The project has exceeded all of its technical goals after two years, setting up the foundations of high-speed communications for NASA\u2019s future human missions to Mars.<\/p>\n
NASA\u2019s Deep Space Optical Communications technology successfully showed that data encoded in lasers could be reliably transmitted, received, and decoded after traveling millions of miles from Earth at distances comparable to Mars. Nearly two years after launching aboard the agency\u2019s Psyche mission in 2023, the technology demonstration recently completed its 65th and final pass, sending a laser signal to Psyche and receiving the return signal, from 218 million miles away.\u00a0<\/p>\n
\u201cNASA is setting America on the path to Mars, and advancing laser communications technologies brings us one step closer to streaming high-definition video and delivering valuable data from the Martian surface<\/a> faster than ever before,\u201d said acting NASA Administrator Sean Duffy. \u201cTechnology unlocks discovery, and we are committed to testing and proving the capabilities needed to enable the Golden Age of exploration.\u201d<\/p>\n<\/p>\n This video details how the Deep Space Optical Communications experiment broke records and how the technology demonstration could pave the way for future high-bandwidth data transmission out to Mars distances and beyond. NASA\/JPL-Caltech<\/p>\n Just a month after launch, the Deep Space Optical Communications demonstration proved<\/a> it could send a signal back to Earth it established a link with the optical terminal aboard the Psyche spacecraft.<\/p>\n \u201cNASA Technology tests hardware in the harsh environment of space to understand its limits and prove its capabilities,\u201d said Clayton Turner, associate administrator, Space Technology Mission Directorate at NASA Headquarters in Washington. \u201cOver two years, this technology surpassed our expectations, demonstrating data rates comparable to those of household broadband internet and sending engineering and test data to Earth from record-breaking distances.\u201d<\/p>\n On Dec. 11, 2023, the demonstration achieved a historic first<\/a> by streaming an ultra-high-definition video to Earth from over 19 million miles away (about 80 times the distance between Earth and the Moon), at the system\u2019s maximum bitrate of 267 megabits per second. The project also surpassed optical communications distance records on Dec. 3, 2024, when it downlinked Psyche data from 307 million miles away (farther than the average distance between Earth and Mars). In total, the experiment\u2019s ground terminals received 13.6 terabits of data from Psyche.<\/p>\n Managed by NASA\u2019s Jet Propulsion Laboratory (JPL) in Southern California, the experiment consists of a flight laser transceiver<\/a> mounted on the Psyche spacecraft, along with two ground stations to receive and send data from Earth. A powerful 3-kilowatt uplink laser at JPL\u2019s Table Mountain Facility transmitted a laser beacon to Psyche, helping the transceiver determine where to aim the optical communications laser back to Earth.<\/p>\n Both Psyche and Earth are moving through space at tremendous speeds, and they are so distant from each other that the laser signal \u2014 which travels at the speed of light \u2014 can take several minutes to reach its destination. By using the precise pointing required from the ground and flight laser transmitters to close the communication link, teams at NASA proved that optical communications can be done to support future missions throughout the solar system.<\/p>\n Another element of the experiment included detecting and decoding a faint signal after the laser traveled millions of miles. The project enlisted a 200-inch telescope at Caltech\u2019s Palomar Observatory<\/a> in San Diego County as its primary downlink station, which provided enough light-collecting area to collect the faintest photons. Those photons were then directed to a high-efficiency detector array<\/a> at the observatory, where the information encoded in the photons could be processed.\u00a0 \u00a0<\/p>\n \u201cWe faced many challenges, from weather events that shuttered our ground stations to wildfires in Southern California that impacted our team members,\u201d said Abi Biswas, Deep Space Optical Communications project technologist and supervisor at JPL. \u201cBut we persevered, and I am proud that our team embraced the weekly routine of optically transmitting and receiving data from Psyche. We constantly improved performance and added capabilities to get used to this novel kind of deep space communication, stretching the technology to its limits.\u201d<\/p>\n In another test, data was downlinked to an experimental radio frequency-optical \u201chybrid\u201d antenna<\/a> at the Deep Space Network\u2019s Goldstone complex near Barstow, California. The antenna was retrofitted with an array of seven mirrors, totaling 3 feet in diameter, enabling the antenna to receive radio frequency and optical signals from Psyche simultaneously.<\/p>\n The project also used Caltech\u2019s Palomar Observatory and a smaller 1-meter telescope at Table Mountain to receive the same signal from Psyche. Known as \u201carraying,\u201d this is commonly done with radio antennas to better receive weak signals and build redundancy into the system.<\/p>\n \u201cAs space exploration continues to evolve, so do our data transfer needs,\u201d said Kevin Coggins, deputy associate administrator, NASA\u2019s SCaN (Space Communications and Navigation) program at the agency\u2019s headquarters. \u201cFuture space missions will require astronauts to send high-resolution images and instrument data from the Moon and Mars back to Earth. Bolstering our capabilities of traditional radio frequency communications with the power and benefits of optical communications will allow NASA to meet these new requirements.\u201d<\/p>\n This demonstration is the latest in a series of optical communication experiments funded by the Space Technology Mission Directorate\u2019s Technology Demonstration Missions Program managed at NASA\u2019s Marshall Space Flight Center in Huntsville, Alabama, and the agency\u2019s SCaN program within the Space Operations Mission Directorate. The Psyche mission is led by Arizona State University. Lindy Elkins-Tanton of the University of California, Berkeley is the principal investigator. NASA JPL, managed by Caltech in Pasadena, California, is responsible for the mission\u2019s overall management.<\/p>\n To learn more about the laser communications demo, visit:<\/p>\n https:\/\/www.jpl.nasa.gov\/missions\/deep-space-optical-communications-dsoc\/<\/a><\/p>\n