IP Library › Granted Patent US 12,374,855
Granted Patent B2
US 12,374,855 · App. 17/899,277 · Granted Jul 29, 2025

Fiber-coupled laser light source

Inventors: Shashank Gupta (Newton, MA); Michael Gould (Woburn, MA); James Carr (Tewksbury, MA); Nicholas C. Harris (Boston, MA); Sven Mahnkopf (Maple Glen, PA); David Demmer (Toronto, CA)
Assignee: Lightmatter, Inc.
H01S5/02253G02B6/4249H01S5/0064H01S5/0071H01S5/02208H01S5/02251H01S5/02423H01S5/02469H01S5/4025G06F17/16
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Quick Facts
Patent No.
US 12,374,855
App. No.
17/899,277
Granted
Jul 29, 2025
Kind
B2
Abstract

Described herein are photonic sources and related system architectures that can satisfy the optical power requirements of large photonic accelerators. Some embodiments relate to a computer comprising a photonic accelerator configured to perform matrix multiplication; a fiber array optically coupled to the photonic accelerator; and a photonic source optically coupled to the fiber array. The photonic source comprising a laser array comprising a plurality of monolithically co-integrated lasers, and a coupling lens array comprising a plurality of monolithically co-integrated lenses, the coupling lens array optically coupling the laser array to the fiber array. The laser array is configured to output between 0.1 W and 10 W of optical power.

Claims (79)

1. A computer comprising:

a photonic accelerator configured to perform matrix multiplication;

a fiber array optically coupled to the photonic accelerator; and

a photonic source optically coupled to the fiber array, the photonic source comprising:

a laser array comprising a plurality of monolithically co-integrated lasers;

a coupling lens array comprising a plurality of monolithically co-integrated lenses, the coupling lens array optically coupling the laser array to the fiber array; and

a volume Bragg grating (VBG) optically coupled between the laser array and the coupling lens array, the VBG having a passband bandwidth of less than 1 nm.

2. The computer of claim 1 , wherein the laser array is configured to emit between 0.1 W and 10 W of optical power.

3. The computer of claim 1 , wherein the photonic source further comprises a collimating lens array comprising a plurality of monolithically co-integrated lenses, wherein the lenses of the collimating lens array are configured to collimate optical beams emitted by the laser array.

4. The computer of claim 3 , wherein:

at least some of the monolithically co-integrated lasers are vertically offset relative to one another thereby defining a vertical extension,

the collimating lens array defines a mid-array axis with respect to a vertical direction, and

the mid-array axis falls within the vertical extension with respect to the vertical direction.

5. The computer of claim 1 , wherein the optical source further comprises a housing frame defining a first cavity, a second cavity and an enclosed window between the first cavity and the second cavity, wherein the laser array is disposed within the first cavity and the coupling lens array is disposed within the second cavity.

6. The computer of claim 5 , wherein the housing frame further defines a step between the first cavity and the second cavity.

7. The computer of claim 5 , wherein the housing frame is positioned so that optical beams emitted by the laser array pass through the window.

8. The computer of claim 1 , wherein the optical source further comprises a water-cooled heat sink configured to cool the laser array.

9. A computer comprising:

a photonic accelerator configured to perform matrix multiplication;

a fiber array optically coupled to the photonic accelerator; and

a photonic source optically coupled to the fiber array, the photonic source comprising:

a laser array comprising a plurality of monolithically co-integrated lasers;

a coupling lens array comprising a plurality of monolithically co-integrated lenses, the coupling lens array optically coupling the laser array to the fiber array; and

an optical isolator optically coupled between the laser array and the coupling lens array, the optical isolator being configured to permit transmission of a plurality of optical beams emitted by the laser array.

10. The computer of claim 9 , wherein the optical isolator comprises:

a first magnet embedded in a first magnet retainer;

a second magnet embedded in a second magnet retainer; and

a mount joining the first magnet retainer with the second magnet retainer.

11. The computer of claim 10 , wherein the optical isolator further comprises an angled half-wave plate disposed between the first magnet and the second magnet.

12. The computer of claim 10 , wherein the optical isolator further comprises a plate having a rare-earth iron garnet (RIG) film disposed between the first magnet and the second magnet.

13. A computer comprising:

a photonic accelerator configured to perform matrix multiplication;

a fiber array optically coupled to the photonic accelerator; and

a photonic source optically coupled to the fiber array, the photonic source comprising:

a laser array comprising a plurality of monolithically co-integrated lasers;

a coupling lens array comprising a plurality of monolithically co-integrated lenses, the coupling lens array optically coupling the laser array to the fiber array; and

a steering lens array comprising a plurality of monolithically co-integrated lenses, wherein the steering lens array is coupled between the laser array and the coupling lens array and is laterally offset relative to the coupling lens array.

14. The computer of claim 13 , wherein the photonic source further comprises a collimating lens array comprising a plurality of monolithically co-integrated lenses, wherein the lenses of the collimating lens array are configured to collimate optical beams emitted by the laser array.

15. The computer of claim 14 , wherein:

at least some of the monolithically co-integrated lasers are vertically offset relative to one another thereby defining a vertical extension,

the collimating lens array defines a mid-array axis with respect to a vertical direction, and

the mid-array axis falls within the vertical extension with respect to the vertical direction.

16. A method for manufacturing a computer, comprising:

obtaining a photonic accelerator configured to perform matrix multiplication;

obtaining a laser array comprising a plurality of monolithically co-integrated lasers;

obtaining a coupling lens array comprising a plurality of monolithically co-integrated lenses;

assembling a laser source using the laser array and the lens array, wherein assembling the laser source comprises optically aligning the lasers of the laser array with the lenses of the coupling lens array and optically coupling the laser array with a Volume Bragg Grating (VBG) having a passband bandwidth of less than 1 nm; and

optically coupling a first end of a fiber array to the photonic accelerator and optically coupling a second end of the fiber array to the coupling lens array.

17. The method of claim 16 , wherein the laser array is configured to output between 0.1 W and 10 W of optical power.

18. The method of claim 16 , wherein assembling the photonic source further comprises coupling the laser array to a collimating lens array comprising a plurality of monolithically co-integrated lenses, wherein the lenses of the collimating lens array are configured to collimate optical beams emitted by the laser array.

19. The method of claim 16 , wherein assembling the optical source further comprises:

obtaining a housing frame defining a first cavity, a second cavity and an enclosed window between the first cavity and the second cavity, and

positioning the laser array within the first cavity and positioning the coupling lens array within the second cavity.

20. A method for manufacturing a computer, comprising:

obtaining a photonic accelerator configured to perform matrix multiplication;

obtaining a laser array comprising a plurality of monolithically co-integrated lasers;

obtaining a coupling lens array comprising a plurality of monolithically co-integrated lenses;

assembling a laser source using the laser array and the lens array, wherein assembling the laser source comprises optically aligning the lasers of the laser array with the lenses of the coupling lens array optically coupling the laser array to an optical isolator configured to permit transmission of a plurality of optical beams emitted by the laser array; and

optically coupling a first end of a fiber array to the photonic accelerator and optically coupling a second end of the fiber array to the coupling lens array.

21. The method of claim 20 , wherein the optical isolator comprises:

a first magnet embedded in a first magnet retainer;

a second magnet embedded in a second magnet retainer; and

a mount joining the first magnet retainer with the second magnet retainer.

22. The method of claim 21 , wherein the optical isolator further comprises an angled half-wave plate disposed between the first magnet and the second magnet.

23. The method of claim 21 , wherein the optical isolator further comprises a plate having a rare-earth iron garnet (RIG) film disposed between the first magnet and the second magnet.

24. A method for manufacturing a computer, comprising:

obtaining a photonic accelerator configured to perform matrix multiplication;

obtaining a laser array comprising a plurality of monolithically co-integrated lasers;

obtaining a coupling lens array comprising a plurality of monolithically co-integrated lenses;

assembling a laser source using the laser array and the lens array, wherein assembling the laser source comprises optically aligning the lasers of the laser array with the lenses of the coupling lens array and coupling a steering lens array comprising a plurality of monolithically co-integrated lenses between the laser array and the coupling lens array, wherein coupling the steering lens array comprises laterally offsetting the steering lens array relative to the coupling lens array; and

optically coupling a first end of a fiber array to the photonic accelerator and optically coupling a second end of the fiber array to the coupling lens array.

25. A method for manufacturing a computer, comprising:

obtaining a photonic accelerator configured to perform matrix multiplication;

obtaining a laser array comprising a plurality of monolithically co-integrated lasers;

obtaining a coupling lens array comprising a plurality of monolithically co-integrated lenses;

assembling a laser source using the laser array and the lens array, wherein assembling the laser source comprises optically aligning the lasers of the laser array with the lenses of the coupling lens array and coupling the laser array to a collimating lens array comprising a plurality of monolithically co-integrated lenses, wherein the lenses of the collimating lens array are configured to collimate optical beams emitted by the laser array; and

optically coupling a first end of a fiber array to the photonic accelerator and optically coupling a second end of the fiber array to the coupling lens array,

wherein at least some of the monolithically co-integrated lasers are vertically offset relative to one another thereby defining a vertical extension, and the collimating lens array defines a mid-array axis with respect to a vertical direction, and wherein

coupling the laser array to the collimating lens array comprises positioning the mid-array axis within the vertical extension with respect to the vertical direction.

Assignments (4)
TERMINATION OF IP SECURITY AGREEMENT Recorded Nov 5, 2024
From: EASTWARD FUND MANAGEMENT, LLC
To: LIGHTMATTER, INC.
Reel/Frame 069304/0700 →
RELEASE OF SECURITY INTEREST Recorded Mar 31, 2023
From: EASTWARD FUND MANAGEMENT, LLC
To: LIGHTMATTER, INC.
Reel/Frame 063209/0966 →
SECURITY INTEREST Recorded Dec 27, 2022
From: LIGHTMATTER, INC.
To: EASTWARD FUND MANAGEMENT, LLC
Reel/Frame 062230/0361 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 22, 2022
From: GUPTA, SHASHANK; GOULD, MICHAEL; CARR, JAMES; HARRIS, NICHOLAS C.; MAHNKOPF, SVEN; DEMMER, DAVID
To: LIGHTMATTER, INC.
Reel/Frame 061186/0925 →
Continuity (2)
Provisional Application 63239337 · Aug 31, 2021
Related Publication 20230067275A1 · Mar 2, 2023
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