[c-nsp] Single-mode GBIC question

[les]

I've combed the web with no luck to the answer of my simple question....

If you use SINGLE-MODE fiber and gbics for very short runs (same room,
across the street), can you damage the GBICS?

What has been your experience. Oversaturation? Life-shortening? We
typically use SM towards the telco and MM for internal but have ran
into some legacy fiber where it's SM internal. I have electronic
background so terminology is familiar.

thanks in advance
-les