| 1. |
- Alshaykh, Mohammed S., et al.
(author)
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Optical dual-comb Vernier division of an octave-spanning Kerr microcomb
- 2021
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In: 2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings.
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Conference paper (peer-reviewed)abstract
- We measure the repetition rate of a 900 GHz octave-spanning soliton microcomb based on Vernier dual-comb frequency division implemented with two silicon nitride microresonator combs fabricated on the same wafer.
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| 2. |
- Bao, Chengying, et al.
(author)
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Observation of Breathing Dark Pulses in Normal Dispersion Optical Microresonators
- 2018
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In: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 121:25
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Journal article (peer-reviewed)abstract
- Breathers are localized waves in nonlinear systems that undergo a periodic variation in time or space. The concept of breathers is useful for describing many nonlinear physical systems including granular lattices, Bose-Einstein condensates, hydrodynamics, plasmas, and optics. In optics, breathers can exist in either the anomalous or the normal dispersion regimes, but they have only been characterized in the former, to our knowledge. Here, externally pumped optical microresonators are used to characterize the breathing dynamics of localized waves in the normal dispersion regime. High-Q optical microresonators featuring normal dispersion can yield mode-locked Kerr combs whose time-domain waveform corresponds to circulating dark pulses in the cavity. We show that with relatively high pump power these Kerr combs can enter a breathing regime, in which the time-domain waveform remains a dark pulse but experiences a periodic modulation on a time scale much slower than the microresonator round trip time. The breathing is observed in the optical frequency domain as a significant difference in the phase and amplitude of the modulation experienced by different spectral lines. In the highly pumped regime, a transition to a chaotic breathing state where the waveform remains dark-pulse-like is also observed, for the first time to our knowledge; such a transition is reversible by reducing the pump power.
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| 3. |
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| 4. |
- Fülöp, Attila, 1988, et al.
(author)
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Frequency noise of a normal dispersion microresonator-based frequency comb
- 2017
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In: Optics InfoBase Conference Papers. - 2162-2701. - 9781943580231 ; , s. W2A.6-
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Conference paper (peer-reviewed)abstract
- Using delayed self-heterodyne coherent detection, we characterized the FM noise across the C-band of a widely spaced microresonator-based frequency comb. The resulting linewidth depends on both the pump laser and the comb line position.
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| 5. |
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| 6. |
- Metcalf, A.J., et al.
(author)
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Fully programmable two-dimensional pulse shaper for broadband line-by-line amplitude and phase control
- 2013
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In: Optics Express. - 1094-4087 .- 1094-4087. ; 21:23, s. 28029-28039
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Journal article (peer-reviewed)abstract
- We introduce a fully programmable two-dimensional (2D) pulse shaper, able to simultaneously control the amplitude and phase of very fine spectral components over a broad bandwidth. This is achieved by aligning two types of spectral dispersers in a cross dispersion setup: a virtually imaged phased array for accessing fine resolution and a transmission grating for achieving broad bandwidth. We take advantage of the resultant 2D dispersion profile as well as introduce programmability by adding a 2D liquid crystal on silicon spatial light modulator at the masking plane. Our shaper has a resolution of ~3 GHz operating over the entire 'C' band of >5.8 THz. Experimental evidence is provided that highlights the full programmability, fine spectral control, and broad bandwidth operation (limited currently by the bandwidth of the input light). We also show lineby- line manipulation of record 836 comb lines over the C-band. © 2013 Optical Society of America.
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| 7. |
- Metcalf, A. J., et al.
(author)
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High-Power Broadly Tunable Electrooptic Frequency Comb Generator
- 2013
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In: IEEE Journal of Selected Topics in Quantum Electronics. - : Institute of Electrical and Electronics Engineers (IEEE). - 1558-4542 .- 1077-260X. ; 19:6
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Journal article (peer-reviewed)abstract
- Broadband traveling-wave electrooptic modulators made of lithium niobate have reached a high level of technological maturity. They can provide simultaneously low V pi, sustain high power (both optical and RF) and yet provide low propagation loss. By combining together these features, we present a high-power handling, broadly tunable, electrooptic frequency comb generator. The device produces between 60 and 75 lines within -10 dB bandwidth over its full tuning range-from 6 to 18 GHz- and can handle up to 1 W of optical input power. This optical frequency comb platform is very well suited for applications in RF photonics and optical communications that require independent RF and optical tuning as well as high-repetition rates but moderate bandwidth.
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| 8. |
- Nazemosadat Arsanjani, Seyedeh Bentolhoda, 1984, et al.
(author)
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Switching dynamics of dark-pulse Kerr frequency comb states in optical microresonators
- 2021
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In: Physical Review A. - 2469-9934 .- 2469-9926. ; 103:1
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Journal article (peer-reviewed)abstract
- Dissipative Kerr solitons are localized structures that exist in nonlinear optical cavities. They lead to the formation of microcombs - chip-scale frequency combs that could facilitate precision frequency synthesis and metrology by capitalizing on advances in silicon photonics. Previous demonstrations have mainly focused on anomalous dispersion cavities. Notwithstanding, localized structures also exist in the normal dispersion regime in the form of circulating dark pulses, but their physical dynamics is far from being understood. Here, we explore dark-pulse Kerr combs generated in normal dispersion optical microresonators and report the discovery of reversible switching between coherent dark-pulse combs, whereby distinct states can be accessed deterministically. Furthermore, we reveal that the formation of dark-pulse Kerr combs is associated with the appearance of another resonance, a feature that has never been observed for dark pulses and is ascribed to soliton behavior. These results contribute to understanding the nonlinear physics in normal dispersion nonlinear cavities and provide insight into the generation of microcombs with high conversion efficiency.
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| 9. |
- O'Malley, Nathan P., et al.
(author)
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RF Stabilization of Vernier Dual-microcombs
- 2023
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In: 2023 Conference on Lasers and Electro-Optics, CLEO 2023.
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Conference paper (peer-reviewed)abstract
- Leveraging the Vernier dual-comb method, we self-reference a THz octave-spanning microcomb with fCEO ~100 GHz - normally too high for typical detection equipment - and translate the stability of an RF reference to optical frequencies.
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| 10. |
- O'Malley, Nathan P., et al.
(author)
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Vernier Frequency Combs for Stabilization of RF/Optical Links
- 2022
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In: Optics InfoBase Conference Papers. - 9781957171050
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Conference paper (peer-reviewed)abstract
- We utilize the Vernier effect to partially stabilize a pair of high repetition rate, octave-spanning Kerr solitons in silicon nitride microrings fabricated on the same wafer.
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| 11. |
- O'Malley, Nathan P., et al.
(author)
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Vernier Microcombs for Future Miniature Yb + Clocks
- 2023
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In: 2023 IEEE Photonics Conference, IPC 2023 - Proceedings.
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Conference paper (peer-reviewed)abstract
- We demonstrate an architecture for dualmicrocomb-based readout of an optical clock. Microcombs frequency-divide a compact narrow-linewidth laser, capable of being frequency-doubled to within a few GHz of a 171Yb+ clock transition, to an RF output.
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| 12. |
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| 13. |
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| 14. |
- Wu, Rui, et al.
(author)
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Supercontinuum-based 10-GHz flat-topped optical frequency comb generation
- 2013
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In: Optics Express. - 1094-4087 .- 1094-4087. ; 21:5, s. 6045-6052
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Journal article (peer-reviewed)abstract
- The generation of high-repetition-rate optical frequency combs with an ultra-broad, coherent and smooth spectrum is important for many applications in optical communications, radio-frequency photonics and optical arbitrary waveform generation. Usually, nonlinear broadening techniques of comb-based sources do not provide the required flatness over the whole available bandwidth. Here we present a 10-GHz ultra-broadband flat-topped optical frequency comb (> 3.64-THz or 28 nm bandwidth with ∼365 spectral lines within 3.5-dB power variation) covering the entire Cband. The key enabling point is the development of a pre-shaping-free directly generated Gaussian comb-based 10-GHz pulse train to seed a highly nonlinear fiber with normal dispersion profile. The combination of the temporal characteristics of the seed pulses with the nonlinear device allows the pulses to enter into the optical wave-breaking regime, thus achieving a smooth flat-topped comb spectral envelope. To further illustrate the high spectral coherence of the comb, we demonstrate high-quality pedestal-free short pulse compression to the transform-limited duration. © 2013 Optical Society of America\e.
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