Panoramic laser communication optical systems for low Earth orbit satellite networking

Area of Science:

• Optics
• Aerospace Engineering
• Telecommunications

Background:

• Satellite constellations require high-capacity laser communication.
• Limited field of view (FOV) in current terminals hinders inter-satellite links.
• Developing wide-FOV optical systems is crucial for scalable satellite networks.

Purpose of the Study:

• To present a novel wide-field optical system for satellite laser communication.
• To address the challenge of limited FOV in existing satellite communication terminals.
• To leverage freeform optics for enhanced inter-satellite link establishment.

Main Methods:

• Utilized vector reflection laws and ray tracing to link FOV with outgoing light rays.
• Employed an aperture extension method to enlarge transmit and receive apertures.
• Designed an optical head with a freeform surface contour based on data points and XY polynomial coefficients.

Main Results:

• Achieved a wide FOV range of ±30° to ±70° after optimization.
• Enabled laser communication over 1200 km with suitable divergence angles.
• Freeform surfaces reduced beam spread by ~50% and extended range by ~450 km compared to non-spherical designs.

Conclusions:

• Freeform optics significantly improve distortion and modulation transfer function (MTF) in satellite communication systems.
• The developed wide-field optical system enhances scalability and performance for satellite networks.
• This research provides a theoretical basis for advanced freeform optics in future satellite communications.