Anyone tried fiber into EtherRegen SFP?

Issue is if one doesn't have optical input on streamer and optical ISP we're converting ethernet to optical back to ethernet. So consider optimized ethernet> optimized optical> optimized ethernet. This would be something like router or switch (both need optimization via lps, cables etc)> two opticalmodules with Finisar, or possibly Telegartner unit Latik pointed out (lps, cables,etc)> optimized ethernet either before streamer or within streamer, in my case within streamer via JCAT Net XE card. So now we have total optimize network from router through streamer.

Compare to simpler all ethernet setup. Only need in most cases a single ethernet filter, something like Acoustic Network Muon. Will optical/ethernet setup described above be superior to this simpler ethernet setup? Lots of complexity involved in the hybrid setup, also expense. For me it would have to pay off big time to go with this complex, cluttered arrangement. Still, could be worth all the compexity, I'm not that far away from attaining the complex hybrid setup if I went to one streamer setup, would only need to purchase a single OM, have every other piece to make this happen. With two box streamer setup, optimizing both sides of  server  gets really crazy with complexity.

@lollipopguild

​​​​​​​​I use FMC (ethernet-fiber-ethernet) from ER port B to the streamer and it improves sound.

I tried using the ER SFP input, but it degraded sound in comparison to ER ethernet input in port A.

Here is an issue that puzzled me. I upgraded all SFPs to the Finisar 1324, but the ER wouldn't work with it. The ER works well with the cheapo SFP I bought from Amazon. 

I think the ER prefers the ethernet input. I will next try the FMC (ethernet-fiber-ethernet) method between the ethernet source and the ER.

This is the digital chain that I am using with upgraded Finisar transmitters, sound is clear, detailed. Black backgrounds. All using no ether-regen. Upstream network is clean with quality modem. No Wi-Fi routers in my listening room. 

router => FMC RJ45  =>  Fiber  =>  ER SFP A-port   => RJ45 B-port  =>  Innuos Zenith RJ45

These upgraded transceivers are not guaranteed to work with all optical devices, may be ok to try with cheaper generic FMC, may not want to spend big on optical component only to find the Finisar doesn't work with your equipment. There is AfterDark thread over at audiophilestyle fourm that discusses this compatibility to some extent, John or Alex of Uptone contribute.

@sns I have looked at AfterDark, but for such an audition the overhead of import taxes and possible return are discouraging.  My ADOT kit should arrive in a day or two.