US 11,874,404 B2
Multi-chirp pre-distorted laser linearization for FMCW LiDAR
Lawrence D. Tzuang, New York, NY (US); Daniel E. Bush, New York, NY (US); and Christopher T. Phare, New York, NY (US)
Assigned to Voyant Photonics, Inc.
Filed by Voyant Photonics, Inc., New York, NY (US)
Filed on Jul. 14, 2021, as Appl. No. 17/375,597.
Prior Publication US 2023/0014034 A1, Jan. 19, 2023
Int. Cl. G01C 3/08 (2006.01); G01S 7/4915 (2020.01); G01S 17/34 (2020.01)
CPC G01S 7/4915 (2013.01) [G01S 17/34 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A system for LiDAR (light detection and ranging) chirp signal linearization comprising:
a first splitter for splitting a chirped laser signal from a laser into two optical signals;
an optical delay element for imparting a known delay on one of the two optical signals generating a delayed optical signal, the other of the two optical signals an undelayed optical signal; and
an optical 90° hybrid for
receiving said undelayed and delayed optical signals, and
generating a first IF optical signal output and a second IF optical signal output from said undelayed and delayed optical signals,
wherein said generating imparts a 90° relative IF phase shift between the first and second IF optical signal outputs, the first and second IF optical signal outputs corresponding to I/Q channels of an IF optical signal of a combination of the undelayed and delayed optical signals.