Chipscale optical frequency combs: from soliton physics to coherent communication
(Conference Presentation)

Brasch, Victor; Geiselmann, Michael; Herr, Tobias; Lihachev, Grigory; Pfeiffer, Martin H. P.; Gorodetsky, M. L.; Kippenberg, Tobias J.

doi:10.1117/12.2231293

Cited by 7 publications

(20 citation statements)

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“…-We next investigate how the Raman effect influences cavity soliton with the presence of higher-order dispersion effects. For this we use two other sets of SiN microresonators with two different structural geometries that allow shorter soliton pulses and enable coherent DW generation, as recently demonstrated in [12]. Third order dispersion D3 2π = O(10) kHz is characterized in the waveguide, on the fundamental TM 00 mode.…”

Section: (E)mentioning

confidence: 99%

“…Experimentally pumped at 1550 nm a single soliton comb is generated in both samples, and more importantly, a coherent DW is identified at around 195 THz (cf. [12] for more experimental details). Since a coherent DW is spectrally situated in the normal dispersion regime, the overall comb bandwidth is significantly extended to ∼ 75 THz.…”

Section: (E)mentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

“…-The study is based on SiN microresonators [32] in which recently temporal solitons were generated [12]. The first set of samples was fabricated by a newly developed "photonic damascene pro- cess" [33].…”

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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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confidence: 99%

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confidence: 99%

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

et al. 2016

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Phase-coherent microwave-to-optical link with a self-referenced microcomb

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Latest advances in optical frequency combs based on quadratic non‐linearity

Barturen

Benjamin

Alejandro

2020

IET Optoelectronics

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Second‐order non‐linear susceptibility (χ2) is the cause of many non‐linear processes in optics including second harmonic generation, sum frequency generation and difference frequency generation. Optical frequency combs based on χ2, i.e. quadratic frequency combs, hold the promise of reducing the devices power consumption and footprint since χ2 materials present a stronger non‐linearity than χ3 materials, which suggests that higher efficiencies can be achieved. In this work, we will revisit the latest quadratic combs experimental advances, concerning power threshold, span and wavelength conversion efficiency.

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Chipscale optical frequency combs: from soliton physics to coherent communication (Conference Presentation)

Cited by 7 publications

References 0 publications

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

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

Phase-coherent microwave-to-optical link with a self-referenced microcomb

Latest advances in optical frequency combs based on quadratic non‐linearity

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