clock distribution
> systems with excellent properties. Maybe the devil is in the details...
> >
> > My specifical application at the moment is putting several SDRs at
> diverse antenna locs and feeding the IF via ethernet-converted-to-optical
> to my computer. I may want to transmit at some point but receiving is all I
> want to do for now. Still need a way to get a stable ref clock to each
> radio to provide phase coherence.... I only need 50-60 meters but an
> optical solution with single mode fibers can go many km if I ever wanted to
> scale up. Anyway, my plan is to have only power carried by copper.
> >
> > I don't want to go with coax, twisted pair, or any other copper solution
> because of high ambient noise levels in my area and a desire to avoid
> adding to it. Stringing several 100 meters of copper about my yard,
> carrying 10 MHz clock signals, no matter if the cables are well shielded,
> doesn't seem like a great idea.
>
> This is totally the thing that OVRO LWA dealt with.. Not only is fiber a
> LOT cheaper than coax, it solves a lot of problems.
>
> Ethernet to fiber is really cheap ($20 for an endpoint from TP-link )
> $20 from newegg
>
>
> https://www.newegg.com/tp-link-mc100cm/p/N82E16833704015?item=N82E16833704015
>
>
>
>
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