Open AccessDesign of a compact and ultrahigh-resolution Fourier-transform spectrometer
Author(s) -
B. Imran Akca
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.001487
Subject(s) - optics , astronomical interferometer , spectrometer , interferometry , fourier transform , bandwidth (computing) , fourier transform spectroscopy , resolution (logic) , photodetector , power dividers and directional couplers , interference (communication) , physics , materials science , fourier transform infrared spectroscopy , telecommunications , computer science , quantum mechanics , artificial intelligence , channel (broadcasting)
In this work, a compact and ultrahigh-resolution Fourier-transform spectrometer design is presented which is in great demand in numerous areas. The spectrometer is formed by sequentially-activated 60 Mach-Zehnder interferometers that are connected to photodetectors through very-low-loss beam combiners based on two-mode interference. The long optical delays are provided by tapping the propagating light out at certain locations on the optical waveguides by using electro-optically-controlled directional couplers. A design example with a spectral resolution of 500 MHz (~1 pm) and bandwidth of 15 GHz is presented for a device size of only 2 cm × 0.5 cm (1 cm 2 ).