Emitter array with variable spacing between adjacent emitters

• US 10,714,903 B2
• Filed: 06/28/2019
• Issued: 07/14/2020
• Est. Priority Date: 09/26/2017
• Status: Active Grant

• Current Assignee: Lumentum Operations, LLC (Lumentum Holdings Inc.)
• Original Assignee: Lumentum Operations, LLC (Lumentum Holdings Inc.)
• Inventors: Yuen, Albert, Barve, Ajit Vijay
• Primary Examiner(s): Rodriguez, Armando
• Application Number:
  US16/456,480
• Publication Number:
  US 20190326732A1
• Time in Patent Office: 382 Days
• CPC Class Codes: H01S 5/024 Arrangements for thermal management
• CPC Class Codes: H01S 5/02461 Structure or details of the laser chip to manipulate the heat flow, e.g. passive layers in the chip with a low heat conductivity
• CPC Class Codes: H01S 5/026 Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers stabilisation of output H01S5/06
• CPC Class Codes: H01S 5/0425 Electrodes, e.g. characterised by the structure
• CPC Class Codes: H01S 5/04256 characterised by the configuration
• CPC Class Codes: H01S 5/18311 using selective oxidation
• CPC Class Codes: H01S 5/423 having a vertical cavity

Abstract

In some implementations, a VCSEL array may include a plurality of VCSELs that each operates concurrently and emits light at a same wavelength. A first distance between a first pair of adjacent VCSELs, of the plurality of VCSELs, may be different from a second distance between a second pair of adjacent VCSELs of the plurality of VCSELs. The first pair of adjacent VCSELs may be located closer to a center of the VCSEL array than the second pair of adjacent VCSELs. At least one of temperature non-uniformity or optical power non-uniformity among the plurality of VCSELs may be reduced as compared to another VCSEL array, with a same physical footprint as the VCSEL array, comprising uniformly spaced VCSELs.

Claims

1. An emitter array, comprising:

a plurality of emitters that operate concurrently and emit laser beams at a substantially same wavelength,

where an average distance of at least four emitters, of the plurality of emitters, that are adjacent to a first emitter is a first distance,

where an average distance of at least four other emitters, of the plurality of emitters, that are adjacent to a second emitter is a second distance,

where the first emitter is different than the second emitter,

where the first distance is greater than the second distance, and

where an average distance of at least four additional emitters, of the plurality of emitters, that are adjacent to a third emitter is a third distance.

2. The emitter array of claim 1, where the at least four emitters are located closer to a center of the emitter array than the at least four other emitters.

3. The emitter array of claim 1, where the third distance is less than the second distance.

4. The emitter array of claim 1, where the plurality of emitters have a same aperture size.

5. The emitter array of claim 1, where the first distance between the at least four emitters is a linear function of a distance between a center of the emitter array and the at least four emitters.

6. The emitter array of claim 1, where the first distance between the at least four emitters is a parabolic function of a distance between a center of the emitter array and the at least four emitters.

7. A vertical cavity surface emitting laser (VCSEL) array, comprising:

a plurality of VCSELs that operate concurrently and emit laser beams at a substantially same wavelength,

where each VCSEL, of the plurality of VCSELs, is associated with a first coordinate and a second coordinate,

where the first coordinate is associated with a first function of a distance of a respective VCSEL to a center of the array,

where the second coordinate is associated with a second function of the distance of the respective VCSEL to the center of the array, and

where the first function is different than the second function.

8. The VCSEL array of claim 7, where a first distance between a first pair of adjacent VCSELs, of the plurality of VCSELs, is different from a second distance between a second pair of adjacent VCSELs of the plurality of VCSELs,

the first pair of adjacent VCSELs being located closer to a center of the VCSEL array than the second pair of adjacent VCSELs.

9. The VCSEL array of claim 8, where the first distance is greater than the second distance.

10. The VCSEL array of claim 7, where a distance between a pair of adjacent VCSELs, of the plurality of VCSELs, is based on a distance between a center of the VCSEL array and the pair of adjacent VCSELs.

11. The VCSEL array of claim 10, where the distance between the pair of adjacent VCSELs varies linearly based on the distance between the center of the VCSEL array and the pair of adjacent VCSELs.

12. The VCSEL array of claim 10, where the distance between the pair of adjacent VCSELs varies parabolically based on the distance between the center of the VCSEL array and the pair of adjacent VCSELs.

13. The VCSEL array of claim 7, where at least two VCSELs, of the plurality of VCSELs, have different aperture sizes.

20. The VCSEL array of claim 7, where a first axis for the first coordinate is orthogonal to a second axis for the second coordinate.

14. A vertical cavity surface emitting laser (VCSEL) array, comprising:

a plurality of VCSELs that each operate concurrently and emits light at a substantially same wavelength,

where a first distance between a first pair of adjacent VCSELs, of the plurality of VCSELs, is different from a second distance between a second pair of adjacent VCSELs of the plurality of VCSELs,

the first pair of adjacent VCSELs being located closer to a center of the VCSEL array than the second pair of adjacent VCSELs,

where the VCSEL array is an M×

N array and both M and N are greater than 1, and

where the first distance is a function of a distance between a center of the VCSEL array and the first pair of adjacent VCSELs.

15. The VCSEL array of claim 14, where a difference between the first distance and the second distance is associated with reducing a difference in at least one of an operating temperature between the first pair of adjacent VCSELs and the second pair of adjacent VCSELs or an optical power output between the first pair of adjacent VCSELs and the second pair of adjacent VCSELs.

16. The VCSEL array of claim 14, where the first distance is greater than the second distance.

17. The VCSEL array of claim 14, where a distance between a pair of adjacent VCSELs, of the plurality of VCSELs, is based on a distance between the center of the VCSEL array and the pair of adjacent VCSELs.

18. The VCSEL array of claim 14, where the plurality of VCSELs have a same aperture size.

19. The VCSEL array of claim 14, where at least two VCSELs, of the plurality of VCSELs, have different aperture sizes.