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

[Martin Flynn]

Started into white rabbit on fiber recently -Â  one tidbit that was 
shared with me:Â  White rabbit typically uses a BIDI over a single fiber 
to keep the fiber length (and respective transmit / receive times) as 
close as possible

Martin

W2RWJ


On 8/29/2021 10:03 AM, paul swed wrote:
> 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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