Spdif RCA to Spdif Optical conversion - degradation??
 

I have a digi 002 and I'm already using the spdif rca input. (for a mini-me) I'd like to use the 002's optical input for a second mini-me, but the mini-me only has an RCA spdif output. Is there a converter that changes RCA spdif to optical spdif? And, if so, would that degrade the quality of the audio? (or no because it stays in the digital realm?)

Tnx!