Sending communications on light waves

[Petyab]

Here's a quick question...though it may stick on your mind for a while and become a long question. Are all light waves going to be stable for sending communications or is...this is semi rhetorical...the freqeuency of the light going to make the communication of data subject to interstellar mediums. Also, an interesting thing to think about is that if you sent data in a straight line many many light years away what is the probability that the communication will or won't be interfered with by suns and path crossing asteroids. Perhaps a series of satellites and refocusers could be used to move communications around star systems. Imagine if they were stealthed too. One of the only ways to intercept these communications would include having knowledge of the language or being able to decipher the intercept. Then you'd need to triangulate the source and destroy the satellite; or in a cunning show of evil genius transmit communications with a synthesizer that mimic the voice of the communication to set traps...I know...I know...theory crafting is semi frowned upon here. However, it seems plausible a highly intelligent race may be doing this for security out there somewhere, and really, the foundation for such claims that this may be occurring are based on real possible science. For anybody that doesn't know that reads this we have a satellite that has left the solar system that still sends communications back to earth.

More on topic with my initial question. Would the wave group equation for interstellar communications turn out to be a complex matrices with material equations in it to determine the effect of the mediums between origin and destination or do you think it could be justifiably and accurately represented by one simple classical equation...once again...partially rhetorical because I don't see how with all the evidence of doppler shifting we could expect w(f(i)) to be the same as w(f(f)). Let's try to get a good discussion going on this.

 

[Danger]

You're getting way ahead of yourself, man.
Almost all of our communications these days are on light waves. Broadcast TV (as opposed to cable), radio, cordless and cellular phones, WiFi... they're all radio based, and radio is just another part of the EM spectrum as are the various frequencies of visible and near-visible light.
Your assumptions about evil aliens have no place in a serious science forum. It might be interesting if moved to General Discussion.

 

[HallsofIvy]

I once read a review of a history book that referred to a remark in the history book to the effect that hundreds of years ago, new could not travel faster than a fast horse. The person writing the review pointed out that this was not true. News could be sent very fast through the use of "semaphore towers" (with large vanes that could be moved so that a person far away could see the position of the vanes and "read" the message, or by "dot-dash" light signals or even sending "yes-no" information by setting up a series of bon-fires that could be lit to send a signal.

All of those are "sending communications on light waves"!

 

[jtbell]

News could be sent very fast through the use of "semaphore towers"

http://en.wikipedia.org/wiki/Semaphore_line