Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 35, Issue 14, Pages 2994-3002Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2017.2703644
Keywords
Frequency comb generation; Ge waveguide; mid-infrared region; supercontinuum generation
Funding
- National Natural Science Foundation of China [61307109, 61475023]
- Beijing Youth Top-notch Talent Support Program [2015000026833ZK08]
- Natural Science Foundation of Beijing [4152037]
- Fund of State Key Laboratory of Information Photonics and Optical Communications (BUPT) China [IPOC2016ZT05]
- Research Grant Council of the Hong Kong Special Administrative Region China [PolyU152471/16E]
- Shenzhen Science and Technology Innovation Commission [JCYJ20160331141313917]
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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.
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