# US 2021/0242940 A1 · Method of Optical Aperture Integration for Producing Symmetric Irradiance Pattern > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242940 A1 - Document ID: US20210242940A1 - Status: Published application - Kind: A1 - Application number: 17/236,410 - Filed: 2021-04-21 - Published: 2021-08-05 - Earliest claimed: 2019-11-27 - Assignees: X Development LLC - Applicants: X Development LLC - Inventors: Nam-hyong Kim; Baris Erkmen; Andrei Kazmierski; Devin Brinkley; John Moody; Markus Demartini; Wei-cheng Lai; Halleh Balch - Web page: https://patentgrep.com/patent/US20210242940A1 ## CPC - H04B 10/1121: {One-way transmission} - H04B 10/1125: {using a single common optical path} - H04B 10/67: Optical arrangements in the receiver - H04B: TRANSMISSION ## Abstract 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The system of claim 1, wherein the phase-aberrating element is a thin element with a non-uniform transverse phase profile. ### Claim 3 (depends on 1) The system of claim 1, wherein the phase-aberrating element includes array elements that are configured to diffuse the light beam. ### Claim 4 (depends on 3) The system of claim 3, wherein the array elements include quasi-random or random array of microelements. ### Claim 5 (depends on 3) 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. ### Claim 6 (depends on 3) The system of claim 3, wherein the phase-aberrating element includes a pattern of the array elements that is formed into a substrate. ### Claim 7 (depends on 1) 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. ### Claim 8 (depends on 1) The system of claim 1, wherein the phase-aberrating element is partially transparent to the received light beam. ### Claim 9 (depends on 1) The system of claim 1, wherein the phase-aberrating element is arranged between the receiver lens system and the photodetector. ### Claim 10 (depends on 9) The system of claim 9, wherein the phase-aberrating element is arranged closer to the receiver lens system than the photodetector. ### Claim 11 (depends on 9) The system of claim 9, wherein the phase-aberrating element is arranged closer to the photodetector than the receiver lens system. ### Claim 12 (depends on 1) 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. ### Claim 13 (depends on 1) 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. ### Claim 14 (depends on 13) The system of claim 13, further comprising a mirror, and wherein the adjustment is an adjustment of the mirror. ### Claim 15 (depends on 13) The system of claim 13, further comprising a lens, and wherein the adjustment is an adjustment of the lens. ### Claim 16 (depends on 13) 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. ### Claim 17 (depends on 13) 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. ### Claim 18 (depends on 1) 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. ### Claim 19 (depends on 18) The system of claim 18, further comprising a mirror, and wherein controlling an aspect of the optical communication system includes adjusting the mirror. ### Claim 20 (depends on 18) The system of claim 18, further comprising a lens, and wherein controlling an aspect of the optical communication system includes adjusting the lens.