Patent ID: 11894658
Assignee: VIXAR, INC.
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 14:
15. A VCSEL device comprising:
a VCSEL chip, the VCSEL chip having a center point and a top surface, and
a photodiode, the photodiode having a center point, wherein the VCSEL chip and the photodiode arranged on a submount such that the center point of the VCSEL chip is separated from the center point of the photodiode by a first distance;
wherein the VCSEL chip and photodiode are housed in a package, the package having:
a window configured and arranged to allow light emitted from the VCSEL chip to pass through the window;
a spacer arranged between the submount and the window; and
a diffuser arranged on a surface of the window and extending over a majority of the surface, and being arranged at a height of a second distance above the top surface of the VCSEL chip, wherein the second distance is less than the first distance,

wherein light emitted by the VCSEL chip travels in three manners:
a portion of the light is transmitted through the diffuser and through the window;
a portion of the light is repeatedly scattered and reflected within the diffuser parallel to a plane of the window; and
a portion of the light is scattered by the diffuser back into the package and to the photodiode.