Eye-safe optical laser system

Patent metadata

Field	Value
Publication number	US-11075695-B2
Application number	US-202016840030-A
Country	US
Kind code	B2
Filing date	Apr 3, 2020
Priority date	Feb 17, 2009
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

High power, high speed VCSEL arrays are employed in unique configurations of arrays and sub-arrays. Placement of a VCSEL array behind a lens allows spatial separation and directivity. Diffusion may be employed to increase alignment tolerance. Intensity modulation may be performed by operating groups of VCSEL emitters at maximum bias. Optical communications networks with high bandwidth may employ angular, spatial, and/or wavelength multiplexing. A variety of network topologies and bandwidths suitable for the data center may be implemented. Eye safe networks may employ VCSEL emitters may be paired with optical elements to reduce optical power density to eye safe levels.

First claim

What is claimed:

1. An eye safe optical laser system, comprising:
a plurality of laser emitter clusters,
wherein each laser emitter cluster, of the plurality of laser emitter clusters, comprises a plurality of laser emitters, and
wherein each laser emitter, of the plurality of laser emitters, is configured to emit a laser beam carrying data;

an optical element shaped as a clear planar surface having a first side and a second side,
wherein the optical element is configured to:
receive laser beams, from the plurality of laser emitters, at the first side, and
output diffuse cones, corresponding to the laser beams, over an area of the second side sufficient to reduce power densities of the laser beams to an eye safe level,
wherein a first set of the diffuse cones correspond to a first laser emitter cluster of the plurality of laser emitter clusters, and
wherein a second set of the diffuse cones correspond to a second laser emitter cluster of the plurality of laser emitter clusters; and

a lens configured to:
receive the diffuse cones from the optical element,
combine the first set of the diffuse cones,
output a first semi-collimated disc of light based on combining the first set of the diffuse cones,
combine the second set of the diffuse cones, and
output a second semi-collimated disc of light based on combining the second set of the diffuse cones,
wherein the second semi-collimated disc of light is configured to be output from the lens at a different angle than the first semi-collimated disc of light.

2. The eye safe optical laser system of claim 1 , wherein the optical element is located on or in a table top.

3. The eye safe optical laser system of claim 1 , wherein the diffuse cones deliver a wide beam of data to one or more receivers.

4. The eye safe optical laser system of claim 1 , wherein the optical element is mounted on or in a wall or ceiling.

5. The eye safe optical laser system of claim 1 , further comprising an optical filter coupled to a receiver.

6. The eye safe optical laser system of claim 5 , wherein one or more of the laser emitter clusters are polarized and the optical filter is polarized.

7. The eye safe optical laser system of claim 1 , further comprising a window filter blocking transmission of wavelengths associated with the plurality of laser emitter clusters.

8. The eye safe optical laser system of claim 1 , wherein the optical element is a transmitter.

9. The eye safe optical laser system of claim 8 , further comprising a protective element for placement over the transmitter.

10. The eye safe optical laser system of claim 9 , wherein the protective element is located on or in a table top.

11. The eye safe optical laser system of claim 9 , wherein the protective element is mounted on or in a wall or ceiling.

12. The eye safe optical laser system of claim 1 , further comprising:
one or more receivers for receiving the first semi-collimated disc of light and the second semi-collimated disc of light,
wherein the first semi-collimated disc of light and the second semi-collimated disc of light each deliver a wide beam of data to the one or more receivers.

13. The eye safe optical laser system of claim 12 , further comprising:
an optical filter coupled to the one or more receivers,
wherein the plurality of laser emitter clusters are polarized and the optical filter is polarized.

14. The eye safe optical laser system of claim 12 , further comprising a window filter blocking transmission of wavelengths associated with the plurality of laser emitter clusters.

15. An eye safe optical laser system, comprising:
a first surface;
a cluster of laser detectors connected to the first surface;
a second surface; and
an optical switch connected to the second surface, the optical switch comprising:
a plurality of laser emitter clusters,
wherein each laser emitter cluster, of the plurality of laser emitter clusters, comprises a plurality of laser emitters, and
wherein each laser emitter, of the plurality of laser emitters, is configured to emit a laser beam carrying data;

at least one optical element configured to receive laser beams from the plurality of laser emitters and output a beam striking the cluster of laser detectors,
wherein the at least one optical element is shaped as a clear planar surface having a first side and a second side, and is configured to:
receive the laser beams at the first side, and
output diffuse cones, corresponding to the laser beams, over an area of the second side sufficient to reduce a power density of the laser beams to an eye safe level,
 wherein a first set of the diffuse cones correspond to a first laser emitter cluster of the plurality of laser emitter clusters, and
 wherein a second set of the diffuse cones correspond to a second laser emitter cluster of the plurality of laser emitter clusters;

a lens configured to:
receive the diffuse cones from the optical element,
combine the first set of the diffuse cones,
output a first semi-collimated disc of light based on combining the first set of the diffuse cones,
combine the second set of the diffuse cones, and
output a second semi-collimated disc of light based on combining the second set of the diffuse cones,
wherein the second semi-collimated disc of light is configured to be output from the lens at a different angle than the first semi-collimated disc of light; and

circuitry configured to transmit information to the cluster of laser detectors by driving the plurality of laser emitter clusters.

16. The eye safe optical laser system of claim 15 , wherein the first surface and the second surface are interior to an equipment rack.

17. The eye safe optical laser system of claim 15 , wherein the first surface is located on a first equipment rack and the second surface is located on a second equipment rack.

18. The eye safe optical laser system of claim 15 , wherein the first surface is located above an equipment rack.

19. The eye safe optical laser system of claim 15 , wherein the optical switch is a transceiver.

20. The eye safe optical laser system of claim 1 , wherein the lens is configured to transmit data via multiple channels.

Assignees

• Lumentum Operations Llc

Inventors

• Joseph John R
• Lear Kevin L
• Abell David

Classifications

• H01S5/005 Primary

  Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping (H01S5/026, H01S5/18388 take precedence) · CPC title

• H01S5/02325

  Mechanically integrated components on mount members or optical micro-benches · CPC title

• H01S5/50

  Amplifier structures not provided for in groups H01S5/02 - H01S5/30 · CPC title

• H01S5/06226

  Modulation at ultra-high frequencies · CPC title

• H04B10/503

  Laser transmitters · CPC title