"Optical Communications" . "optical communications" . . . . . "optical networks" . . . . . . . . "optical transport" . "Optical telegraphy" . "signaling system" . . . . . . . "optical" . "optical transmission" . . "lightwave communications" . "optical communication systems" . . . "Optical signals" . . . "light-wave telecommunication" . "optical communication" . . . "Optical communication" . "communications" . "optical transients" . "optical fibre communications" . . . . . . . "Optical communication" . "optical telecommunications" . . "optics" . "optical signals" .