Fibre converters - do I need to match them

I have a pair of old 10/100 fibre converters on either end of a fibre optic run. The collision light is on permanently on both of them and network performance over the link is abysmal. I think one of them malfunctioned because of a power surge (maintenance had to reset some trip switches this morning and the problem began) . Can I replace one of them or do I need to change both, bearing in mind the new one will probably be a gigabit converter or better? Their is no brand name on the converters. The collision light stays on even if no cables are plugged into the converter ( I presume you cannot have collisions if their are no cables plugged in).
OwenMoriartyAsked:
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Nayyar HH (CCIE RS)Network ArchitectCommented:
Have you tried the usual switch-off for a couple of minutes and back? You probably have, Anyway, The new converter should support the Ehernet standards you are currently using. I would be 100BaseT-to-100BaseFX.

Found this link after googling for converters.

http://www.metrodata.co.uk/products/Media-Ethernet-Converters/fc7x00-10-100baset-to-100base-x-media-converter.htm

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