We experience the exactly the same problem with the the Mikrotik SFP DDM S-35/53LC20D
single fiber modules.
The RB260GS are on the latest firmware version 1.12.
After a power loss, the link is not restored. To restore the link the SFP module needs to be taken out and plugged in again!!
Our units are remotely placed in Camera poles and therefore the need to resolve this issue is high!
Thank you for the quick support! Martin
we have serious problem with RB260:
we are using RB260 with singlemode 1-fibre SFP modules (1310, 1550nm) GigaLight GPB-3524L-L2CD-C (cisco compatible) "blue"
and another end of fibre is
EDGECORE ES4624-SFP or SIGNAMAX 065-7851 or brocade FCX624S-F
or RB2011xxxx with "yellow" GPB-5324L-L2CD-C
problem is SFP initialization after SHORT power failure or FAST DISCONNECT/RECONNECT power adapter on RB260 - ethernet ports are working,
but in switch management is SFP module not visible and autonegotiation settings not checked (fw didnt remember that settings????)
after unplug and plug SFP works normally, problem problem is with SFP initialization / handling on RB260?!
tested also 1-fibre SPB-7710CIS-HTR - SPB-7610CIS-HTR and working correctly ...?
2-fibre SFPs are working normally, so problem is with 1-fibre SFP handling/negotiation/initialization?? ...
CAN U PLEASE MAKE FIX FOR THIS BUG????!!! this problem can be maybe fixed with sfp socket restart after RB260 boots up ... maybe ...?