aptr@ur-tut.UUCP (The Wumpus) (05/14/86)
I am wondering about how to transmit aduio signals using fiber optics
instead of wires. The reason I would like to run fiber optics is that
I want to build a circut that requires many audio lines to be transmitted
side by side, and that must be very good at rejecting a few very powerful
radio stations in the neighborhood. (I live <1/4 of a mile away from
the main radio/television towers in Rochester.) I know that it is
possible to convert an analog signal electrical signal to an analog
light signal, but I am not really sure how to do it. Any suggestions?
The Wumpus UUCP: allegra!rochester!ur-tut!aptr
BITNET: aptrccss@uorvmjim@hpmcla.UUCP (05/15/86)
You might look into pulse width modulating the audio signal and feeding that directly into your fiber optic cable. It is quite straight forward, inexpensive, and signal recovery can be implemented with a simple low pass filter. Also, signal quality (low noise and distortion) can be quite high with relatively little effort. Circuits for pulse width modulators can be found in most college texts on electronics as well as in many hobby books.
jpexg@mit-hermes.ARPA (John Purbrick) (05/16/86)
> I am wondering about how to transmit aduio signals using fiber optics > instead of wires. The reason I would like to run fiber optics is that > I want to build a circut that requires many audio lines to be transmitted > side by side, and that must be very good at rejecting a few very powerful > radio stations in the neighborhood. (I live <1/4 of a mile away from > the main radio/television towers in Rochester.) I know that it is > possible to convert an analog signal electrical signal to an analog > light signal, but I am not really sure how to do it. Any suggestions? You might do better to digitize the signal and transmit it serially. Optical lines aren't all that efficient, and analog data might be hard to transmit with fidelity. There are all kinds of buyable or buildable setups for optical links.