would be like trying to hook your CD player up to a light bulb.
Which actually works. Provided your transmitter ("light bulb") and receiver (photocell, etc) is capable of the bandwidth. Tungsten filament? No (well, yes, to a degree...for a nice "warm" sound). LED? Quite possibly. Light is electromagnetic radiation just like "radio" waves (wave/particle duality theory aside). Just like you can modulate a 105-MHz FM-band radio wave to carry sound (or other information), you can similarly modulate a 4.6x10^14-Hz (that's 460 Terahertz, kids! Microwave radiation is commonly in the 2-4 Gigahertz range) signal (red light, 650 nm [in a vacuum, for hair-splitters]) to carry sound, or even RF-band information. The key is in the modulator and demodulator at either end of the transmission medium.
Theoretically.
Practically, such devices may or may not exist (sure, for AF, not so sure for RF), and if they do exist, may be prohibitively expensive.
But the point remains, any signal you can send over coax, you can modulate and send with light, given the right circuitry.
*waits to be thwapped with physics books* ~Brian -- TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug TriLUG Organizational FAQ : http://trilug.org/faq/ TriLUG Member Services FAQ : http://members.trilug.org/services_faq/ TriLUG PGP Keyring : http://trilug.org/~chrish/trilug.asc
