Open AccessAll-polarization-maintaining Er-doped dual comb fiber laser using single-wall carbon nanotubes
Author(s) -
S. Saito,
Masahito Yamanaka,
Y. Sakakibara,
Emiko Omoda,
Hiromichi Kataura,
Norihiko Nishizawa
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.017868
Subject(s) - materials science , comb filter , optics , carbon nanotube , fiber laser , laser , frequency comb , saturable absorption , polarization (electrochemistry) , optical fiber , comb generator , doping , optoelectronics , filter (signal processing) , nanotechnology , physics , chemistry , computer science , computer vision
We demonstrated a bi-directional, Er-doped dual comb fiber laser consisting of all-polarization-maintaining fiber devices. Polyimide films in which single-wall carbon nanotubes (SWNTs) were dispersed were used as the in-line saturable absorber. In order to avoid synchronization of the two combs and associated damage to the SWNT film, a two-branch configuration with two SWNT films was employed. Soliton pulses with almost the same optical spectra were generated stably in each direction, and dual comb beats were observed simply by overlapping the two outputs. The repetition frequency was 28 MHz, and the frequency difference was 105-140 Hz. Thanks to the small frequency difference, dual comb beats corresponding to the whole optical spectrum were observed without any overlapping. Fourier transform spectroscopy using the developed dual comb source was examined, and the characteristics of an optical filter were successfully obtained.