29 May 2014
Low Power, Longer Distance, Tiny Package: New Laser Sensing Technology for Self-driving Cars, Smartphones and 3-D Video Games
Conceptual vision for an integrated 3-D camera with multiple pixels using the FMCW laser source. Credit: Behnam Behroozpour
3-D schematic showing MEMS-electronic-photonic heterogeneous integration. Credit: Niels Quack
WASHINGTON, May 29, 2014—A new twist on 3-D imaging technology could one day enable your self-driving car to spot a child in the street half a block away, let you answer your Smartphone from across the room with a wave of your hand, or play “virtual tennis” on your driveway.
The new system, developed by researchers at the University of California, Berkeley, can remotely sense objects across distances as long as 30 feet, 10 times farther than what could be done with comparable current low-power laser systems. With further development, the technology could be used to make smaller, cheaper 3-D imaging systems that offer exceptional range for potential use in self-driving cars, smartphones and interactive video games like Microsoft’s Kinect, all without the need for big, bulky boxes of electronics or optics.
“While meter-level operating distance is adequate for many traditional metrology instruments, the sweet spot for emerging consumer and robotics applications is around 10 meters” or just over 30 feet, says UC Berkeley’s Behnam Behroozpour, who will present the team’s work at CLEO: 2014, being held June 8-13 in San Jose, California, USA. “This range covers the size of typical living spaces while avoiding excessive power dissipation and possible eye safety concerns.”
The new system relies on LIDAR (“light radar”), a 3-D imaging technology that uses light to provide feedback about the world around it. LIDAR systems of this type emit laser light that hits an object, and then can tell how far away that object is by measuring changes in the light frequency that is reflected back. It can be used to help self-driving cars avoid obstacles halfway down the street, or to help video games tell when you are jumping, pumping your fists or swinging a “racket” at an imaginary tennis ball across an imaginary court.
In contrast, current lasers used in high-resolution LIDAR imaging can be large, power-hungry and expensive. Gaming systems require big, bulky boxes of equipment, and you have to stand within a few feet of the system for them to work properly, Behroozpour says. Bulkiness is also a problem for driverless cars such as Google’s, which must carry a large 3-D camera on its roof.
The researchers sought to shrink the size and power consumption of the LIDAR systems without compromising their performance in terms of distance.
In their new system, the team used a type of LIDAR called frequency-modulated continuous-wave (FMCW) LIDAR, which they felt would ensure their imager had good resolution with lower power consumption, Behroozpour says. This type of system emits “frequency-chirped” laser light (that is, whose frequency is either increasing or decreasing) on an object and then measures changes in the light frequency that is reflected back.
To avoid the drawbacks of size, power and cost, the Berkeley team exploited a class of lasers called MEMS tunable VCSELs. MEMS (micro-electrical-mechanical system) parts are tiny micro-scale machines that, in this case, can help to change the frequency of the laser light for the chirping, while VCSELs (vertical-cavity surface-emitting lasers) are a type of inexpensive integrable semiconductor lasers with low power consumption. By using the MEMS device at its resonance—the natural frequency at which the material vibrates—the researchers were able to amplify the system’s signal without a great expense of power.
“Generally, increasing the signal amplitude results in increased power dissipation,” Behroozpour says. “Our solution avoids this tradeoff, thereby retaining the low power advantage of VCSELs for this application.”
The team’s next plans include integrating the VCSEL, photonics and electronics into a chip-scale package. Consolidating these parts should open up possibilities for “a host of new applications that have not even been invented yet,” Behroozpour says—including the ability to use your hand, Kinect-like, to silence your ringtone from 30 feet away.
Presentation AW3H.2, titled “Method for Increasing the Operating Distance of MEMS LIDAR beyond Brownian Noise Limitation,” will take place Wednesday, June 11 at 4:45 p.m. in the Room 210H of the San Jose Convention Center.
PRESS REGISTRATION: A press room for credentialed press and analysts will be located in the San Jose Convention Center, Sunday through Thursday, June 8-12. Those interested in obtaining a press badge for CLEO: 2014 should contact Lyndsay Meyer at 202.416.1435 or firstname.lastname@example.org.
With a distinguished history as the industry's leading event on laser science, the Conference on Lasers and Electro-Optics (CLEO) is the premier international forum for scientific and technical optics, uniting the fields of lasers and opto-electronics by bringing together all aspects of laser technology, from basic research to industry applications. CLEO: Expo showcases the latest products and applications from more than 300 participating companies from around the world, providing hands-on demonstrations of the latest market innovations and applications. The Expo also offers valuable on-floor programming, including Market Focus and the Technology Transfer program.
Sponsored by the American Physical Society's (APS) Laser Science Division, IEEE Photonics Society and The Optical Society (OSA), CLEO provides the full range of critical developments in the field, showcasing the most significant milestones from laboratory to marketplace. With an unparalleled breadth and depth of coverage, CLEO connects all of the critical vertical markets in lasers and electro-optics. For more information, visit www.cleoconference.org. CLEO: 2014 takes place June 8 - 13 at the San Jose Convention Center.