Linearly chirped mid-infrared supercontinuum in all-normal-dispersion chalcogenide photonic crystal fibers

Xing, Sida; Kharitonov, Svyatoslav; Hu, Jianqi; Brès, Camille‐Sophie

doi:10.1364/oe.26.019627

Cited by 39 publications

(23 citation statements)

References 29 publications

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“…By contrast, achieving fully coherent octave-spanning SC with high spectral flatness is possible when pumping waveguides with sub-picosecond pulses in a low all-normal dispersion (ANDi) regime. Such SCs were reported in various fiber platforms, including silica [8][9][10], silicate soft glass [11,12], chalcogenide [13][14][15][16] fibers. However, SC generation in the ANDi regime on a chip has been only achieved in a chalcogenide waveguide [17] without any discussion about the phase coherence properties across the SC spectrum.…”

mentioning

confidence: 79%

Mid-infrared supercontinuum generation in silicon-germanium all-normal dispersion waveguides

Sinobad¹,

Torre²,

Armand³

et al. 2020

Opt. Lett.

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We demonstrate coherent supercontinuum generation spanning over an octave from a silicon germanium-on-silicon waveguide using ∼ 200 f s pulses at a wavelength of 4 µm. The waveguide is engineered to provide low all-normal dispersion in the TM polarization. We validate the coherence of the generated supercontinuum via simulations, with a high degree of coherence across the entire spectrum. Such a generated supercontinuum could lend itself to pulse compression down to 22 fs.

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mentioning

confidence: 79%

Mid-infrared supercontinuum generation in silicon-germanium all-normal dispersion waveguides

Sinobad¹,

Torre²,

Armand³

et al. 2020

Opt. Lett.

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“…In 2018, an octave-spanning SC, covering 1.124-2.4 μm, was generated in SOI ridge waveguides [38]. In order to avoid the inherent nonlinear loss encountered in silicon in the near infrared and achieve broader SC spectra, the research moved toward other platforms, such as silicon nitride [39], chalcogenide [40], silicon-germanium [41], indium gallium phosphide [42], and aluminum nitride [43]. In the context of SC generation, Guo et al [44] have reported a mid-infrared comb source from 2.5 μm to 4 μm in silicon nitride (Si 3 N 4 ) waveguides and, recently, a (400-2400)-nm supercontinuum source has been demonstrated in integrated lithium niobate waveguides [45].…”

Section: Introductionmentioning

confidence: 99%

Supercontinuum Generation Assisted by Wave Trapping in Dispersion-Managed Integrated Silicon Waveguides

et al. 2020

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Compact chip-scale comb sources are of significant interest for many practical applications. Here, we experimentally study the generation of supercontinuum (SC) in an axially varying integrated waveguide. We show that the local tuning of the dispersion enables the continuous blue shift of dispersive waves by more than 200 nm due to their trapping by the strongly compressed pump pulse. This mechanism provides an insight into supercontinuum generation in varying-dispersion integrated waveguides. Pumped close to 2.2 μm in the femtosecond regime and at a pulse energy of approximately 4 pJ, the output spectrum extends from 1.1 μm up to 2.76 μm and shows good coherence properties. Octave-spanning SC is also observed at an input energy as low as approximately 0.9 pJ. We show that the supercontinuum is more robust against variations of the input-pulse parameters and is also spectrally flatter in waveguides with an optimized dispersion profile than in dispersion-engineered ones. This research demonstrates the potential of varying-dispersion waveguides for coherent SC generation and paves the way for integrated low-power applications, such as chip-scale frequency-comb generation, precision spectroscopy, optical-frequency metrology, and wide-band wavelength division multiplexing in the near infrared.

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“…Thus, a wide choice of ND segments becomes possible for high-quality pulse compression in the alternating structures. Of fundamental interest is that this newly discovered phase effect explains more rigorously why, in general, ND SCG has a near parabolic spectral profile found in various experiments in the last decade [29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 92%

Enhanced Pulse Compression within Sign-Alternating Dispersion Waveguides

Zia

2021

Photonics

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We show theoretically and numerically how to optimize sign-alternating dispersion waveguides for maximum nonlinear pulse compression, while leveraging the substantial increase in bandwidth-to-input peak power advantage of these structures. We find that the spectral phase can converge to a parabolic profile independent of uncompensated higher-order dispersion. The combination of an easy to compress phase spectrum, with low input power requirements, then makes sign-alternating dispersion a scheme for high-quality nonlinear pulse compression that does not require high powered lasers, which is beneficial for instance in integrated photonic circuits. We also show a new nonlinear compression regime and soliton shaping dynamic only seen in sign-alternating dispersion waveguides. Through an example SiN-based integrated waveguide, we show that the dynamic enables the attainment of compression to two optical cycles at a pulse energy of 100 pJ which surpasses the compression achieved using similar parameters for a current state-of-the-art SiN system.

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Linearly chirped mid-infrared supercontinuum in all-normal-dispersion chalcogenide photonic crystal fibers

Cited by 39 publications

References 29 publications

Mid-infrared supercontinuum generation in silicon-germanium all-normal dispersion waveguides

Mid-infrared supercontinuum generation in silicon-germanium all-normal dispersion waveguides

Supercontinuum Generation Assisted by Wave Trapping in Dispersion-Managed Integrated Silicon Waveguides

Enhanced Pulse Compression within Sign-Alternating Dispersion Waveguides

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