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Title: Mid-infrared octave-spanning supercontinuum and frequency comb generation in a suspended germanium-membrane ridge waveguide
Authors: Yuan, JH
Kang, Z 
Li, F 
Zhang, XT 
Sang, XZ
Wu, Q
Yan, BB
Wang, KR
Zhou, X 
Zhong, KP 
Zhou, GY
Yu, CX 
Lu, C
Tam, HY 
Wai, PKA 
Keywords: Frequency comb generation
Ge waveguide
Mid-infrared region
Supercontinuum generation
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers
Source: Journal of lightwave technology, 2017, v. 35, no. 14, p. 2994-3002 How to cite?
Journal: Journal of lightwave technology 
Abstract: Stable octave-spanning supercontinuum (SC) in the mid-infrared (MIR) region finds extensive applications in spectroscopy, metrology, biochemistry, etc. The absorption of conventional silicon-or silicon oxide-dominated nonlinear media makes SC generation in MIR region technically challenging. In this paper, we propose ultrabroadband MIR-SC generation using a suspended germanium-membrane ridge waveguide. We theoretically showed that when pump pulses centered at 4.8 mu m with pulse width at 180 fs and peak power at 800 W are injected into a 4-mm-long proposed ridge waveguide, the SC generated ranges from 1.96-12 mu m (about 2.6 octaves), extending deep into the "fingerprint" region. The first-order coherence is calculated to confirm the stability of the generated SC. The performance of the SC-based frequency comb is also investigated by assuming a 100-pulses pump source at a repetition rate of 100 kHz.
ISSN: 0733-8724
EISSN: 1558-2213
DOI: 10.1109/JLT.2017.2703644
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