Satellite Laser Communications Primer

Key Takeaways

• Optical links move more data by using narrow infrared beams instead of radio.
• Deployed systems now support science, broadband, defense, and relay missions.
• Weather, pointing, standards, safety, and policy still shape adoption.

Satellite Laser Communications Moves From Demonstration to Infrastructure

On April 28, 2026, the National Aeronautics and Space Administration reported that Artemis II’s optical terminal exchanged 484 gigabytes of data between Orion and Earth during the crewed lunar flyby, using laser links for high-definition video, images, procedures, engineering data, science data, and voice communications. That event placed satellite laser communications in a different category from earlier laboratory tests and short demonstrations. The technology had supported a crewed mission at lunar distance, carried public-facing imagery, and proved that optical links could operate as part of a human spaceflight communications architecture.

Satellite laser communications, also called optical communications, use tightly focused beams of light to move data between spacecraft, between spacecraft and aircraft, or between spacecraft and ground terminals. Most space missions still rely on radio frequency systems because radio links are mature, well understood, and resilient in weather conditions that block optical signals. Laser links add a different capability. They can carry larger data volumes through narrower beams, reducing the size of antennas, limiting signal spread, and enabling high-capacity cross-links among satellites.

The technology matters because satellites now collect more data than many missions can easily return to Earth. Earth observation satellites produce larger images, radar products, climate measurements, and hyperspectral datasets. Broadband constellations need high-capacity routing paths that do not depend on every satellite seeing a ground gateway at all times. Defense and security architectures need low-latency paths from sensors to users. Lunar and deep-space missions increasingly expect video, instrument files, software updates, and operational data streams that exceed the capacity of legacy links.

Laser communications do not replace every radio system. Spacecraft still need radio for command, tracking, telemetry, emergencies, and weather-resilient operations. The better model is layered communications. Radio provides dependable coverage and compatibility. Optical links provide high-capacity data movement when geometry, weather, terminal pointing, and network operations support the link. This division of labor explains why civil agencies, commercial broadband operators, and defense organizations now treat optical communications as a practical network layer rather than a novelty.

Optical Links and Radio Links Serve Different Jobs

Radio and optical systems both transmit electromagnetic energy, but they operate at very different wavelengths. Radio links use longer wavelengths that spread more broadly and can pass through clouds, haze, and precipitation better than optical beams. Optical links use near-infrared light with much shorter wavelengths, which allows a narrower beam and higher data density. The tighter beam means a spacecraft can send more data through a smaller aperture, but it also means the spacecraft must point with high precision.

The Deep Space Optical Communications technology demonstration on NASA’s Psyche mission shows the benefit and the constraint in the same example. NASA reported in 2024 that the demonstration achieved up to 267 megabits per second (Mbps) at 19 million miles and 25 Mbps at 140 million miles, with lower rates at longer distances because the beam spreads and signal strength falls with distance. Deep-space optical links can greatly increase data return, yet they still need large receiving telescopes, clean atmospheric paths, accurate pointing, and supporting radio communications.

For low Earth orbit (LEO) missions, the value proposition is different. A satellite may pass over a ground terminal for only a few minutes. Higher downlink capacity means one pass can return far more data. NASA’s TeraByte InfraRed Delivery (TBIRD) payload demonstrated this point when it transmitted 4.8 terabytes of error-free data in five minutes at 200 gigabits per second (Gbps) during a 2023 pass, according to NASA’s TBIRD mission summary. A high-data-rate optical downlink can change mission operations by reducing how long data waits onboard before reaching users.

Optical inter-satellite links create another use case. Instead of sending every packet to the ground at the first opportunity, satellites can move data through space until one satellite has a better path to a gateway, relay, aircraft, ship, or user terminal. SpaceX says each Starlink technology satellite carries space lasers, also called optical inter-satellite links, that operate at up to 200 Gbps. Amazon’s Project Kuiper demonstrated 100 Gbps optical links between prototype satellites over about 1,000 kilometers. These systems treat laser links as routing infrastructure, not just as a fast pipe from orbit to Earth.

The comparison below shows why radio and optical links usually coexist rather than compete as simple substitutes.

How the Technology Works From Terminal to Network

A satellite laser communications terminal usually contains a laser transmitter, optical receiver, telescope or aperture, fine steering mirror, control electronics, modem, and pointing system. The transmitter modulates light to carry digital information. The receiver detects faint incoming light and turns it back into data. For a downlink, the spacecraft points its optical terminal toward a ground telescope. For an optical inter-satellite link (OISL), two spacecraft find and track each other as they move through orbit.

Pointing, acquisition, and tracking form the core technical challenge. The transmitting terminal must know where the receiving terminal will be, account for spacecraft motion, compensate for vibration and thermal drift, and maintain alignment through the pass. Acquisition can use beacon signals, predicted ephemeris data, and scanning patterns. Tracking then keeps the beam locked on the receiver. Even a small pointing error can reduce the received signal because the beam is narrow by design.

Atmospheric conditions dominate space-to-ground optical communications. Clouds can block the link completely. Smoke, turbulence, and water vapor can reduce signal quality. Ground networks answer this problem through site diversity, meaning multiple optical ground terminals in different weather zones. A mission can route data to a clear site rather than depend on one terminal. NASA’s Laser Communications Relay Demonstration used optical ground stations in California and Hawaii as part of its relay architecture, giving engineers a way to study real atmospheric effects and operational planning.

Space-to-space optical links avoid weather, but they introduce network problems. Constellation operators must coordinate link schedules, handovers, routing, and terminal compatibility. A broadband constellation may have thousands of moving nodes. Each satellite may need to connect to neighbors ahead, behind, or in adjacent orbital planes. A defense transport architecture may require vendor interoperability so a satellite built by one supplier can link with terminals built by another. The Space Development Agency has addressed this through Optical Communication Terminal standards intended to support interoperability in the Proliferated Warfighter Space Architecture.

Network design also determines the business value. A single optical downlink can speed data return for one mission. A relay network can serve many spacecraft. A constellation mesh can move traffic between continents, oceans, aircraft, and remote areas without immediately touching terrestrial infrastructure. A lunar relay system could connect landers, habitats, rovers, and orbiters. A deep-space system could return more science from Mars, asteroid missions, and outer planet probes, although those missions still require large ground receivers and radio support.

Deployed Systems Proving the Architecture

The first large operational reference point is Europe’s data-relay architecture. The European Data Relay System, developed through the European Space Agency (ESA) and Airbus partnership, relays data from LEO satellites through geostationary spacecraft to Europe. Its use with Copernicus Sentinel missions demonstrated that optical relays could reduce the delay between image collection and data delivery. That model matters for emergency response, maritime monitoring, environmental services, and security-related Earth observation because a satellite does not need to wait for a direct pass over a local ground station.

NASA’s LCRD gave the United States a long-duration optical relay testbed. It is a two-way, end-to-end optical relay in geosynchronous orbit that supports experiments between space and ground. The Integrated LCRD Low Earth Orbit User Modem and Amplifier Terminal, known as ILLUMA-T, extended the relay chain to the International Space Station and showed how a LEO user terminal could send data through LCRD to Earth. NASA’s later Artemis II system then demonstrated optical communications at lunar distance on a crewed mission.

TBIRD proved that small spacecraft can deliver very large data volumes if the optical payload, ground terminal, and operations plan fit the mission. The 200 Gbps downlink was especially relevant for small satellites because it showed that compact spacecraft can use optical communications for high-throughput return without relying on large radio antennas. This has direct relevance for Earth observation companies, scientific CubeSats, hyperspectral missions, and hosted payloads that generate more data than earlier small-satellite downlinks could handle.

Commercial broadband systems have moved optical links into production-scale constellation design. SpaceX’s Starlink, Amazon’s Project Kuiper, and Telesat Lightspeed all position optical inter-satellite links as part of their network architectures. Telesat Lightspeed describes optical inter-satellite links as a way to create a mesh network in space with many potential routing paths. The operational purpose is straightforward: keep data moving even when a satellite is not above the right gateway, improve resilience, and reduce dependence on terrestrial landing points.

Programs Under Development and Planned Networks

The next phase of satellite laser communications centers on scale, interoperability, and multi-orbit networking. ESA’s HydRON program is designed as a high-throughput digital and optical network that can connect orbital layers using optical technology. ESA signed a 2025 contract with Thales Alenia Space for Element #2 of the HydRON demonstration system, and Kepler Communications has been selected for HydRON work related to the LEO segment and interoperability testing. The program points toward a network model that treats optical communications as space-based data transport.

The Space Development Agency’s transport layer is another major driver. Its OCT standards define top-level specifications for optical communications terminals intended to support interoperability across vendors in the Proliferated Warfighter Space Architecture. The agency’s model depends on many satellites moving data with low latency. That requirement puts pressure on terminal suppliers, satellite manufacturers, and network software providers to meet standards that work at constellation scale.

NASA’s exploration plans also keep optical communications active. Artemis II used the Orion Artemis II Optical Communications System (O2O), and NASA’s O2O program page described a planned rate of up to 260 Mbps for science data, flight plans, procedures, images, and communications. The broader exploration requirement is larger than one crewed flight. Lunar orbiters, landers, spacesuits, rovers, surface instruments, and relay assets can generate data that benefits from high-capacity links, especially when high-definition video and instrument products are part of mission operations.

Deep-space optical communications remain under development because the distances are unforgiving. DSOC on Psyche showed that optical links can work at interplanetary distances, but operational systems will need ground networks, scheduling methods, fault procedures, and integration with radio networks. Future Mars missions may gain from optical links because science instruments can generate data faster than current downlinks return it. The system will still need radio support because weather, line-of-sight geometry, and terminal availability can interrupt optical service.

Commercial operators are likely to use optical links for more than broadband. Earth observation companies can return data faster. On-orbit servicing spacecraft can send inspection imagery to operators. Orbital manufacturing platforms can transmit process monitoring data. Space stations can support video, payload operations, and private research customers. Defense and security users can move sensor data through space-based routing paths with less dependence on ground infrastructure in contested or remote regions.

Engineering Barriers That Still Limit Adoption

Clouds remain the most familiar weakness for space-to-ground optical links. Radio waves can pass through many weather conditions that block infrared light. Optical networks answer this through ground site diversity, forecasting, relay satellites, store-and-forward operations, and hybrid radio backup. These measures reduce downtime but add cost and complexity. A mission that needs continuous real-time data cannot treat a single optical ground station as a full replacement for radio infrastructure.

Pointing requirements impose another constraint. A high-capacity optical terminal must keep a narrow beam aligned over long distances. LEO satellites move quickly relative to ground sites and other satellites. Lunar and deep-space links add long light-time and weaker received signals. Mechanical jitter, thermal changes, spacecraft attitude control, and terminal calibration all affect performance. Better terminals reduce these issues through fine steering, stable structures, accurate ephemeris data, and control algorithms.

Interoperability is a growing problem because many operators are building optical systems at the same time. If every constellation uses proprietary terminals, waveforms, acquisition procedures, and network protocols, cross-network services will remain limited. Standards help create a market in which satellites from different manufacturers can exchange data through compatible terminals. The Consultative Committee for Space Data Systems has published optical communications standards, and the SDA has issued defense-oriented terminal standards. Market adoption will depend on how much commercial operators accept shared specifications versus closed architectures.

Supply chains also need time to mature. Optical terminals require precision optics, detectors, lasers, mechanisms, control electronics, thermal design, and specialized testing. Production volume must increase if every broadband satellite, Earth observation spacecraft, relay node, and defense satellite carries multiple terminals. Reliability must also improve because replacing a failed terminal in orbit is usually impossible. Terminal vendors must deliver hardware that survives launch loads, radiation, thermal cycling, contamination, and years of pointing operations.

Cybersecurity and mission assurance cannot be ignored. Narrow optical beams reduce casual interception risk because the beam does not spread like a broad radio signal, but that does not make the network automatically secure. Encryption, authentication, key management, access control, routing security, and ground system protection still matter. Optical links can move more data, and that makes the consequences of compromised access larger. High-capacity networks need security architectures designed for the whole data path, from spacecraft payload to end user.

Commercial Opportunity in Space Data Movement

The first commercial opportunity is faster delivery of Earth observation data. Imaging satellites already serve agriculture, insurance, maritime monitoring, disaster response, energy infrastructure, finance, and defense and security markets. Higher resolution sensors and synthetic aperture radar produce large files. Optical downlinks can reduce the time between collection and delivery, particularly when paired with relay networks or geographically diverse ground terminals. Faster delivery can support subscription products that sell freshness rather than archive access.

Broadband constellations create a second opportunity. Optical inter-satellite links let traffic move through orbital routing paths before landing at a gateway or user-linked node. This can reduce dependence on dense gateway networks and improve coverage over oceans, polar regions, and remote land areas. It can also support private network services for enterprise, government, aviation, maritime, and defense users that want data paths separated from ordinary public internet routing for part of the journey.

Relay services form a third market. A relay provider can serve spacecraft that do not carry large ground communications infrastructure of their own. Smaller missions may prefer buying data transport rather than building a global ground station network. This business model depends on pricing, scheduling reliability, terminal compatibility, customer trust, and service-level agreements. A successful relay market would make optical capacity available to universities, small companies, national space agencies, and hosted payload customers.

Hardware supply is another opportunity. Optical terminals, detectors, lasers, pointing assemblies, test equipment, and network software all form parts of the value chain. Commercial suppliers that can provide flight-qualified terminals at scale may serve broadband constellations, defense programs, civil agencies, and lunar infrastructure. The acquisition of Mynaric by Rocket Lab, disclosed through a 2026 SEC filing, shows how space companies are moving optical terminal capabilities into broader satellite manufacturing portfolios.

Ground infrastructure has its own market. Optical ground stations need telescopes, adaptive optics in some cases, weather analytics, network operations, fiber backhaul, physical security, and regulatory permissions. Locations matter because clear skies, atmospheric stability, power, fiber access, security, and geopolitical reliability shape service quality. Site diversity can create demand for ground stations in dry regions, island locations, high-altitude facilities, polar support areas, and government-controlled facilities.

Data services may become the highest-margin layer. Optical links help move larger datasets faster, but customers usually pay for decisions, alerts, analysis, images, compliance records, or secure connectivity. A wildfire detection operator, a shipping company, a national mapping agency, or a lunar mission planner may value the application more than the communications method. Optical communications become commercially powerful when they reduce delay, expand data volume, or make a service dependable enough to support paying users.

Policy and Standards Issues Shaping Adoption

Satellite laser communications sit partly outside the traditional radio spectrum problem, but they do not sit outside policy. Optical links use light rather than licensed radio spectrum, reducing pressure on crowded frequency bands. That benefit does not remove public responsibilities. Operators still need safe laser practices, coordination with aircraft and observatories, ground terminal permissions, cybersecurity measures, export controls, procurement rules, and international coordination for cross-border services.

Laser safety standards are central because free-space optical communications involve open beams. The International Electrotechnical Commission standard IEC 60825-12 addresses safety for free-space optical communication systems used for information transmission. Operators must account for wavelength, power, beam divergence, pointing, exposure limits, aircraft safety, worker safety, and ground terminal access. Eye-safe design is especially relevant for systems near airports, populated areas, test ranges, ships, aircraft, and crewed spaceflight.

Astronomy raises another policy issue. Optical links may affect astronomical observations if bright beams, beacon lasers, or terminal operations cross telescope fields of view. Coordination can reduce risk through scheduling, beam control, location selection, power management, and communication with observatories. The issue differs from reflected sunlight from satellites, but both relate to the expanding presence of active space infrastructure in optical astronomy.

Interoperability policy is increasingly tied to procurement. Government buyers can require terminal standards, interface testing, and cross-vendor compatibility. Defense buyers have strong reasons to avoid single-vendor lock-in because operational networks may require many suppliers, allied participants, and fast technology refresh cycles. Civil agencies face similar concerns when relay networks must support spacecraft built by different organizations. Standards do not guarantee an open market, but they reduce barriers for new entrants and give customers more sourcing options.

Export controls and security classification can slow adoption. Optical terminals used in high-capacity defense networks may involve controlled technology, sensitive performance parameters, and restricted interoperability data. Commercial operators want international customers. Governments want to protect sensitive capabilities. The policy challenge is to permit healthy commercial markets without exposing systems that support protected communications or national security missions.

Data governance also matters. Optical links can move large datasets quickly between jurisdictions. A constellation may collect data in one region, route it through space, land it in another country, process it in a cloud region, and sell it to users elsewhere. Privacy law, national security review, remote sensing licensing, sanctions compliance, and data localization rules can all affect service design. Communications capacity alone does not decide where data may legally go.

Satellite Laser Communications and the Shape of Future Space Networks

Satellite laser communications will likely expand through hybrid networks rather than one-for-one replacement of radio systems. Spacecraft will continue to carry radio links because command authority, tracking, emergency modes, and weather-tolerant communications require dependable channels. Optical systems will carry the traffic that benefits most from capacity: high-resolution Earth observation data, science files, broadband backhaul, relay services, crew video, lunar surface data, and defense transport traffic.

The architecture will become more layered. LEO satellites will connect to nearby satellites through OISLs. Some traffic will move to medium Earth orbit or geostationary relay nodes. Ground networks will use many optical sites, often linked to terrestrial fiber. Radio gateways will continue to support coverage and resiliency. Network software will decide where traffic goes based on weather, link quality, priority, latency requirements, cost, and security policy.

Civil science missions could gain a larger return on spacecraft instruments. A telescope, radar instrument, hyperspectral camera, or planetary probe is less useful when it creates data that cannot be returned in full or in time. Optical communications can reduce that bottleneck. The value does not come only from faster transmission. It comes from changing instrument design, operations tempo, user expectations, and archive depth.

Commercial operators may also rethink where value sits. A company with optical links can sell faster tasking, lower latency, persistent connectivity, secure routing, or premium delivery windows. Broadband providers can reduce ground dependency. Earth observation firms can support near-real-time products. Relay providers can create shared infrastructure for missions that otherwise would need bespoke ground systems. The market will reward the companies that convert optical capacity into dependable services rather than headline data rates alone.

Government procurement will shape the pace of adoption. NASA, ESA, the Space Development Agency, and other public buyers can validate technology, fund demonstrations, require standards, and create anchor demand. Commercial markets can then reduce cost through volume. The pattern already appears in broadband constellations and defense transport architectures. The next test is whether optical terminal supply, open interfaces, ground networks, and service contracts can support many customers without custom engineering for each mission.

Summary

Satellite laser communications entered a more practical phase because multiple systems have moved beyond isolated experiments. NASA demonstrated high-rate small-satellite downlinks through TBIRD, relay operations through LCRD and ILLUMA-T, deep-space links through DSOC, and crewed lunar-distance optical communications through Artemis II. Europe’s EDRS showed operational relay value, and HydRON points toward multi-orbit optical transport. Commercial broadband operators now treat optical inter-satellite links as part of constellation design.

The strongest case for optical communications is capacity. Space missions collect more data, users expect faster delivery, and networks need routing options that avoid constant dependence on ground gateways. Optical links answer those needs through narrow infrared beams, smaller terminals, higher data rates, and space-based mesh routing. The strongest case against full replacement is resilience. Clouds, pointing, terminal cost, operational complexity, and security obligations keep radio systems in the architecture.

The opportunity is larger than satellite hardware. Optical communications affects ground stations, relay services, data platforms, onboard processing, defense and security networks, standards, insurance, export control, and end-user products. Its commercial value will depend on reliability, compatibility, pricing, and integration with the services customers already buy. The winners will not be the operators with the most dramatic single-pass demonstration. They will be the ones that make high-capacity space data movement routine.

Appendix: Useful Books Available on Amazon

• Free-Space Laser Communications
• Free Space Optical Communication
• Optical Wireless Communications: System and Channel Modelling with MATLAB
• Optical Wireless Communications: An Emerging Technology
• Satellite Communications Systems Engineering
• Satellite Communications
• Free Space Optical Communication

Appendix: Top Questions Answered in This Article

What Is Satellite Laser Communications?

Satellite laser communications is the use of tightly focused light beams to transmit data between satellites, between satellites and aircraft, or between satellites and ground terminals. It is also called optical communications because it uses optical wavelengths rather than radio frequencies. The main benefit is higher data capacity through a narrower beam.

Why Do Satellites Use Lasers Instead of Radio?

Satellites use lasers when a mission needs to move large volumes of data quickly. Optical links can support high-definition video, large science files, broadband routing, and rapid Earth observation delivery. Radio remains valuable because it handles weather better and supports mature command, tracking, and telemetry operations.

Do Laser Links Replace Satellite Radio Systems?

Laser links usually complement radio systems rather than replace them. Radio systems remain necessary for dependable command, emergency operations, tracking, and weather-resilient communications. Optical systems carry high-capacity traffic when conditions and geometry support the link.

What Is an Optical Inter-Satellite Link?

An optical inter-satellite link is a laser communications path between two spacecraft. It allows satellites to pass data directly to one another rather than sending every packet immediately to a ground gateway. Broadband constellations and defense transport layers use this approach to create mesh routing in orbit.

Why Do Clouds Matter for Optical Communications?

Clouds can block or degrade infrared laser beams traveling between spacecraft and ground terminals. Operators reduce this risk by using multiple ground sites in different weather regions, routing through relay satellites, storing data until conditions improve, and maintaining radio backup links.

What Did NASA Demonstrate With TBIRD?

NASA’s TBIRD payload demonstrated very high-rate laser downlink from a small spacecraft. Its most visible achievement was a 200 Gbps downlink that returned 4.8 terabytes of error-free data in five minutes. The result showed that compact satellites can return large datasets quickly through optical links.

Why Was Artemis II Important for Optical Communications?

Artemis II showed that optical communications could support a crewed mission at lunar distance. The Orion optical terminal transmitted high-definition video, photos, science data, engineering data, procedures, and voice communications. That made the mission a practical demonstration for future human exploration communications.

What Is the Main Business Opportunity?

The main business opportunity is faster, higher-capacity data movement from space to users. Earth observation companies, broadband constellations, relay providers, lunar infrastructure developers, and defense networks can all benefit. The highest-value services will connect optical capacity to timely products, secure routing, and dependable delivery.

What Policy Issues Affect Satellite Laser Communications?

Policy issues include laser safety, aircraft coordination, astronomy protection, interoperability, export control, cybersecurity, and data governance. Optical links reduce pressure on radio spectrum but introduce open-beam safety and cross-network coordination questions. Standards and procurement rules will shape how open the market becomes.

What Makes Optical Communications Hard to Scale?

Scaling optical communications requires reliable terminals, accurate pointing, affordable production, interoperable standards, and ground networks with enough clear-sky availability. Large constellations also need software that manages routing, handovers, weather outages, security, and traffic priority without custom handling for every link.

Appendix: Glossary of Key Terms

Satellite Laser Communications

Satellite laser communications uses light beams to transmit data between spacecraft, ground terminals, aircraft, or relay nodes. The term usually refers to near-infrared optical links designed for high-capacity data movement. It differs from ordinary radio communications because the beam is much narrower and more sensitive to pointing.

Optical Communications

Optical communications is the transfer of information using light rather than radio waves. In space systems, it commonly means laser-based links between satellites or between satellites and ground terminals. The approach can support high data rates, but atmospheric conditions affect space-to-ground performance.

Radio Frequency

Radio frequency refers to electromagnetic signals in frequency bands traditionally used for wireless communications, radar, navigation, and satellite links. Spacecraft use radio frequency systems for command, telemetry, tracking, science data return, and user communications. Radio links remain valuable because they handle weather better than optical beams.

Downlink

A downlink is the communications path from a spacecraft to Earth. In optical systems, the downlink usually sends data through an infrared laser beam toward a ground telescope or optical terminal. Downlink performance depends on pointing accuracy, atmospheric conditions, receiver sensitivity, and available contact time.

Low Earth Orbit

Low Earth orbit is the region of space close to Earth where many imaging, communications, scientific, and defense satellites operate. Satellites in this orbit move quickly relative to the ground, creating short contact windows. High-capacity optical downlinks can return large datasets during those brief passes.

Optical Inter-Satellite Link

An optical inter-satellite link is a laser connection between spacecraft. These links let satellites route data through other satellites before reaching a ground gateway or user path. They are especially useful in broadband constellations, relay networks, and defense architectures that need low-latency routing.

Laser Communications Relay

A laser communications relay receives optical data from one user and forwards it through another link, often to a ground station. Relays reduce dependence on direct spacecraft-to-ground visibility. They can support Earth observation, human spaceflight, lunar operations, and missions that need rapid data delivery.

Pointing, Acquisition, and Tracking

Pointing, acquisition, and tracking describes the process of finding a communications partner, locking onto it, and keeping the beam aligned. Optical links need this process because narrow laser beams can lose signal with small pointing errors. Terminals use beacons, predictions, sensors, and fine steering.

Free-Space Optical Communications

Free-space optical communications means sending light through open air or space rather than through fiber optic cable. Satellite optical communications are a form of free-space optical communications. The open path creates advantages in data density and disadvantages related to weather, safety, and line-of-sight geometry.

Optical Ground Station

An optical ground station is a terrestrial facility that receives or transmits laser communications signals. It may include telescopes, detectors, tracking systems, network equipment, weather monitoring, and fiber backhaul. Site choice matters because clouds, turbulence, local security, and connectivity affect service reliability.