Ultrabroadband supercontinuum generation in a CMOS-compatible platform

Halir, Robert; Okawachi, Yoshitomo; Levy, Jacob S.; Foster, Mark A.; Lipson, Michal; Gaeta, Alexander L.

doi:10.1364/ol.37.001685

Cited by 204 publications

(125 citation statements)

References 23 publications

(26 reference statements)

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“…Hydex and SiN offer the advantage of much lower linear and nonlinear losses as well as transparency well into the visible. It is interesting to compare the broadband frequency combs with SCG in Hydex waveguides [92] where a spectral width > 350 nm was achieved (limited by experimental measurement capability), as well as with SCG in 1100-nm wide SiN nanowires [93]. When pumping at 1335 nm in this platform SCG resulted in a spectrum spanning 1.6 octaves, from 665 nm to 2025 nm.…”

Section: Supercontinuum Generationmentioning

confidence: 99%

“…Remarkably, both of these results were enabled by a high effective nonlinearity, negligible TPA and most significantly, by very flexible dispersion engineering. SCG is significantly enhanced if the pulse is launched near a zero groupvelocity dispersion (GVD) point or in the anomalous GVD regime [93][94][95][96]. The former minimizes temporal pulse broadening, thereby preserving high peak powers and thus maintaining a strong nonlinear interaction.…”

Section: Supercontinuum Generationmentioning

confidence: 99%

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New CMOS-compatible platforms based on silicon nitride and Hydex for nonlinear optics

et al. 2013

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Section: Supercontinuum Generationmentioning

confidence: 99%

Section: Supercontinuum Generationmentioning

confidence: 99%

New CMOS-compatible platforms based on silicon nitride and Hydex for nonlinear optics

et al. 2013

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“…A large shock time enables the observation of soliton self-frequency shift in silicabased fibers with short lengths (O(10) cm) and intense pump powers (O(1) kW) [39], while in SiN-based waveguides (not resonators), the Raman effect is not observed [40,41]. However, in microresonators, due to the cavity building (finesse F = D1 κ ≈ O(100 − 1000)), the lightmaterial interaction length is effectively increased (to O(1) m) and meanwhile the pulse peak power is dramatically promoted (e.g.…”

Section: (E)mentioning

confidence: 99%

Raman Self-Frequency Shift of Dissipative Kerr Solitons in an Optical Microresonator

et al. 2016

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The formation of temporal dissipative solitons in continuous wave laser driven microresonators enables the generation of coherent, broadband and spectrally smooth optical frequency combs as well as femtosecond pulses with compact form factor. Here we report for the first time on the observation of a Raman-induced soliton self-frequency shift for a microresonator soliton. The Raman effect manifests itself in amorphous SiN microresonator based single soliton states by a spectrum that is hyperbolic secant in shape, but whose center is spectrally red-shifted (i.e. offset) from the continuous wave pump laser. The shift is theoretically described by the first order shock term of the material's Raman response, and we infer a Raman shock time of 20 fs for amorphous SiN. Moreover, we observe that the Raman induced frequency shift can lead to a cancellation or overcompensation of the soliton recoil caused by the formation of a (coherent) dispersive wave. The observations are in excellent agreement with numerical simulations based on the Lugiato-Lefever equation (LLE) with a Raman shock term. Our results contribute to the understanding of Kerr frequency combs in the soliton regime, enable to substantially improve the accuracy of modeling and are relevant to the fundamental timing jitter of microresonator solitons.Introduction. -Microresonator based optical frequency combs (Kerr combs) [1, 2] enable optical frequency comb generation from a continuous wave (CW) laser, with repetition rates in the microwave domain (>10 GHz), and broad spectral bandwidth [3][4][5]. Recently, a qualitatively new operation regime has been discovered [6], in which the parametrically generated comb seeds the formation of a temporal dissipative (cavity) soliton [7][8][9]. Such temporal dissipative solitons, first externally induced in fiber cavities [10], have been observed in Kerr frequency comb experiments using crystalline microresonators [6,11] and have recently also been generated in photonic chip based silicon nitride (SiN) integrated resonators [5,12]. Soliton based microresonator frequency combs have several attractive features, in particular being fully coherent, having smooth envelopes and giving access to femtosecond pulses. Indeed, the short duration of temporal solitons in crystalline microresonators have been used for external fiber broadening [6,13] and have allowed to achieve self-referencing (i.e. determination of the comb's carrier envelope frequency) enabling to count the cycles of light [13]. Moreover, taking advantage of dispersion engineering [3,14], the presence of third (and higher) order dispersion allows (coherent) dispersive waves (DWs) to be generated [12] via the effect of soliton induced Cherenkov radiation [15]. This process has been used to create a photonic chip based (coherent) frequency comb in a SiN microresonator spanning 2/3 of an octave at electronically detectable mode spacing. However, while advances in theoretical simulations of the soliton regime have occured [14,16,17] a key underlying question is what ot...

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“…In a variety of waveguides, including silicon nitride waveguides [24] and chalcogenide waveguides [25] supercontinuum generation has been demonstrated. It can be shown that the widest supercontinuum spectra are generated when nonlinear waveguides are pumped at a wavelength were they have a small anomalous dispersion (for positive n 2 ) [20].…”

Section: Ultrashort Pulses In the Telecommunication Bandmentioning

confidence: 99%

“…A multitude of linear and nonlinear functions in silicon nitride [14] have been demonstrated. However, most of these, such as supercontinuum generation [24] and comb generation [29,31], have focused on the telecom wavelength band. In addition to this work, a broadband source covering red to near-infrared wavelengths is interesting for biophotonics applications.…”

Section: Sin Waveguide Structures For Nonlinear Optics In the Visiblementioning

confidence: 99%

Nonlinear optical interactions in silicon waveguides

et al. 2017

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Abstract:The strong nonlinear response of silicon photonic nanowire waveguides allows for the integration of nonlinear optical functions on a chip. However, the detrimental nonlinear optical absorption in silicon at telecom wavelengths limits the efficiency of many such experiments. In this review, several approaches are proposed and demonstrated to overcome this fundamental issue. By using the proposed methods, we demonstrate amongst others supercontinuum generation, frequency comb generation, a parametric optical amplifier, and a parametric optical oscillator.

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Ultrabroadband supercontinuum generation in a CMOS-compatible platform

Cited by 204 publications

References 23 publications

New CMOS-compatible platforms based on silicon nitride and Hydex for nonlinear optics

New CMOS-compatible platforms based on silicon nitride and Hydex for nonlinear optics

Raman Self-Frequency Shift of Dissipative Kerr Solitons in an Optical Microresonator

Nonlinear optical interactions in silicon waveguides

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