Article
Optics
Rihards Murnieks, Toms Salgals, Janis Alnis, Armands Ostrovskis, Oskars Ozolins, Inga Brice, Arvids Sedulis, Kristians Draguns, Ilya Lyashuk, Roberts Berkis, Aleksejs Udalcovs, Toby Bi, Xiaodan Pang, Jurgis Porins, Sandis Spolitis, Pascal Del'haye, Vjaceslavs Bobrovs
Summary: Conventional data center interconnects face challenges in terms of power and spectral efficiency due to growing bandwidth demand. Kerr frequency combs based on silica microresonators can alleviate this pressure by replacing multiple laser arrays. In our experimental demonstration, we achieve a record bit rate of up to 100 Gbps/λ using a silica micro-rod-based Kerr frequency comb light source for a 2 km long short-reach optical interconnect. Additionally, we demonstrate data transmission of 60 Gbps/λ using non-return to zero on-off keying modulation. The Kerr frequency comb light source based on the silica micro-rod resonator generates an optical frequency comb in the optical C-band with 90 GHz spacing between optical carriers. Frequency domain pre-equalization techniques and offline digital signal processing further enhance the achievable results.
Article
Multidisciplinary Sciences
Bok Young Kim, Jae K. Jang, Yoshitomo Okawachi, Xingchen Ji, Michal Lipson, Alexander L. Gaeta
Summary: In this study, all-optical synchronization of Kerr combs is demonstrated in the nonsolitonic, normal GVD regime, generating phase-locked combs with high pump-to-comb conversion efficiencies and relatively flat spectral profiles. The results reveal the universality of Kerr comb synchronization and suggest a promising path towards coherently combined normal GVD Kerr combs with spectrally flat profiles and high comb-line powers in an efficient microresonator platform.
Article
Optics
Zeyu Xiao, Tieying Li, Minglu Cai, Hongyi Zhang, Yi Huang, Chao Li, Baicheng Yao, Kan Wu, Jianping Chen
Summary: The advances in microresonator-based Kerr cavity solitons have enabled versatile applications. The dispersion of the resonator plays a crucial role in the Kerr comb dynamics. This study investigates the dynamics of microcombs in a fiber-based Fabry-Perot microresonator with ultra-small anomalous group-velocity-dispersion (GVD). The study discovers 2/3-octave-spanning microcombs in the modulational instability (MI) state and the first observation of anomalous-dispersion based near-zero-dispersion solitons.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Physics, Multidisciplinary
Abdesselam Bouguerra, Houria Triki, Chun Wei, Zhenbang Lu, Qin Zhou
Summary: In this study, we investigate the existence and stability of envelope solitons in a non-Kerr quintic optical material with a self-steepening effect. We find that the material supports various localized waveforms with an important frequency chirping property, and the amplitude can be controlled by the self-steepening parameter.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2023)
Article
Optics
Miles H. Anderson, Romain Bouchand, Junqiu Liu, Wenle Weng, Ewelina Obrzud, Tobias Herr, Tobias J. Kippenberg
Summary: Supercontinuum generation and soliton microcomb formation are key techniques for coherent, ultrabroad optical frequency combs, but they differ in their efficiency and application in the microwave domain. Bridging the efficiency gap between the two approaches by driving a dispersion-engineered photonic-chip-based microresonator can achieve high-efficiency soliton microcomb generation and frequency conversion.
Article
Physics, Applied
Wenle Weng, Jijun He, Aleksandra Kaszubowska-Anandarajah, Prince M. Anandarajah, Tobias J. Kippenberg
Summary: This study successfully captures the dissipative Kerr solitons generated in a crystalline optical microresonator using the phase-modulation-induced potential gradient technique, and achieves side-mode suppression of the microwave signal through photodetection. The hybrid system simultaneously produces a drift-reduced microcomb and a spectrum-purified optoelectronic oscillator, providing a low-cost solution for microwave and optical metrology.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Sauradeep Kar, Maitrayee Saha, Saawan Kumar Bag, Rajat K. Sinha, Shubhanshi Sharma, Sridhar Singhal, Shailendra K. Varshney
Summary: This paper reports an innovative and simple approach to achieve stable Kerr frequency combs (KFCs) using a Si3N4 racetrack microring resonator. Intensive numerical simulations reveal an enhancement of the comb bandwidth when the temperature is slightly lower than room temperature. The maximum temperature rise caused by the propagating dissipative Kerr soliton (DKS) is also studied through finite element simulations. Homogeneous steady-state analysis confirms the enhanced stability of a single DKS state at the reported temperatures.
Article
Optics
Christopher Spiess, Qian Yang, Xue Dong, Victor G. Bucklew, William H. Renninger
Summary: Solitons are self-sustaining particle-like wave packets found throughout nature. A new class of optical solitons with pulses characterized by large and positive chirp in normal dispersion resonators with strong spectral filtering is introduced. Numerical simulations and experimental observations show stable waveforms, including dissipative solitons characterized by large frequency chirp, with potential applications in spectroscopy, communications, and metrology.
Article
Optics
Kewei Liu, Zihao Wang, Shunyu Yao, Yanan Guo, Jianchan Yan, Junxi Wang, Changxi Yang, Chengying Bao
Summary: By engineering the laser sweep waveform, AlNon-sapphire soliton microcombs with an intermediate sweep speed were generated and stabilized using different laser sweep methods. Reducing the soliton number was found to be effective in stabilizing the solitons during fast laser sweep.
PHOTONICS RESEARCH
(2023)
Article
Multidisciplinary Sciences
N. Moroney, L. Del Bino, S. Zhang, M. T. M. Woodley, L. Hill, T. Wildi, V. J. Wittwer, T. Sudmeyer, G-L Oppo, M. R. Vanner, V Brasch, T. Herr, P. Del'Haye
Summary: The authors demonstrate an all-optical method to control the polarization of light using the Kerr nonlinearity in an optical resonator. They show that the Kerr effect can be utilized to control the polarization of continuous wave lasers in a high-finesse Fabry-Perot resonator. This research has implications for polarization control in photonic circuits and the development of polarization filters and sensors.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Xue Dong, Zhiqiang Wang, William H. Renninger
Summary: In this study, we address the limitations of fiber Kerr resonators in generating longer pulses and complicated techniques for single-pulse generation. By demonstrating fiber Kerr resonators based on stretched-pulse solitons, we achieve robust single-pulse performance with 120-fs pulse durations. The performance of stretched-pulse solitons strongly depends on the total cavity length, and an optimized length is found to be crucial for achieving stable stretched-pulse solitons.
Article
Mathematics, Applied
Naresh Saha, Barnana Roy, Avinash Khare
Summary: In this study, the existence and stability properties of chirped gray and anti-dark solitary waves in a coupled cubic nonlinear Helmholtz equation with self-steepening and a self-frequency shift were investigated. It was found that different combinations of self-steepening and self-frequency shift parameters can lead to chirping and chirp reversal. Additionally, the influence of a nonparaxial parameter on physical quantities of the solitary waves such as intensity, speed, and pulse width was examined, with the discovery that the speed of the solitary waves can be tuned by altering the nonparaxial parameter.
Article
Optics
Runlin Miao, Chenxi Zhang, Xin Zheng, Xiang'ai Cheng, Ke Yin, Tian Jiang
Summary: In this research, a novel method combining rapid frequency sweep with optical sideband thermal compensation is proposed to achieve stable generation of single-soliton state and significantly reduce phase and frequency noise. The study also demonstrates high stability of repetition rate and linear scanning achieved by closing the locking loop. This research provides important methods and directions for the generation and application of single-soliton microcombs.
PHOTONICS RESEARCH
(2022)
Article
Optics
Francesco Rinaldo Talenti, Yifan Sun, Pedro Parra-Rivas, Tobias Hansson, Stefan Wabnitz
Summary: The impact of chirped driving fields on Kerr cavity breathers and solitons is investigated, and it is found that synchronous phase and amplitude modulation of the pumping field can be used to control soliton dynamics. The use of a phase-modulated super-Gaussian pump is shown to stabilize the oscillations of breathing solitons and generate prescribed temporal intra-cavity patterns. These findings have applications in deterministic generation of optical frequency soliton combs, optical tweezers, and all-optical manipulation of light pulses.
OPTICS COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Yan Bai, Menghua Zhang, Qi Shi, Shulin Ding, Yingchun Qin, Zhenda Xie, Xiaoshun Jiang, Min Xiao
Summary: By generating a Brillouin laser in an optical microresonator and exciting the Kerr frequency comb in the same cavity, a soliton Kerr microcomb was achieved with narrow-linewidth comb lines and stable repetition rate. The system also demonstrated a low-noise microwave signal with excellent phase noise characteristics, showing promising practical applications.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Melissa A. Guidry, Daniil M. Lukin, Ki Youl Yang, Rahul Trivedi, Jelena Vuckovic
Summary: This study utilizes second-order photon correlations to investigate the quantum processes of soliton microcombs in an integrated silicon carbide microresonator, showing that a stable temporal lattice of solitons can achieve all-to-all entanglement.
Article
Optics
C. Shirpurkar, J. Zang, K. Y. Yang, D. Carlson, S. P. Yu, E. Lucas, S. Pericherla, J. Yang, M. Guidry, D. Lukin, G. H. Ahn, J. Lu, L. Trask, F. Aflatouni, J. Vuckovic, S. B. Papp, P. J. Delfyett
Summary: The experimental demonstration presents a 400 Gbit/s optical communication link utilizing wavelength-division multiplexing and mode-division multiplexing, with a novel 400 GHz frequency comb source and 4x4 mode-division multiplexer structures for increased data capacity.
Article
Nanoscience & Nanotechnology
Geun Ho Ahn, Ki Youl Yang, Rahul Trivedi, Alexander D. White, Logan Su, Jinhie Skarda, Jelena Vuckovic
Summary: The automation of device design in photonics has been revolutionary, but the design of resonant devices has remained challenging due to their complex optimization landscapes. In this study, we propose a framework that maps the design of photonic resonators to nonresonant design problems, enabling flexible dispersion engineering and high-quality operation. The effectiveness of this framework is demonstrated both theoretically and experimentally.
Article
Multidisciplinary Sciences
Avik Dutt, Luqi Yuan, Ki Youl Yang, Kai Wang, Siddharth Buddhiraju, Shanhui Fan
Summary: The authors propose a straightforward method to construct sharp boundaries in synthetic dimensions using a modulated ring resonator strongly coupled to an auxiliary ring. Various effects associated with such boundaries are explored, and the demonstration of sharp boundaries expands the capability of exploring topological physics, with applications in classical and quantum information processing in synthetic frequency dimensions.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Su-Peng Yu, Erwan Lucas, Jizhao Zang, Scott B. Papp
Summary: This study demonstrates a continuum from dark pulse to bright pulse states in a Kerr-nonlinear resonator with normal dispersion and photonic crystal ring resonators, and explores the underlying mechanism and physical roles.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Kaikai Liu, Nitesh Chauhan, Jiawei Wang, Andrei Isichenko, Grant M. Brodnik, Paul A. Morton, Ryan O. Behunin, Scott B. Papp, Daniel J. Blumenthal
Summary: Laser stabilization is crucial for precision scientific experiments and applications. This study presents a significant advancement in integrated laser linewidth narrowing and noise reduction using a photonic integrated coil resonator to stabilize a semiconductor laser.
Article
Nanoscience & Nanotechnology
Alexander D. White, Logan Su, Daniel I. Shahar, Ki Youl Yang, Geun Ho Ahn, Jinhie L. Skarda, Siddharth Ramachandran, Jelena Vuckovic
Summary: Vortex beams are stable solutions of Maxwell's equations that have phase singularities and orbital angular momentum. They have unique properties and find applications in various fields. This study presents a general framework for generating integrated vortex beam emitters using photonic inverse design. Experimental demonstrations and the design of a vortex beam multiplexer are shown. The foundry-fabricated beam emitters with wide bandwidths and high efficiencies are also described.
Article
Optics
Kaikai Liu, John H. Dallyn, Grant M. Brodnik, Andrei Isichenko, Mark W. Harrington, Nitesh Chauhan, Debapam Bose, Paul A. Morton, Scott B. Papp, Ryan O. Behunin, Daniel J. Blumenthal
Summary: The research reports a significant advancement in the integration of stabilized lasers, where a waveguide Brillouin laser was stabilized to a waveguide reference cavity using the same CMOS-compatible integration platform. The achieved performance demonstrates high stability and low noise for various applications.
Article
Optics
Alexander D. White, Geun Ho Ahn, Kasper Van Gasse, Ki Youl Yang, Lin Chang, John E. Bowers, Jelena Vuckovic
Summary: This article demonstrates an integrated approach for passively isolating a continuous-wave laser using the non-reciprocal Kerr nonlinearity in ring resonators. By using silicon nitride as the model platform, the authors achieve single ring isolation of 17-23 dB with 1.8-5.5 dB insertion loss, and cascaded ring isolation of 35 dB with 5 dB insertion loss. They also demonstrate hybrid integration and isolation with a semiconductor laser chip using these devices.
Article
Multidisciplinary Sciences
Ki Youl Yang, Chinmay Shirpurkar, Alexander D. White, Jizhao Zang, Lin Chang, Farshid Ashtiani, Melissa A. Guidry, Daniil M. Lukin, Srinivas V. Pericherla, Joshua Yang, Hyounghan Kwon, Jesse Lu, Geun Ho Ahn, Kasper Van Gasse, Yan Jin, Su-Peng Yu, Travis C. Briles, Jordan R. Stone, David R. Carlson, Hao Song, Kaiheng Zou, Huibin Zhou, Kai Pang, Han Hao, Lawrence Trask, Mingxiao Li, Andy Netherton, Lior Rechtman, Jeffery S. Stone, Jinhee L. Skarda, Logan Su, Dries Vercruysse, Jean-Philippe W. MacLean, Shahriar Aghaeimeibodi, Ming-Jun Li, David A. B. Miller, Dan M. Marom, Alan E. Willner, John E. Bowers, Scott B. Papp, Peter J. Delfyett, Firooz Aflatouni, Jelena Vuckovic
Summary: The article presents a novel integrated multi-dimensional communication scheme that combines wavelength- and mode- multiplexing on a silicon photonic circuit, achieving a data transmission rate of up to 1.12Tb/s. The approach is scalable and complies with process design rules for standard silicon photonic foundries.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Chad Ropp, Wenqi Zhu, Alexander Yulaev, Daron Westly, Gregory Simelgor, Akash Rakholia, William Lunden, Dan Sheredy, Martin M. Boyd, Scott Papp, Amit Agrawal, Vladimir Aksyuk
Summary: The commercialization of atomic technologies requires compact and manufacturable optical platforms. This work combines integrated photonics and metasurface optics to create a compact strontium atomic clock. The design includes twelve beams and two co-propagating beams, allowing scalability to an arbitrary number of beams.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Melissa A. Guidry, Daniil M. Lukin, Ki Youl Yang, Jelena Vuckovic
Summary: In this work, we theoretically study the collective dynamics of the quantum fluctuations of soliton microcombs, which are self-organized pulses of light sustained in driven Kerr microresonators. We find that a dissipative Kerr soliton crystal is accompanied by pulses of squeezed multimode vacuum and derives its operational stability from the strong detuning of the below-threshold parametric process. We present a photonic architecture that enables independent control of the above-and below-threshold states and achieves a high degree of squeezing (>15 dB) in the output waveguide with realistic losses.
Article
Optics
Joshua Yang, Melissa A. Guidry, Daniil M. Lukin, Kiyoul Yang, Jelena Vuckovic
Summary: Inverse design has brought revolutionary changes to the field of photonics by automating the development of complex structures with unique functionalities. However, its application in nonlinear photonics has been limited. In this study, we demonstrate quantum and classical nonlinear light generation in silicon carbide nanophotonic inverse-designed Fabry-Perot cavities, showcasing the power of inverse design for nonlinear optics.
LIGHT-SCIENCE & APPLICATIONS
(2023)