Passive optical alignment

• US 9,551,844 B2
• Filed: 01/11/2011
• Issued: 01/24/2017
• Est. Priority Date: 01/11/2011
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Inventors: Tan, Michael Renne Ty, Mathai, Sagi Varghese, Rosenberg, Paul Kessler, Panotopoulos, Georgios, Fattal, David A., Sorin, Wayne V.
• Primary Examiner(s): Wong, Tina
• Application Number:
  US13/995,492
• Publication Number:
  US 20130266255A1
• Time in Patent Office: 2,205 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G02B 6/42 Coupling light guides with opto-electronic elements
• CPC Class Codes: G02B 6/423 using guiding surfaces for the alignment
• CPC Class Codes: G02B 6/4232 using the surface tension of fluid solder to align the elements, e.g. solder bump techniques flip-chip mounting techniques in assembly of semiconductor devices H01L24/81
• CPC Class Codes: G02B 6/4249 comprising arrays of active devices and fibres
• CPC Class Codes: G02B 6/4259 of the transparent type
• CPC Class Codes: G02B 6/428 containing printed circuit boards [PCB]
• CPC Class Codes: G02B 6/4292 the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

A system for passive optical alignment includes an through optical via formed through a substrate, an optical transmission medium secured to a first side of the substrate such that the optical transmission medium is aligned with the through optical via, and an optoelectronic component secured to a second side of the substrate such that the active region of said optoelectronic component is aligned with the through optical via.

Claims

1. A system for passive optical alignment comprising:

a through optical via formed through a substrate, said optical via comprising an open center providing an open passageway through said substrate and inner walls coated with a material having a lower index of refraction than the passageway;

an optical transmission medium secured to a first side of said substrate such that said optical transmission medium is aligned with said through optical via;

an optoelectronic component secured to a second side of said substrate such that said an active region of said optoelectronic component is aligned with said through optical via;

a circuit board for said optoelectronic component; and

a heat sink on which said optoelectronic component is disposed, said circuit board surrounding said heat sink.

2. The system of claim 1, further comprising:

a first set of bond pads disposed on said second side of said substrate;

a second set of bond pads disposed onto said optoelectronic component, said second set of bond pads being spatially identical to said first set of bond pads;

wherein upon reflowing solder bumps between said first set of bond pads and said second set of bond pads, said optoelectronic component is brought into alignment with said through optical via.

3. The system of claim 1, further comprising:

a set of spheres secured to a mechanical connector of said optical transmission medium; and

a set of hemispheric holes spatially positioned identically to a positioning of said spheres.

4. The system of claim 3, wherein a diameter of said holes is such that placement of said spheres into said holes aligns said optical transmission medium with said through optical via.

5. The system of claim 1, further comprising a number of additional through optical vias through said substrate, said additional through optical vias to pass light between additional active regions of said optoelectronic component secured to said substrate and additional transmission media.

6. The system of claim 2, further comprising transmission and receiving circuitry electrically connected to said optoelectronic component through at least one of said bond pads on said substrate.

7. The system of claim 1, in which said optical transmission medium is secured to said substrate by a pin and hole mechanism.

8. The system of claim 1, further comprising:

solder bumps comprising connecting the optoelectronic component to the substrate; and

a signal pathway between said optoelectronic component and a processing module, the signal pathway comprising one or more of the solder bumps.

9. The system of claim 1, wherein the passageway is at vacuum.

10. The system of claim 1, wherein the passageway is filled with air.

11. The system of claim 1, wherein the passageway is filled with an inert gas.

12. A method for passive optical alignment, the method comprising:

forming a through optical via through a substrate, the optical via having an open center extending through the substrate;

securing a receiving end of an optical transmission medium directly one end of said open-center optical via and to a first side of said substrate such that said optical transmission medium is aligned with said through optical via;

securing an optoelectronic component to a second side of said substrate such that an active region of said optoelectronic component is aligned with said open-center optical via;

providing a circuit board for said optoelectronic component; and

disposing said optoelectronic component on a heat sink, said circuit board surrounding said heat sink.

13. The method of claim 12, wherein securing said optoelectronic component to a second side of said substrate comprises:

forming a first set of bond pads on said second side of said substrate; and

forming a second set of bond pads onto said optoelectronic component, said second set of bond pads being spatially identical to said first set of bond pads;

wherein upon reflowing solder bumps between said first set of bond pads and said second set of bond pads, said active region of said optoelectronic component is brought into alignment with said through optical via; and

routing a signal from said optoelectronic component to a processing module through one or more of said solder bumps.

14. The method of claim 12, further comprising:

disposing a set of spheres onto a terminal of said optical transmission medium; and

disposing a set of hemispheric holes spatially identical to said spheres, a diameter of said holes being such that placement of said spheres into said holes aligns said optical transmission medium to said through optical via.

15. The method of claim 12, wherein said through optical via comprises a gas-filled passageway disposed between reflective walls.

16. The method of claim 12, further comprising a number of additional through optical vias through said substrate, said additional through optical vias to pass light between additional active regions of said optoelectronic component secured to said substrate and additional transmission media.

17. An optical system comprising:

a first set of bond pads disposed on a first side of a substrate;

a through optical via formed through said substrate;

a second set of bond pads disposed on an optoelectronic component, said second said of bond pads being spatially identical to said first set of bond pads;

solder bumps disposed between said first set of bond pads and said second set of bond pads to align an active region of said optoelectronic component to said through optical via;

a processing module, wherein a signal path between the optoelectronic component and the processing module comprises at least one of the solder bumps;

a coupling mechanism to secure an optical transmission medium to a second side of said substrate such that said optical transmission medium is aligned with said through optical via;

a circuit board for said optoelectronic component; and

a heat sink on which said optoelectronic component is disposed, said circuit board surrounding said heat sink,

wherein said through optical via allows light to pass between said optoelectronic component and said optical transmission medium.

18. The system of claim 17, wherein said through optical via comprises a transparent dielectric material disposed between reflective walls.

19. The system of claim 17, wherein said through optical via is one of:

an expanding waveguide, parabolic expanding waveguide, and a parabolic contracting waveguide.