Open AccessMid-IR supercontinuum generated in low-dispersion Ge-on-Si waveguides pumped by sub-ps pulses
Author(s) -
Minghui Yang,
Yuhao Guo,
Jing Wang,
Zhonghua Han,
Kazumi Wada,
Lionel C. Kimerling,
Anuradha M. Agarwal,
Jürgen Michel,
Guifang Li,
Lin Zhang
Publication year - 2017
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.25.016116
Subject(s) - supercontinuum , materials science , optics , broadband , optoelectronics , dispersion (optics) , waveguide , nonlinear optics , self phase modulation , laser , photonic crystal fiber , wavelength , physics
Ge-on-Si is an attractive material platform for mid-IR broadband sources on a chip because of its wide transparency window, high Kerr nonlinearity and CMOS compatibility. We present a low-loss Ge-on-Si waveguide with flat and low dispersion from 3 to 11 µm, which enables a coherent supercontinuum from 2 to 12 µm, generated using a sub-ps pulsed pump. We show that 700-fs pump pulses with a low peak power of 400 W are needed to generate such a wide supercontinuum, and the waveguide length is around 5.35 mm.