Patent ID: 7751716
Filing Date: 2010-07-06
Classification: H01S,H04B

Abstract:
1. A communication device for transmitting signals to a receiver comprising: at least one laser adapted to generate coherent light simultaneously at multiple wavelengths and different frequencies; said receiver including at least one detector adapted to detect said coherent light at multiple wavelengths and different frequencies; said at least one laser and said at least one detector being positioned in out of line-of-sight relation to one another; said at least one laser positioned at a first fixed distinct position in a first enclosed structure such as a first building; an opaque barrier positioned between said at least one laser and said at least one detector, said opaque barrier causing said at least one laser and said at least one detector to be in said out of line-of-sight relation to one another; a plurality of external remote laser targets and target spatial regions fixed in line-of-sight relation to said at least one laser and in line-of-sight relation to said at least one detector; said plurality of external remote laser targets and target spatial regions being disposed at a second fixed position remote from said first fixed position, said second fixed position being a second distinct position separated from said first distinct position by a large distance; said external remote laser targets and laser target spatial regions including trees, buildings, clouds, atmospheric aerosols, ambient atmosphere including atmospheric gases, and like objects that are out-of-doors relative to said at least one laser and relative to said at least one detector; a modulating device connected in modulating relation to said at least one laser, said modulating device disposed at said first fixed distinct position; said modulating device adapted to modulate each of said multiple wavelengths so that multiple messages are transmitted simultaneously; said communication device adapted to aim said modulated light from said at least one laser at said plurality of external remote targets and target spatial regions to separate spatially different communication optical signals from one another; said at least one detector adapted to demodulate light scattered by said target; said at least one detector being disposed at a third fixed distinct position remote from said second fixed distinct position in said line-of-sight relation to said external remote targets and said target spatial regions; said third fixed distinct position of said at least one detector being disposed a large distance from said first fixed distinct position of said at least one laser; said at least one detector including an optical bandpass filter adapted to pass preselected wavelengths of light and reject wavelengths of light outside of said preselected wavelengths; said optical bandpass filter being disposed at said third fixed distinct position; whereby multiple messages are simultaneously transmitted along multiple wavelengths and different frequencies; whereby said multiple messages are individually detected by said at least one detector and; whereby at least one laser beam follows a generally “V”-shaped path of travel between said at least one laser and said at least one detector.