title: Correction for phase-shift deviation in a complex Fourier-transform integrated-optic spatial heterodyne spectrometer with an active phase-shift scheme.
abstract: We report that a spectrum can be retrieved with a planar waveguide spatial heterodyne spectrometer (SHS) incorporating an active phase-shift scheme, where the phase shifts are distributed around π/2. This was confirmed experimentally with an SHS that had 32 interleaved Mach-Zehnder interferometers and whose free spectral range was 625 GHz. The phase shifts ranged from 0.71 to 2.2 rad against the target of π/2 rad.
authors.affiliation: Department of Electronic Engineering, Faculty of Engineering, Gunma University, 1-5-1 Tenjin, Kiryu, Gunma 376-8515, Japan. takada@el.gunma‐u.ac.jp
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Takada
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Aoyagi
authors.forename: Katsunari
authors.initials: K
authors.lastname: Okamoto
mesh_terms: D002138:Calibration; D005583:Fourier Analysis; D055620:Optical Phenomena; D012815:Signal Processing, Computer-Assisted; D013057:Spectrum Analysis / Q000379:methods*; D018511:Systems Integration