I want play on PS3 (optical).
Okay, gotcha. Well my last suggestion is maybe using a sound card with Optical in and out (like the Sound Blaster Z or whatever) to do the same type of thing. You'd have to setup a PC within optical-cord-distance of your PS3 to act as the DSP, but I suspect it'd work. You could have it double as an HTPC or something. :-D