Parallel optical interconnect

• US 5,420,954 A
• Filed: 05/24/1993
• Issued: 05/30/1995
• Est. Priority Date: 05/24/1993
• Status: Expired due to Term

• Current Assignee: Optical Communication Products Incorporated (KOCH Industries Incorporated)
• Original Assignee: Photonic Research (Photonic Electronic Limited)
• Inventors: Uchida, Toshi K., Swirhun, Stanley E.
• Primary Examiner(s): Ullah, Akm E.
• Application Number:
  US08/066,757
• Time in Patent Office: 736 Days
• Field of Search: 385/15, 385/17, 385/78, 385/88, 385/92
• US Class Current: 385/92
• CPC Class Codes: G02B 6/245 Removing protective coverings of light guides before coupling
• CPC Class Codes: G02B 6/42 Coupling light guides with opto-electronic elements
• CPC Class Codes: G02B 6/4202 for coupling an active element with fibres without intermediate optical elements, e.g. fibres with plane ends, fibres with shaped ends, bundles
• CPC Class Codes: G02B 6/421 the intermediate optical component consisting of a short length of fibre, e.g. fibre stub
• CPC Class Codes: G02B 6/4224 using visual alignment markings, e.g. index methods
• CPC Class Codes: G02B 6/4231 with intermediate elements, e.g. rods and balls, between the elements
• 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 6/4246 Bidirectionally operating package structures
• CPC Class Codes: G02B 6/4249 comprising arrays of active devices and fibres
• CPC Class Codes: G02B 6/43 Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections

Abstract

An optical interconnect is disclosed that couples multiple optical fibers to an array of optoelectronic devices. The interconnect includes a multiple optical fiber connector and an optoelectronic board. The multiple fiber connector can be mechanically attached to or detached from the board.

Claims

1. An optoelectronic interconnect comprising:

a multiple optical fiber connector comprising;

a holder having at least one planar surface,

a plurality of optical fibers attached to the holder, each fiber having a first end abutting the first surface so as to expose the first end for receiving or transmitting optical radiation, said first ends of said fibers forming a fiber array having a first pattern, and

guiding means disposed in said holder at predetermined positions with respect to said fiber array; and

an optoelectronic board comprising;

a substrate having a first surface and first aligning means,

an optoelectronic device array monolithically formed on a first surface of a semiconductor chip, said optoelectronic device array having substantially the same pattern as the first pattern of said fiber array, said chip being disposed on the substrate,

second aligning means for aligning said array of optoelectronic devices to said first aligning means,

said first aligning means being disposed at substantially the same predetermined positions with respect to said array of optoelectronic devices as the positions of the guiding means relative to said fiber array, and

said first aligning means receiving said guiding means so as to mechanically align said optoelectronic device array with said fiber array, whereby each optoelectronic device is aligned to an optical fiber, said optoelectronic device array emitting optical radiation into said optical fiber array or receiving optical radiation from said fiber array.

2. The interconnect of claim 1 wherein said second aligning means comprises solder formed between two sets of identical metallic patterns, one formed on a second surface of the semiconductor wafer and the other formed on the first surface of the substrate.

3. The interconnect of claim 1 wherein said guiding means comprises two guiding pins mounted in the holder, said pins extending through said first planar surface of the holder, and said first aligning means comprises two aligning holes, the fiber array being aligned to the array of optoelectronic devices by aligning and engaging said pins with said holes.

4. The interconnect of claim 3 wherein said fiber array is disposed between the two guiding pins.

5. The interconnect of claim 1 wherein said guiding means comprises two pins mounted in the holder, said pins extending through said first planar surface of the holder in a direction perpendicular to said first surface, and said aligning means comprises two aligning holes, said fiber array being aligned to said array of optoelectronic devices by aligning and engaging said pins with said holes.

6. The interconnect of claim 5 wherein said fiber array is disposed between the two pins.

7. The interconnect of claim 1 wherein the fibers form a two-dimensional array.

8. The interconnect of claim 1 wherein the fibers form a one-dimensional array.

9. The interconnect of claim 8 wherein the fibers are plastic optical fibers.

10. The interconnect of claim 8 wherein the fibers are single mode optical fibers.

11. The interconnect of claim 8 wherein each of the optical fibers is a multi-mode optical fiber.

12. The interconnect of claim 11 wherein the multi-mode optical fiber has a core diameter of approximately 6.5 μ

m.

13. The interconnect of claim 12 wherein the array of optoelectronic devices comprises an one-dimensional array of vertical cavity surface emitting lasers, each laser being axially aligned to an end of a fiber and the fibers receiving optical radiation emitted by the lasers.

14. The interconnect of claim 12 further comprising a first electronic circuit means interconnected to the laser array for driving and modulating said lasers.

15. The interconnect of claim 14 wherein each of the vertical cavity surface emitting lasers has a diameter of approximately 20 μ

m.

16. The interconnect of claim 11 wherein the array of optoelectronic devices comprises an one-dimensional array of photo-detectors, each photo-detector being axially aligned to an end of a fiber, and the detectors receiving optical radiation emitted by the lasers.

17. The interconnect of claim 16 further comprising a second electronic means for receiving electronic signals from said photo-detectors.

18. The interconnect of claim 16 wherein the photo-detectors are Schottky-barrier photo-detectors.

19. The interconnect of claim 16 wherein each of the optical fibers is a multi-mode optical fiber.

20. The interconnect of claim 19 wherein the multi-mode optical fiber has a diameter of approximately 6.5 μ

m.

21. The interconnect of claim 20 wherein each of the photo-detectors has a diameter of approximately 100 μ

m.

23. The interconnect of claim 12 wherein the array of optoelectronic devices comprises an one-dimensional array of super luminescence diodes, each diode being axially aligned to an end of a fiber and the fibers receiving optical radiation emitted by the diodes.

22. A method for interconnecting an optical connector with an optoelectronic board comprising the steps of:

providing a multiple optical fiber connector, said connector comprising;

a holder having at least one planar surface,

a plurality of optical fibers attached to the holder, each fiber having a first end abutting the first surface so as to expose the first end for receiving or transmitting optical radiation, said first ends of said fibers forming a fiber array having a first pattern, and

guiding means disposed in said holder at predetermined positions with respect to said fiber array;

providing an optoelectronic board, said board comprising;

a substrate having a first surface and a first aligning means,

an array of optoelectronic devices monolithically formed on a first surface of a semiconductor chip, said optoelectronic devices having substantially the same pattern as the first pattern of said fiber array, said wafer being disposed on the substrate,

second aligning means for aligning said array of optoelectronic devices to said first aligning means,

said first aligning means being disposed at substantially the same predetermined positions with respect to said array of optoelectronic devices as the positions of the guiding means relative to said fiber array; and

aligning and engaging said guiding means of said connector with said first aligning means so as to mechanically align said array of optoelectronic devices with said fiber array, whereby each optoelectronic device is aligned to an end of a fiber, said array of optoelectronic devices emitting optical radiation into said fiber array or receiving optical radiation emitted from said fiber array.