Cisco doesn't have a supported long-range single-strand single-mode fiber transceiver (SFP). You can call TAC and see if they can give you any ideas, but I don't think there will be anything.
Is the fiber continuous? Perhaps you can lease an interface midway from the ISP to bridge the gap. Theoretically, the fiber wave should be able to go the whole distance, but they put those distance limitations on there for a variety of reasons. :)
As suggested by Criag, you can check media converter.
One more solution you can have is CWDM.
I dont know your budget but you can use third party CWDM box like this. I this you will buy CWDM transmitter from Cisco but will use this passive device like shown in tis box. I saw the optical power for CWDM transmitter is 29dB from Cisco have enough power to go 30Km you are looking at (though can go much more than that).
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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