title: Algorithmic Enhancement of Spectral Resolution of a LiNbO3 Waveguide-Based Miniature Fourier Transform Spectrometer.
abstract: In a recent report we demonstrated a miniature static Fourier transform spectrometer (FTS) that was implemented with a LiNbO3(LN) waveguide electro-optic modulator (EOM) combined with the dispersion relation between its half-wave voltage and wavelength. The FTS was verified to be able to measure laser wavelength and for low-resolution spectroscopy. In this report, we successfully applied the resolution enhancement algorithm to the FTS, resulting in at least a three-fold increase in its spectral resolution without causing obvious distortion of the measured spectra. The algorithm method used is based on an autoregressive (AR) model, singular value decomposition (SVD), and forward-backward linear prediction (FBLP). The combination of these methods allows the FTS to remain a small size but to possess good spectral resolution, effectively mitigating the conflict between the small size and high resolution of the device. This study opens the way to development of high-resolution miniature FTS.
authors.affiliation: State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing, China.
authors.forename: Jinyang
authors.initials: J
authors.lastname: Li
authors.affiliation: State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing, China.
authors.forename: Dan-Feng
authors.initials: DF
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing, China zhimei-qi@mail.ie.ac.cn.
authors.forename: Zhi-Mei
authors.initials: ZM
authors.lastname: Qi
keywords: Algorithmic enhancement; Autoregressive (AR) model; Forward–backward linear prediction; Singular value decomposition; Static Fourier transform spectrometer