Open AccessGeneration of two-mode optical signals with broadband frequency tunability and low spurious signal level
Author(s) -
Ho-Jin Song,
Nobutaka Shimizu,
Tadao Nagatsuma
Publication year - 2007
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.15.014901
Subject(s) - optics , broadband , terahertz radiation , spurious relationship , signal (programming language) , materials science , octave (electronics) , optoelectronics , physics , computer science , machine learning , programming language
For continuous millimeter and terahertz-wave applications, a two-mode optical signal generation technique that uses two arrayed waveguide gratings and two optical switch units is presented. In addition to easy and fast operation, this scheme offers broadband frequency tunability and high signal purity with a low spurious mode level. Mode spacing, which corresponds to the frequency of the generated MM/THz-wave signal after photomixing, was successfully swept in the range of 200 ~ 550 GHz and the optical spurious mode suppression ratio higher than 25 dBc was achieved. In addition, spurious modes characteristics were investigated by using second harmonic generation (SHG) autocorrelation methods for several frequencies.