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.
© 2010 Optical Society of America
Original Manuscript: November 18, 2009
Revised Manuscript: March 8, 2010
Manuscript Accepted: March 11, 2010
Published: March 26, 2010
Vol. 5, Iss. 8 Virtual Journal for Biomedical Optics
Arseny Vasilyev, Naresh Satyan, Shengbo Xu, George Rakuljic, and Amnon Yariv, "Multiple source frequency-modulated continuous-wave optical reflectometry: theory and experiment," Appl. Opt. 49, 1932-1937 (2010)