infrared transmitters

You want to multiplex by optical frequencies? There is no simple way to do this. Standard emitters have way to wide a spectrum. It would require Laser emitters and even then the wavelengths listed are quite close together. Furthermore, it would take advanced optical processing, spectrum analysis, etc. to separate the signals when received. But, why do you want to do this? Why not multiplex with different modulation frequencies or multiplex with time division at a single mod. frequency. You need to be more specific about the information you want to transmit and its bandwidth and one of us can suggest how you might do it. Bob

Why this approach? What are the 6 signals you're transmitting? Are they continuous (analogue) or discrete (digital)? What bandwidth? After analysing the problem, you might discover another solution e.g. time division multiplex.

To answer directly, I'm not aware of reasonable cost devices. There probably are expensive solutions, e.g. using filters, but filters with centre frequencies as you've shown (and narrow bandwidth as you've shown) will be costly.

By the looks of it I would need to use infrared filters over the emitters... Sounds more complicated than I expected... Think I will use another system..

Paul...