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| 2. |
- Castello-Lurbe, David, et al.
(författare)
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Inverse dispersion engineering in silicon waveguides
- 2014
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Ingår i: Journal of the Optical Society of America B: Optical Physics. - 1520-8540 .- 0740-3224. ; 31:8, s. 1829-1835
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Tidskriftsartikel (refereegranskat)abstract
- We present a numerical tool that searches an optimal cross section geometry of silicon-on-insulator waveguides given a target dispersion profile. The approach is a gradient-based multidimensional method whose efficiency resides on the simultaneous calculation of the propagation constant derivatives with respect to all geometrical parameters of the structure by using the waveguide mode distribution. The algorithm is compatible with regular mode solvers. As an illustrative example, using a silicon slot hybrid waveguide with 4 independent degrees of freedom, our approach finds ultra-flattened (either normal or anomalous) dispersion over 350 nm bandwidth in less than 10 iterations.
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| 3. |
- Castello-Lurbe, David, et al.
(författare)
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Supercontinuum generation in silicon waveguides based on optical wave-breaking
- 2014
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Ingår i: Nonlinear Photonics. - Washington, D.C. : OSA.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- We theoretically find the third order dispersion that optimizes the spectral broadening induced by optical wave-breaking. It produces supercontinuum spectra spanning beyond 2=3 of an octave in a silicon waveguide pumping at 1550 nm.
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| 4. |
- Fülöp, Attila, 1988, et al.
(författare)
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Phase-sensitive resonant four-wave mixing in silicon nitride microresonators
- 2015
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Ingår i: European Conference on Lasers and Electro-Optics, CLEO 2015; Munich; Germany; 21 June 2015 through 25 June 2015. - 9781467374750 - 9781467374750 ; , s. CD_P_9-
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Konferensbidrag (refereegranskat)abstract
- We have investigated the phase sensitive nature of resonant four-wave mixing in silicon nitride microresonators. The generated idlers show a clear periodic behavior as a function of the input signal’s phase matching our simulations.
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| 5. |
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| 6. |
- Fülöp, Attila, 1988, et al.
(författare)
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Resonant nonlinear effects in silicon nitride microresonators
- 2014
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Ingår i: Optics & Photonics in Sweden, 11-12 Nov. 2014, Göteborg.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Silicon nitride is a fully CMOS-compatible material that in recent years has been gaining significant attention for realizing nonlinear optics at the chip scale. Its properties include low linear losses and absence of two-photon absorption. In terms of applications, parametric mixing and WDM-compatible light generation are both possible and thus make it an ideal material for microresonators.In this work we have investigated the linear and nonlinear properties of dual-layer silicon nitride resonators through both simulations and experiments. The devices are manufactured by LioniX and have the added advantage of being single-mode.The linear properties are shown in Fig. 1, the mode profile and the dispersion of the dual-layer waveguides have been simulated using COMSOL. In this poster, we will present our most recent experimental investigations that illustrate the coherent phase-sensitive nature of the resonant four-wave mixing in these devices.
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| 7. |
- Fülöp, Attila, 1988, et al.
(författare)
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Triply resonant coherent four-wave mixing in silicon nitride microresonators
- 2015
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Ingår i: Optics Letters. - 0146-9592 .- 1539-4794. ; 40:17, s. 4006-4009
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Tidskriftsartikel (refereegranskat)abstract
- The generation of multiple tones using four-wave mixing (FWM) has been exploited for many applications, ranging from wavelength conversion to frequency comb generation. FWM is a coherent process, meaning that its dynamics strongly depends on the relative phase among the waves involved. The coherent nature of FWM has been exploited for phase-sensitive processing in different waveguide structures, but it has never been studied in integrated microresonators. Waveguides arranged in a resonant way allow for an effective increase in the wavelength conversion efficiency (at the expense of a reduction in the operational bandwidth). In this letter, we show that phase shaping of a three-wave pump provides an extra degree of freedom for controlling the FWM dynamics in microresonators. We present experimental results in single-mode, normal-dispersion high-Q silicon nitride resonators, and numerical calculations of systems operating in the anomalous dispersion regime. Our results indicate that the wavelength conversion efficiency and modulation instability gain in microcavities pumped by multiple waves can be significantly modified with the aid of simple lossless coherent control techniques.
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| 8. |
- Torres Company, Victor, 1981, et al.
(författare)
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Comparative analysis of spectral coherence in microresonator frequency combs
- 2014
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Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 22:4, s. 4678-4691
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Tidskriftsartikel (refereegranskat)abstract
- Microresonator combs exploit parametric oscillation and nonlinear mixing in an ultrahigh-Q cavity. This new comb generator offers unique potential for chip integration and access to high repetition rates. However, time-domain studies reveal an intricate spectral coherence behavior in this type of platform. In particular, coherent, partially coherent or incoherent combs have been observed using the same microresonator under different pumping conditions. In this work, we provide a numerical analysis of the coherence dynamics that supports the above experimental findings and verify particular design rules to achieve spectrally coherent microresonator combs. A particular emphasis is placed in understanding the differences between so-called Type I and Type II combs.
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| 9. |
- Torres Company, Victor, 1981, et al.
(författare)
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Spectral coherence in microresonator combs
- 2014
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Ingår i: Optics InfoBase Conference Papers. - 2162-2701. ; , s. paper SM1M.3-
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Konferensbidrag (refereegranskat)abstract
- We provide a quantitative analysis of the coherence in microresonator frequency combs. We show how to achieve coherent transform-limited pulses on-chip without actively manipulating the pump setting conditions in the course of comb formation.
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