Beam steering element with built-in detector and system for use thereof
View Patent ↗An all-optical cross-connect switching system provides optical switching that may reduce processing requirements by three orders of magnitude over conventional techniques by associating at least one optical detector with an optical beam steering element. In one embodiment, a first beam steering element, having a reflective surface in optical association with a first optical fiber array, and a second beam steering element, having a reflective surface in optical association with a second optical fiber array, are optically arranged to direct an optical beam from a first optical fiber in the first optical fiber array to a second optical fiber in the second optical fiber array. The optical detector provides information about a first position of the optical beam on the second beam steering element. Based on this information, the angle of the first beam steering element may be adjusted to cause the optical beam to change to a second position on the second beam steering element.
1. A method for manufacturing an optical beam steering element, comprising:
configuring a portion of a semiconductor material to be an optical detector;
associating a reflective surface at the portion of semiconductor material; and
configuring the portion of the semiconductor material to be a movable beam steering element.
2. The method according to claim 1 wherein associating a reflective surface with the semiconductor material includes depositing a metal.
3. The method according to claim 1 wherein associating a reflective surface with the semiconductor material includes coupling a metal or dielectric to the semiconductor material.
4. The method according to claim 1 wherein configuring an optical detector on a portion of the semiconductor material includes fabricating a semiconductor detector in the semiconductor material.
5. The method according to claim 1 wherein the optical detector includes an n-doped region, a p-doped region, and respective electrical contacts configured to support connection to an electrical circuit.
6. The method according to claim 1 wherein configuring at least a portion of the semiconductor material to be a movable beam steering element includes etching the semiconductor material surrounding the portion of the semiconductor material.
7. The method according to claim 1 wherein configuring the portion of the semiconductor material to be a movable beam steering element includes mounting the portion of semiconductor material on torsion hinges.
8. The method according to claim 7 wherein mounting the portion of semiconductor material on torsion hinges includes mounting the portion of semiconductor material on a first pair of torsion hinges configured to rotate the portion of semiconductor material about a first axis.
9. The method according to claim 8 further comprising mounting the portion of semiconductor material on a second pair of torsion hinges configured to rotate the portion of semiconductor material about a second axis.
10. The method of claim 9 wherein the first axis is orthogonal to the second axis.
11. The method of claim 1 wherein the reflective surface at the portion of semiconductor material is at least partially transparent to an alignment wavelength of light and reflects traffic wavelengths of light.
12. The method of claim 1 wherein the portion of the semiconductor material configured to be an optical detector is sensitive to an alignment wavelength of light.
13. The method according to claim 1 wherein associating a reflective surface with the semiconductor material includes depositing a dielectric.
14. A beam steering element comprising:
a portion of a semiconductor material configured to be an optical detector and configured to be a movable beam steering element with a reflective surface,
the portion of the semiconductor material configured to be an optical detector being sensitive to an alignment wavelength in an optical beam to provide information about a location being illuminated by the alignment wavelength, the location having a correspondence with the optical beam.
15. The beam steering element of claim 14 wherein the reflective surface is a metal material.
16. The beam steering element of claim 14 wherein the reflective surface is a dielectric material.
17. The beam steering element of claim 14 wherein the optical detector has an n-doped region, a p-doped region, and respective electrical contacts configured to support connection to an electrical circuit.
18. The beam steering element of claim 14 further including torsion hinges and wherein the portion of semiconductor material is coupled to the torsion hinges.
19. The beam steering element of claim 18 wherein the torsion hinges are a first pair of torsion hinges and wherein the portion of semiconductor material is coupled to the first pair of torsion hinges in an arrangement configured to rotate the portion of semiconductor material about a first axis.
20. The beam steering element of claim 19 further comprising a second pair of torsion hinges and wherein the portion of semiconductor material is coupled to the second pair of torsion hinges in an arrangement configured to rotate the portion of semiconductor material about a second axis.
21. The beam steering element of claim 20 wherein the first axis is orthogonal to the second axis.
22. The beam steering element of claim 14 wherein the location has an angular correspondence with the optical beam.
23. The beam steering element of claim 14 wherein the location has an positional correspondence with the optical beam.
24. A beam steering element comprising:
means for detecting information about a location of an alignment wavelength in an optical beam; and
means for movably steering at least a portion of the optical beam at the means for detecting information about a location of an optical beam.