Method of optical aperture integration for producing symmetric irradiance pattern
Aspects of the disclosure provide an optical communication system. The system may include a receiver lens system configured to receive a light beam from a remote optical communication system and direct the light beam to a photodetector. The system may also include the photodetector. The photodetector may be configured to convert the received light beam into an electrical signal, and the photodetector may be positioned at a focal plane of the receiver lens system. The system may also include a phase-aberrating element arranged with respect to the receiver lens system and the photodetector such that the phase-aberrating element is configured to provide uniform angular irradiance at the focal plane of the receiver lens system.
1. An optical communication system comprising:
a receiver lens system configured to receive a light beam and direct the light beam to a photodetector;
the photodetector configured to convert the received light beam into an electrical signal, the photodetector being positioned at a focal plane of the receiver lens system; and
a phase-aberrating element arranged with respect to the receiver lens system and the photodetector such that the phase-aberrating element is configured to provide uniform angular irradiance at the focal plane of the receiver lens system.
2. The system of claim 1 , wherein the phase-aberrating element is a thin element with a non-uniform transverse phase profile.
3. The system of claim 1 , wherein the phase-aberrating element includes array elements that are configured to diffuse the light beam.
4. The system of claim 3 , wherein the array elements include quasi-random or random array of microelements.
5. The system of claim 3 , wherein each of the array elements is configured to refract or diffract a portion of the light beam less than a whole of the light beam.
6. The system of claim 3 , wherein the phase-aberrating element includes a pattern of the array elements that is formed into a substrate.
7. The system of claim 1 , wherein the phase-aberrating element is configured to receive the light beam from the receiver lens system and cause the light beam to have a diameter when the light beam reaches the focal plane of the receiver lens system, wherein the diameter is larger than a gap between pixels of the photodetector and smaller than the photodetector.
8. The system of claim 1 , wherein the phase-aberrating element is partially transparent to the received light beam.
9. The system of claim 1 , wherein the phase-aberrating element is arranged between the receiver lens system and the photodetector.
10. The system of claim 9 , wherein the phase-aberrating element is arranged closer to the receiver lens system than the photodetector.
11. The system of claim 9 , wherein the phase-aberrating element is arranged closer to the photodetector than the receiver lens system.
12. The system of claim 1 , wherein the phase-aberrating element is arranged such that in operation, a received light beam passes through the phase-aberrating element before passing through the receiver lens system.
13. The system of claim 1 , further comprising one or more processors in communication with the photodetector, the one or more processors being configured to:
determine a center point of the light beam received at the photodetector;
determine an average irradiance of the light beam received at the photodetector;
identify an average irradiance point of the light beam on the photodetector having the average irradiance; and
send instructions for performing an adjustment to the optical communication system according to a difference between the average irradiance point and the center point.
14. The system of claim 13 , further comprising a mirror, and wherein the adjustment is an adjustment of the mirror.
15. The system of claim 13 , further comprising a lens, and wherein the adjustment is an adjustment of the lens.
16. The system of claim 13 , wherein the instructions are configured to cause an adjustment to the received light beam such that the average irradiance point and the center point move towards one another.
17. The system of claim 13 , wherein the instructions are configured to cause an adjustment to the received light beam such that the average irradiance point and the center point overlap.
18. The system of claim 1 , further comprising one or more processors in communication with the photodetector, the one or more processors being configured to use the electrical signal to control an aspect of the optical communication system.
19. The system of claim 18 , further comprising a mirror, and wherein controlling an aspect of the optical communication system includes adjusting the mirror.
20. The system of claim 18 , further comprising a lens, and wherein controlling an aspect of the optical communication system includes adjusting the lens.