Apparatus providing simplified alignment of optical fiber in photonic integrated circuits

• US 10,656,354 B2
• Filed: 03/26/2018
• Issued: 05/19/2020
• Est. Priority Date: 01/02/2013
• Status: Active Grant

• Current Assignee: Micron Technology, Inc.
• Original Assignee: Micron Technology, Inc.
• Inventors: Sandhu, Gurtej, Meade, Roy, Bi, Lei, Smythe, John
• Primary Examiner(s): Lepisto, Ryan A
• Assistant Examiner(s): Chiem, Erin D
• Application Number:
  US15/936,033
• Publication Number:
  US 20180224614A1
• Time in Patent Office: 785 Days
• CPC Class Codes: G02B 6/30 for use between fibre and thin-film device
• CPC Class Codes: G02B 6/32 having lens focusing means positioned between opposed fibre ends with lens being an integral part of the single fibre end G02B6/262
• CPC Class Codes: G02B 6/4204 the coupling comprising intermediate optical elements, e.g. lenses, holograms encapsulated active devices H01S5/02208, H01L33/52
• CPC Class Codes: G02B 6/4206 Optical features G02B6/4207, G02B6/421 take precedence
• CPC Class Codes: G02B 6/4225 by a direct measurement of the degree of coupling, e.g. the amount of light power coupled to the fibre or the opto-electronic element
• CPC Class Codes: G02B 6/4226 Positioning means for moving the elements into alignment, e.g. alignment screws, deformation of the mount
• CPC Class Codes: G02B 6/4227 Active alignment methods, e.g. procedures and algorithms
• CPC Class Codes: G02B 6/4239 Adhesive bonding; Encapsulation with polymer material
• CPC Class Codes: Y10T 29/42 Piezoelectric device making
• CPC Class Codes: Y10T 29/49 Method of mechanical manufacture

Abstract

A structure for optically aligning an optical fiber to a photonic device and method of fabrication of same. The structure optically aligns an optical fiber to the photonic device using a lens between the two which is moveable by actuator heads. The lens is moveable by respective motive sources associated with the actuator heads.

Claims

1. An optical alignment structure comprising:

a lens configured to receive an optical signal from an optical emitter and to direct the light signal to an optical receiver;

a plurality of actuator heads configured to engage the lens and to move the lens independently in each of three mutually-orthogonal directions; and

a motive source associated with the plurality of actuator heads for causing movement of the lens.

2. The optical alignment system of claim 1, wherein the plurality of actuator heads, the motive source, and at least one of the optical emitter or the optical receiver are part of an integrated photonic chip.

3. The optical alignment structure of claim 1, wherein the motive source comprises first, second and third motive sources, each associated with a respective one of the plurality of actuator heads for causing movement of the lens.

4. The optical alignment structure of claim 1, wherein the motive source comprises a piezoelectric structure for causing movement of at least one of the plurality of actuator heads.

5. The optical alignment structure of claim 1, wherein first and second ones of the plurality of actuator heads are each provided with a downwardly sloping inclined area engaging with a lower portion of the lens.

6. The optical alignment structure of claim 5, wherein the first and second ones of the plurality of actuator heads are spaced apart and positioned on opposite sides of a bottom of the lens such that the lens engages with the inclined areas of the first and second ones of the plurality of actuator heads.

7. The optical alignment structure of claim 6, wherein the first and second ones of the plurality of actuator heads cause the lens to move in an upward direction when the first and second ones of the plurality of actuator heads are moved towards one another and cause the lens to move in a downward direction when the first and second ones of the plurality of actuator heads are moved away from one another.

8. The optical alignment structure of claim 6, wherein the first and second ones of the plurality of actuator heads cause the lens to move in a leftward direction when the first and second ones of the plurality of actuator heads move in leftward direction and cause the lens to move in a rightward direction when the first and second ones of the plurality of actuator heads move in a rightward direction.

9. The optical alignment structure of claim 1, further comprising a control system for operating the motive source to cause movement of the plurality of actuator heads.

10. The optical alignment structure of claim 9, wherein the control system receives a signal representing the amount of light received by the optical receiver and operates the motive source to cause movement of the lens to a position which obtains optical alignment of the optical emitter and the optical receiver.

11. The optical alignment structure of claim 10, wherein the control system periodically monitors the light received by the optical receiver and, if the received light is not within a tolerance range, operates the motive source to cause movement of the lens to a position which increases the amount of light received by the optical receiver.

12. The optical alignment structure of claim 1, wherein the optical emitter is an optical fiber and the optical receiver is a photonic device.

13. The optical alignment structure of claim 12, wherein the photonic device is a waveguide.

14. The optical alignment structure of claim 1, wherein the optical emitter is a photonic device and the optical receiver is an optical fiber.

15. The optical alignment structure of claim 14, wherein the photonic device is a waveguide.

16. The optical alignment structure of claim 1, wherein the three mutually-orthogonal directions comprise an up-down direction, a left-right direction, and a forward-back direction.

17. An optical alignment structure comprising:

a lens configured to receive an optical signal from an optical emitter and to direct the light signal to an optical receiver;

a plurality of actuator heads engaging the lens and configured to move the lens independently in each of three mutually-orthogonal directions;

a plurality of cantilever arms for respectively supporting the plurality of actuator heads;

a plurality of motive sources respectively associated with each cantilever arm; and

a control system for controlling the motive sources to effect movement of the lens through the actuator heads.

18. The optical alignment structure of claim 17, wherein one of the optical emitter and the optical receiver comprises a photonic device and the other of the optical emitter and the optical receiver comprises an optical fiber.

19. The optical alignment structure of claim 17, wherein the motive sources comprise piezoelectric structures.

20. The optical alignment structure of claim 17, wherein the lens, actuator heads, cantilever arms, motive sources, and at least one of the optical emitter or the optical receiver are fabricated on a common integrated circuit chip.

21. The optical alignment structure of claim 20, wherein the control system is fabricated on the common integrated circuit chip.

22. The optical alignment structure of claim 17, further comprising a signal detector for receiving a light signal from the optical receiver, the control system receiving and acting on the light signal to control the motive sources.

23. The optical alignment structure of claim 17, wherein the optical emitter is an optical fiber and the optical receiver is a photonic device.

24. The optical alignment structure of claim 23, wherein the photonic device is a waveguide.

25. The optical alignment structure of claim 17, wherein the optical emitter is a photonic device and the optical receiver is an optical fiber.

26. The optical alignment structure of claim 25, wherein the photonic device is a waveguide.

27. The optical alignment structure of claim 17, wherein the three mutually-orthogonal directions comprise an up-down direction, a left-right direction, and a forward-back direction.