Started into white rabbit on fiber recently - one tidbit that was
shared with me: 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 <[email protected]> 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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