Optical beam steering using small angle beam steering device
In one aspect the system serves as a transmitter and comprises an optics system; a plurality of source elements positioned on the focal plane; and, a small angle beam steerer. The plurality of source elements are each capable of providing a point source of radiation to the optics system. The optics system provides a collimated output. The small angle beam steerer receives the collimated output and redirects the collimated output through a small angular deviation. The redirected output is thus transmitted in a desired direction without a need for mechanical gimbals and is capable of covering a large angular range with respect to the optical axis of the optics system. The system can also be implemented as a receiver.
1. An optical beam steering system transmitter comprising:
a focal plane having a plurality of source elements thereon;
an optics system receiving light from a selected one of the source elements and providing an output beam, a large steering angle of the output beam being defined by a position of the source element that was selected; and
a small angle beam steerer receiving the output beam and determining a small steering angle of the output beam.
2. The optical beam steering system transmitter as recited in claim 1 , wherein the output beam from the optics system is collimated.
3. The optical beam steering system transmitter as recited in claim 1 , wherein the small angle beam steerer is capable of steering in a range of about 0 to 5 degrees.
4. The optical beam steering system transmitter as recited in claim 1 , wherein the small angle beam steerer comprises an optical phased array.
5. The optical beam steering system transmitter as recited in claim 1 , wherein the optics system comprises a wide angle lens.
6. The optical beam steering system transmitter as recited in claim 1 , wherein the optics system is positioned generally between the focal plane and the small angle beam steerer and is spaced from the source elements.
7. The optical beam steering system transmitter as recited in claim 1 , wherein the small angel beam steerer comprises an acousto-optic device.
8. The optical beam steering system transmitter as recited in claim 1 , wherein the source elements comprise an optical switching network and further comprising a plurality of optical switch devices.
9. An optical beam steering system receiver comprising:
a focal plane having a plurality of detector elements thereon;
a small angle beam steerer receiving light and determining a small steering angle of the light so as to direct an output beam toward one of the detector elements; and
an optics system positioned between the focal plane and the small angle beam steerer, the optics system receiving light from the small angle beam steerer and providing the output beam, the output beam being directed toward one of the detector elements according to a large steering angle defined by an angle of the light received by the optics system.
10. The optical beam steering system receiver as recited in claim 9 , wherein the input light to the optics system is collimated.
11. The optical beam steering system receiver as recited in claim 9 , wherein the small angle beam steerer is capable of steering in a range of about 0 to 5 degrees.
12. The optical beam steering system receiver as recited in claim 9 , wherein the small angle beam steerer comprises an optical phased array.
13. The optical beam steering system receiver as recited in claim 9 , wherein the optics system comprises a wide angle lens.
14. The optical beam steering system receiver as recited in claim 9 , wherein the plurality of detector elements comprise PIN's.
15. The optical beam steering system receiver as recited in claim 9 , wherein the plurality of detector elements comprise APD's.