Multiple source frequency-modulated continuous-wave optical reflectometry: theory and experiment.
We propose and demonstrate a novel approach to increase the effective bandwidth of a frequency-modulated continuous-wave (FMCW) ranging system. This is achieved by algorithmically stitching together the swept spectra of separate laser sources. The result is an improvement in the range resolution proportional to the increase in the swept-frequency range. An analysis of this system as well as the outline of the stitching algorithm are presented. Using three distinct swept-frequency optical waveforms, we experimentally demonstrate a threefold improvement in the range resolution of a three-sweep approach over the conventional FMCW method.
Vasilyev
Arseny
A
Department of Applied Physics, California Institute of Technology, 1200 East California Boulevard 128-95, Pasadena, California 91125, USA. vasilyev@caltech.edu
Satyan
Naresh
N
Xu
Shengbo
S
Rakuljic
George
G
Yariv
Amnon
A
D000465:Algorithms; D005583:Fourier Analysis; D007834:Lasers; D008962:Models, Theoretical; D055096:Optical Devices; D055620:Optical Phenomena; D041623:Tomography, Optical Coherence / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data