scholarly journals Normal-dispersion microresonator Kerr frequency combs

Nanophotonics ◽  
2016 ◽  
Vol 5 (2) ◽  
pp. 244-262 ◽  
Author(s):  
Xiaoxiao Xue ◽  
Minghao Qi ◽  
Andrew M. Weiner
Keyword(s):  
Velocity Dispersion ◽  
Frequency Comb ◽  
Group Velocity Dispersion ◽  
Research Area ◽  
Future Directions ◽  
Normal Dispersion ◽  
Frequency Combs ◽  
The Past ◽  
Dispersion Regime ◽  
Comb Generation

AbstractOptical microresonator-based Kerr frequency comb generation has developed into a hot research area in the past decade. Microresonator combs are promising for portable applications due to their potential for chip-level integration and low power consumption. According to the group velocity dispersion of the microresonator employed, research in this field may be classified into two categories: the anomalous dispersion regime and the normal dispersion regime. In this paper, we discuss the physics of Kerr comb generation in the normal dispersion regime and review recent experimental advances. The potential advantages and future directions of normal dispersion combs are also discussed.

scholarly journals Spectral extension and synchronization of microcombs in a single microresonator

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Shuangyou Zhang ◽  
Jonathan M. Silver ◽  
Toby Bi ◽  
Pascal Del’Haye
Keyword(s):  
Repetition Rate ◽  
Optical Pulse ◽  
Frequency Comb ◽  
Optical Power ◽  
Normal Dispersion ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Dispersion Regime ◽  
Telecom Networks ◽  
Selective Enhancement

AbstractBroadband optical frequency combs are extremely versatile tools for precision spectroscopy, ultrafast ranging, as channel generators for telecom networks, and for many other metrology applications. Here, we demonstrate that the optical spectrum of a soliton microcomb generated in a microresonator can be extended by bichromatic pumping: one laser with a wavelength in the anomalous dispersion regime of the microresonator generates a bright soliton microcomb while another laser in the normal dispersion regime both compensates the thermal effect of the microresonator and generates a repetition-rate-synchronized second frequency comb. Numerical simulations agree well with experimental results and reveal that a bright optical pulse from the second pump is passively formed in the normal dispersion regime and trapped by the primary soliton. In addition, we demonstrate that a dispersive wave can be generated and influenced by cross-phase-modulation-mediated repetition-rate synchronization of the two combs. The demonstrated technique provides an alternative way to generate broadband microcombs and enables the selective enhancement of optical power in specific parts of a comb spectrum.

Efficient octave-spanning frequency comb generation in normal dispersion regime

2018 ◽  
Author(s):  
Minghui Yang ◽  
Lin Zhang ◽  
Guifang Li ◽  
Alan E. Willner ◽  
Yuhao Guo ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Normal Dispersion ◽  
Dispersion Regime ◽  
Comb Generation

scholarly journals Dynamics of microresonator frequency comb generation: models and stability

Nanophotonics ◽  
2016 ◽  
Vol 5 (2) ◽  
pp. 231-243 ◽  
Author(s):  
Tobias Hansson ◽  
Stefan Wabnitz
Keyword(s):  
Continuous Wave ◽  
Temporal Dynamics ◽  
Frequency Comb ◽  
Modulational Instability ◽  
Theoretical Models ◽  
Light Sources ◽  
Generation Process ◽  
Modal Expansion ◽  
Frequency Combs ◽  
Comb Generation

AbstractMicroresonator frequency combs hold promise for enabling a new class of light sources that are simultaneously both broadband and coherent, and that could allow for a profusion of potential applications. In this article, we review various theoretical models for describing the temporal dynamics and formation of optical frequency combs. These models form the basis for performing numerical simulations that can be used in order to better understand the comb generation process, for example helping to identify the universal combcharacteristics and their different associated physical phenomena. Moreover, models allow for the study, design and optimization of comb properties prior to the fabrication of actual devices. We consider and derive theoretical formalisms based on the Ikeda map, the modal expansion approach, and the Lugiato-Lefever equation. We further discuss the generation of frequency combs in silicon resonators featuring multiphoton absorption and free-carrier effects. Additionally, we review comb stability properties and consider the role of modulational instability as well as of parametric instabilities due to the boundary conditions of the cavity. These instability mechanisms are the basis for comprehending the process of frequency comb formation, for identifying the different dynamical regimes and the associated dependence on the comb parameters. Finally, we also discuss the phenomena of continuous wave bi- and multistability and its relation to the observation of mode-locked cavity solitons.

scholarly journals pyLLE: A Fast and User Friendly Lugiato-Lefever Equation Solver

2019 ◽  
Vol 124 ◽  
Author(s):  
Gregory Moille ◽  
Qing Li ◽  
Lu Xiyuan ◽  
Kartik Srinivasan
Keyword(s):  
Programming Language ◽  
Frequency Comb ◽  
Mean Field ◽  
Dissipative Structures ◽  
Optical Systems ◽  
User Friendliness ◽  
Frequency Combs ◽  
Nonlinear Resonator ◽  
Comb Generation ◽  
Python Programming

The Lugiato-Lefever Equation (LLE), first developed to provide a description of spatial dissipative structures in optical systems, has recently made a significant impact in the integrated photonics community, where it has been adopted to help understand and predict Kerr-mediated nonlinear optical phenomena such as parametric frequency comb generation inside microresonators. The LLE is essentially an application of the nonlinear Schrodinger equation (NLSE) to a damped, driven Kerr nonlinear resonator, so that a periodic boundary condition is applied. Importantly, a slow-varying time envelope is stipulated, resulting in a mean-field solution in which the field does not vary within a round trip. This constraint, which differentiates the LLE from the more general Ikeda map, significantly simplifies calculations while still providing excellent physical representation for a wide variety of systems. In particular, simulations based on the LLE formalism have enabled modeling that quantitatively agrees with reported experimental results on microcomb generation (e.g., in terms of spectral bandwidth), and have also been central to theoretical studies that have provided better insight into novel nonlinear dynamics that can be supported by Kerr nonlinear microresonators. The great potential of microresonator frequency combs (microcombs) in a wide variety of applications suggests the need for efficient and widely accessible computational tools to more rapidly further their development. Although LLE simulations are commonly performed by research groups working in the field, to our knowledge no free software package for solving this equation in an easy and fast way is currently available. Here, we introduce pyLLE, an open-source LLE solver for microcomb modeling. It combines the user-friendliness of the Python programming language and the computational power of the Julia programming language.

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