title: High-reflectivity-resolution coherent optical frequency domain reflectometry using optical frequency comb source and tunable delay line.
abstract: We propose a high-reflectivity-resolution coherent optical frequency domain reflectometry (OFDR) with a novel scheme of delay shift averaging (DSAV) by using an optical frequency comb source and a tunable delay line to suppress the fading noise. We show theoretically and experimentally that the novel DSAV scheme is equivalent, in realizing a high reflectivity resolution, to our previously reported frequency shift averaging (FSAV) of the same number of teeth of the optical frequency comb [1], but does not need the expensive narrow-pass-band tunable optical filter required in the previous scheme. Furthermore, by using this new method in combination with FSAV, better reflectivity-resolution is obtained compared to using only conventional FSAV with a single-wavelength laser source.
authors.affiliation: Department of Electrical Engineering and Information Systems, The University of Tokyo 7-3-1 Hongo, Tokyo 113-8656, Japan. zhe@ieee.org
authors.forename: Zuyuan
authors.initials: Z
authors.lastname: He
authors.forename: Takushi
authors.initials: T
authors.lastname: Kazama
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Koshikiya
authors.forename: Xinyu
authors.initials: X
authors.lastname: Fan
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Ito
authors.forename: Kazuo
authors.initials: K
authors.lastname: Hotate