Free space optical terminal with dither based alignment
US11606140B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 2021 |
| Grant date | Mar 14, 2023 |
| Priority date | — |
| Expiry date | Jul 22, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/676
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Embodiments relate to a bidirectional free space optical (FSO) communications system. Specifically, data-encoded FSO beams are transmitted and received between two terminals. A transmit (Tx) direction of a beam transmitted from the first terminal is dithered by a beam steering unit (BSU). As the dithered beam is received by the second terminal, the power levels of the beam are measured. The power levels are then encoded in a data-encoded FSO beam transmitted to the first terminal. This allows the first terminal to decode the received FSO beam and determine the power levels. The power levels allow the first terminal to determine Tx direction misalignments and adjust the Tx direction for the Tx beam sent to the second terminal. This process may be repeated to reduce Tx misalignments and may be performed by both terminals such that each terminal sends power level information to the opposite terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.