Optical assembly with passive alignment

1. An optical assembly having x, y and z axes and comprising:

a first substrate having a planar surface, a first wall adjacent and substantially perpendicular to said planar surface, a first register surface adjacent said first wall, at least one foundation to receive an optical element having a first optical axis at least partially along said z axis, wherein said foundation comprises a groove, wherein said first register surface comprises a portion of said groove adjacent said first wall;

said optical element having a periphery which contacts said groove to position said optical element in said groove, said periphery having a certain shape;

an opto-electrical device (OED) having a top surface, an active area on said top surface having a second optical axis normal to said top surface, and a first alignment element defined on said top surface, said OED abutting said first wall such that said first alignment element extends beyond said first wall and contacts said first register surface to position said OED on said first substrate along at least one of said x or y axes with said second optical axis parallel to said planar surface, wherein said first alignment element has a periphery having said certain shape such that said first alignment element is positioned in said groove along the x and y axes essentially the same as said optical element.

2. The optical assembly of claim 1 , wherein said optical element is an optical conduit and said foundation is a groove extending from said first wall to an edge of said first substrate.

3. The optical assembly of claim 2 , wherein said first register surface comprises at least a portion of said foundation.

4. The optical assembly of claim 3 , wherein said optical conduit is a fiber.

5. The optical assembly of claim 4 , wherein said optical assembly further comprises said fiber disposed in said foundation.

6. The optical assembly of claim 1 , wherein said first substrate defines a second register surface adjacent said first wall, and said top surface comprises at least a second alignment element for contacting said second register surface to position said OED along said z axis.

7. The optical assembly of claim 6 , wherein said second register surface is a portion of said first wall, and wherein said second alignment element is at least one surface on or adjacent said planar surface such that said at least one surface contacts said wall to position said OED along the z axis.

8. The optical assembly of claim 1 , wherein said first substrate defines a cavity in which one side is defined by said first wall.

9. The optical assembly of claim 8 , wherein said cavity is configured to receive said OED snugly such that at least one surface on or adjacent said top surface urges against said first wall.

10. The optical assembly of claim 8 , wherein said cavity is configured to receive said OED with tolerance, and wherein said OED comprises at least one urging member on the opposite side of said top surface to urge said at least one surface against said first wall.

11. The optical assembly of claim 10 , wherein said at least one urging member comprises a compliant material.

12. The optical assembly of claim 10 , wherein said at least one urging member comprises a wedge-like member.

13. The optical assembly of claim 1 , wherein said first alignment element is adjacent said active area on said top surface.

14. The optical assembly of claim 1 , wherein said first alignment element protrudes from said top surface.

15. The optical assembly of claim 14 , wherein said active area protrudes upward from said top surface, and said first alignment element is defined on an edge of said active area.

16. The optical assembly of claim 2 , wherein said first alignment element protrudes from said top surface and seats in said groove to position said OED along said x and y axes.

17. The optical assembly of claim 16 , wherein said certain shape is a semicircle.