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heterodyne fiber optic system?
its a radio! :D
Het is short for heterosexual, heterogeneous, or even heterodyne.
Josef Stricker has written:
'Electronic heterodyne moire deflectometry' -- subject(s): Electronics
'Deferred electronic heterodyne moire deflectometry' -- subject(s): Heterodyning (Electronics)
Perhaps this will help?
http://en.wikipedia.org/wiki/Heterodyne