Emitter array with variable spacing between adjacent emitters

• US 10,355,456 B2
• Filed: 09/26/2017
• Issued: 07/16/2019
• 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:
  US15/716,139
• Publication Number:
  US 20190097397A1
• Time in Patent Office: 658 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. A vertical cavity surface emitting laser (VCSEL) array, comprising:

a plurality of VCSELs that each operates 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 quadratic function of a distance between a center of the VCSEL array and the first pair of adjacent VCSELs.

2. The VCSEL array of claim 1, where the first distance is greater than the second distance.

3. The VCSEL array of claim 1, where a difference between the first distance and the second distance is associated with reducing a difference in operating temperature between the first pair of adjacent VCSELs and the second pair of adjacent VCSELs.

4. The VCSEL array of claim 1, where a difference between the first distance and the second distance is associated with reducing a difference in optical power output between the first pair of adjacent VCSELs and the second pair of adjacent VCSELs.

5. The VCSEL array of claim 1, 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.

6. The VCSEL array of claim 5, 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.

7. The VCSEL array of claim 5, 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.

8. The VCSEL array of claim 1, where the plurality of VCSELs have a same aperture size.

9. The VCSEL array of claim 1, where at least two VCSELs, of the plurality of VCSELs, have different aperture sizes.

10. An emitter array, comprising:

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

where a distance between adjacent emitters, of the plurality of emitters, is based on a distance between a center of the emitter array and the adjacent emitters,

where a first distance between first adjacent emitters, of the plurality of emitters, is different from a second distance between second adjacent emitters of the plurality of emitters, and

where a third distance between third adjacent emitters, of the plurality of emitters, is different from the first distance and the second distance.

11. The emitter array of claim 10, where the first adjacent emitters are located closer to the center of the emitter array than the second adjacent emitters, and where the first distance is greater than the second distance.

12. The emitter array of claim 10, where the distance between the adjacent emitters is a linear function of the distance between the center of the emitter array and the adjacent emitters.

13. The emitter array of claim 10, where the distance between the adjacent emitters is a parabolic function of the distance between the center of the emitter array and the adjacent emitters.

20. The emitter array of claim 10, where the distance between adjacent emitters varies linearly or parabolically based on the distance between the center of the emitter array and the adjacent emitters.

14. A laser array, comprising:

a plurality of vertical emitting devices with variable spacing between different pairs of adjacent vertical emitting devices,

where the plurality of vertical emitting devices operate concurrently to produce light at a substantially same wavelength,

where a first distance between first adjacent vertical emitting devices, of the plurality of vertical emitting devices, is different from a second distance between second adjacent vertical emitting devices of the plurality of vertical emitting devices, and

where a third distance between third adjacent vertical emitting devices, of the plurality of vertical emitting devices, is different from the first distance and the second distance.

15. The laser array of claim 14, where temperature non-uniformity among the plurality of vertical emitting devices is reduced as compared to another laser array, with a same physical footprint as the laser array, comprising uniformly spaced vertical emitting devices.

16. The laser array of claim 14, where optical power non-uniformity among the plurality of vertical emitting devices is reduced as compared to another laser array, with a same physical footprint as the laser array, comprising uniformly spaced vertical emitting devices.

17. The laser array of claim 14, where a first spacing, for a first pair of adjacent vertical emitting devices located closer to the center of the laser array, is greater than a second spacing for a second pair of adjacent vertical emitting devices located farther from the center of the laser array.

18. The laser array of claim 14, where a spacing for a pair of adjacent vertical emitting devices, of the plurality of vertical emitting devices, is a function of a distance between a center of the laser array and the pair of adjacent vertical emitting devices.

19. The laser array of claim 18, where the function is a linear function or a parabolic function.