High Coherence at f and 2f of Mid-Infrared Supercontinuum Generation in Silicon Germanium Waveguides

Date

2020

Authors

Sinobad, M
Della Torre, Alberto
Armand, Remi
Luther-Davies, Barry
Ma, Pan
Madden, Steve
Mitchell, A.
Moss, David J
Hartmann, Jean-Michel
Fedeli, Jean-Marc

Journal Title

Journal ISSN

Volume Title

Publisher

Institute of Electrical and Electronics Engineers (IEEE Inc)

Abstract

Absorption spectroscopy based on supercontinuum generation in the mid-infrared is a powerful technique to analyze the chemical composition of samples. Furthermore, phase-coherent supercontinuum sources can enable fast data acquisition with coherent, stable pulses that allow single-shot measurements. We report here a numerical study of the coherence of an octavespanning mid-infrared supercontinuum source that was experimentally obtained in an air-clad SiGe/Si waveguide. We show that engineering two closely spaced zero-dispersion wavelengths that enclose an anomalous dispersion band centered around a fixed pump wavelength can produce supercontinuum pulses with high spectral density and full coherence at the extreme ends of the spectrum. This work is important for absorption spectroscopy, on-chip optical frequency metrology, and f-to-2f interferometry applications.

Description

Keywords

Optical waveguides, silicon germanium, silicon photonics, supercontinuum (SC) generation

Citation

Source

IEEE Journal on Selected Topics in Quantum Electronics

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1109/JSTQE.2019.2943358

Restricted until

2099-12-31