Open AccessSilicon-rich nitride waveguides for ultra-broadband nonlinear signal processing
Author(s) -
Mohammad Rezagholipour Dizaji,
Clemens J. Krückel,
Attila Fülöp,
Peter A. Andrekson,
Víctor Torres-Company,
Lawrence R. Chen
Publication year - 2017
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.25.012100
Subject(s) - materials science , optics , photonics , silicon nitride , waveguide , optoelectronics , silicon photonics , dispersion (optics) , self phase modulation , cross phase modulation , nonlinear optics , silicon , physics , phase modulation , laser , phase noise
Silicon nitride (SixNy) waveguides constitute a technology platform to realize optical signal processing based on the nonlinear Kerr effect. Varying the stoichiometry of the core (i.e., x and y in silicon nitride) provides an additional degree of freedom for engineering the waveguide properties, such as nonlinear Kerr parameter and dispersion. We demonstrate low-stress high-confinement silicon-rich nitride waveguides with flat and anomalous dispersion over the entire C and L optical wavelength transmission bands for optical signal processing based on cross-phase modulation. The waveguides do not show any nonlinear loss for a measured optical input intensity of up to 1.5 × 10 9 W/cm 2 . In particular, we achieve wavelength conversion of 10 Gb/s signals across the C band; XPM broadening is also observed in the O band. In addition, we highlight the use of SixNy waveguides for nonlinear microwave photonics. Specifically, we demonstrate radio-frequency spectral monitoring of optical signals with a bandwidth of hundreds of gigahertz.