Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Photonics I
Q 4.3: Vortrag
Montag, 29. Februar 2016, 11:30–11:45, f342
Investigation of higher-order mode content in Si3N4 integrated optical waveguides via spatially and spectrally resolved imaging — •Niklas M. Lüpken1, Tim Hellwig1, Martin Schnack1, Klaus-J. Boller2, and Carsten Fallnich1,2 — 1Institute of Applied Physics, University of Münster — 2MESA+ Institute for Nanotechnology, University of Twente
High-confinement Si3N4 integrated optical waveguides have been shown to be highly suitable for ultra-broadband supercontinuum generation1. Thick waveguides (800 nm×1000 nm), which are inherently multi-mode, have been identified to feature suitable dispersion for efficient supercontinuum generation. We present a detailed experimental investigation of the excitation of transverse modes in these integrated optical waveguides by characterizing the modal distribution at the output of the waveguide. In our experiment a lensed fiber is scanned transversally over the input facet of the waveguide, giving a position-dependent higher-order mode excitation. The modal content was measured by spatially and spectrally resolved imaging (S2 imaging)2, being an interferometrically based method and, therefore, sensitive enough to detect even very weak higher-order modes.
The presented measurement system can be used for modal decomposition and optimization of fundamental mode content in integrated optical waveguides. Furthermore, our results show that the higher-order mode content is negligible in the studied waveguides.
1 Epping JP, et al., Opt. Express 23, 19596 (2015).
2 Nicholson JW, et al., Opt. Express 16, 7233 (2008).