Pooh Bear said:

IIRC, TOSLINK has barely 7 MHz of bandwidth.
Have to look that one up, though. May be old information.

For parts like this - TOTX 111- yes - Toshiba quote 6 MHz in fact

http://www.semicon.toshiba.co.jp/td/..._datasheet.pdf

That was what I had in mind, yes.
There are better drivers available today, though.

--
Sander deWaal
"SOA of a KT88? Sufficient."