US 11,947,048 B2
Crosstalk reduction for light detection and ranging (lidar) devices using wavelength locking
David Schleuning, Piedmont, CA (US); Pierre-Yves Droz, Los Altos, CA (US); Jason Watson, San Jose, CA (US); and James Dunphy, San Jose, CA (US)
Assigned to Waymo LLC, Mountain View, CA (US)
Filed by Waymo LLC, Mountain View, CA (US)
Filed on Oct. 1, 2020, as Appl. No. 17/061,003.
Claims priority of provisional application 63/020,615, filed on May 6, 2020.
Prior Publication US 2021/0349185 A1, Nov. 11, 2021
Int. Cl. G01S 7/487 (2006.01); G01S 7/481 (2006.01); G01S 7/4863 (2020.01); G01S 17/931 (2020.01)
CPC G01S 7/487 (2013.01) [G01S 7/4818 (2013.01); G01S 7/4863 (2013.01); G01S 17/931 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A light detection and ranging (lidar) device comprising:
a first light emitter configured to emit a first light signal;
a second light emitter configured to emit a second light signal;
a transparent substrate;
a first light guide disposed on the transparent substrate, wherein the first light guide is optically coupled to the first light emitter and configured to guide the first light signal from a first input end to a first output end, wherein the first output end comprises a first angled portion configured to direct the first light signal through the transparent substrate and toward an environment surrounding the lidar device;
a second light guide disposed on the transparent substrate, wherein the second light guide is optically coupled to the second light emitter and configured to guide the second light signal from a second input end to a second output end, wherein the second output end comprises a second angled portion configured to direct the second light signal through the transparent substrate and toward the environment surrounding the lidar device;
a first light detector positioned to receive the first light signal upon the first light signal being reflected by a first object in the environment surrounding the lidar device;
a second light detector positioned to receive the second light signal upon the second light signal being reflected by a second object in the environment surrounding the lidar device;
a first wavelength-locking mechanism configured to use a portion of the first light signal to maintain a wavelength of the first light signal; and
a second wavelength-locking mechanism configured to use a portion of the second light signal to maintain a wavelength of the second light signal, wherein the wavelength of the first light signal and the wavelength of the second light signal are different from one another.