Publications by Nikolai Kuznetsov

An Ultra-Broadband Gallium Phosphide Optical Parametric Amplifier

Tobias Kippenberg, Alberto Nardi, Mikhail Churaev, Nikolai Kuznetsov, Alisa Davydova

Optical parametric amplification [1], which utilizes material nonlinearities, has long been considered one approach to increase channel capacity, but the technical complexity of systems using highly nonlinear fibers or bulk waveguides restricts their pract ...

IEEE2025

Coherent Dissipative Structures in Arbitrary Dispersion-Engineered Gallium Phosphide Fabry-Perot Resonators

Tobias Kippenberg, Nikolai Kuznetsov, Alisa Davydova

The diversity of experimentally observed nonlinear coherent and partially coherent optical structures, including breathing, zero-dispersion, and switching wave states in driven optical microresonators, is mainly provided by cavity dispersion engineering. R ...

IEEE2025

Frequency Conversion in Periodically Poled Thin-Film Lithium Tantalate Photonic Integrated Circuits

Tobias Kippenberg, Nikolai Kuznetsov, Zihan Li

Second-order optical nonlinear processes, such as second harmonic generation, difference-frequency generation, or sum-frequency generation, find numerous applications in laser science, quantum technology, sensing, photonic computing, and many other areas. ...

IEEE2025

An ultra-broadband photonic-chip-based parametric amplifier

Tobias Kippenberg, Alberto Nardi, Mikhail Churaev, Nikolai Kuznetsov, Alisa Davydova

Optical amplification, crucial for modern communication, primarily relies on erbium-doped fibre amplifiers (EDFAs)1,2. Yet, EDFAs only cover a portion of the low-loss spectrum of optical fibres. This has motivated the development of amplifiers operating be ...

NATURE PORTFOLIO2025

Travelling-Wave Optical Parametric Amplification in Gallium Phosphide Integrated Waveguides

Tobias Kippenberg, Alberto Nardi, Mikhail Churaev, Nikolai Kuznetsov, Alisa Davydova

We demonstrate integrated optical continuous-travelling-wave parametric amplifiers that significantly surpass the amplification bandwidth of traditional Erbium-Doped Fiber Amplifiers. Using a 5.55-cm-long integrated gallium phosphide waveguide, we achieve ...

SPIE2024

Integrated chirped photonic-crystal cavities in gallium phosphide for broadband soliton generation

Tobias Kippenberg, Miles Henry Anderson, Nikolai Kuznetsov, Alisa Davydova

Chirped mirrors have underpinned advances in ultra-fast lasers based on bulk optics but have yet to be fully exploited in integrated photonics, where they could provide a means to engineer otherwise unattainable dispersion profiles for a range of nonlinear ...

2024

An Integrated Gallium Phosphide Optical Parametric Amplifier

Tobias Kippenberg, Alberto Nardi, Mikhail Churaev, Nikolai Kuznetsov, Alisa Davydova

Optical parametric amplification is a promising alternative to traditional erbium-doped amplifiers, offering unidirectional, low-noise, and broadband amplification. Here we present an integrated continuous-traveling-wave parametric amplifier that surpasses ...

Springer Science and Business Media Deutschland GmbH2024

Wafer-Scale Processing of Ultra-Low-Loss Gallium Phosphide Integrated Photonics

Tobias Kippenberg, Nikolai Kuznetsov

We demonstrate wafer-scale processing of integrated photonic circuits made of gallium phosphide, with propagation losses in waveguides as low as 0.40 dB/cm, and establish new record-high quality factors with resonators on this material platform. ...

Institute of Electrical and Electronics Engineers Inc.2024

Ultrabroadband Integrated Triply Resonant Electro-Optic Frequency Comb in Lithium Tantalate

Tobias Kippenberg, Jianqi Hu, Mikhail Churaev, Nikolai Kuznetsov, Zihan Li, Junyin Zhang

We demonstrated an integrated electro-optic frequency comb generator with 450nm span and 29.6GHz spacing, entirely covering optical telecom E-, S-, C-, L-, and U-bands, via monolithic co-integration of microwave and photonics resonators on thin-film lithiu ...

Optica Publishing Group (formerly OSA)2024

Broadband and high-gain traveling-wave optical parametric amplification in a gallium phosphide photonic integrated circuit

Tobias Kippenberg, Alberto Nardi, Nikolai Kuznetsov, Alisa Davydova

We demonstrate continuous-wave parametric amplifier w ith a 1 40 n m gain bandwidth spanning the optical S,C, and L-bands and up to 25 dB off-chip net-gain in a dispersion engineered gallium phosphide-on-insulator (GaPOI) waveguide with up to 160 mW output ...

Institute of Electrical and Electronics Engineers Inc.2024

Broadband and high-gain continuous-wave parametric amplification in a Gallium Phosphide waveguide

Tobias Kippenberg, Alberto Nardi, Mikhail Churaev, Nikolai Kuznetsov, Alisa Davydova

We demonstrate the first broadband and high gain third-order parametric optical amplifier in a 5.5 cm long GaP waveguide spiral with up to 25 dB net gain off-chip and more than 10 dB amplification over a bandwidth of 140 nm. ...

Institute of Electrical and Electronics Engineers Inc.2024

An Integrated Gallium Phosphide Travelling-Wave Optical Parametric Amplifier

Tobias Kippenberg, Alberto Nardi, Mikhail Churaev, Nikolai Kuznetsov, Alisa Davydova

We demonstrate optical continuous-travelling-wave parametric amplification in a 5.55-cm-long integrated gallium phosphide waveguide, achieving up to 35 dB of gain and significantly surpassing the bandwidth of erbium-doped fiber amplifiers. ...

Optical Society of America2024

Soliton Generation in a Gallium Phosphide Photonic-Crystal Fabry-Perot Microresonator

Tobias Kippenberg, Miles Henry Anderson, Alberto Nardi, Nikolai Kuznetsov, Alisa Davydova

Ring resonators have proven to be extremely successful for generation of temporal dissipative Kerr solitons, but their dispersion engineering is limited. We present a photonic-crystal Fabry-Perot resonator with record-high quality factors in gallium phosph ...

IEEE2023

Soliton Microcomb Generation in a Gallium Phosphide Photonic Crystal Cavity

Tobias Kippenberg, Miles Henry Anderson, Nikolai Kuznetsov, Alisa Davydova

We report broadband bright soliton microcomb generation in the emerging platform gallium phosphide on insulator. We demonstrate a broadband dispersion-engineered photonic-crystal Fabry-Perot resonator with record-high quality factors. ...

Optical Society of America2023

High density lithium niobate photonic integrated circuits

Rui Ning Wang, Tobias Kippenberg, Mikhail Churaev, Anat Siddharth, Zelin Tan, Nikolai Kuznetsov, Zihan Li, Junyin Zhang

Photonic integrated circuits have the potential to pervade into multiple applications traditionally limited to bulk optics. Of particular interest for new applications are ferroelectrics such as Lithium Niobate, which exhibit a large Pockels effect, but ar ...

Nature Portfolio2023

Time-continuous Travelling-Wave Optical Parametric Amplification in a Photonic Circuit

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Jijun He, Nikolai Kuznetsov

We demonstrate a traveling wave parametric amplifier in a photonic Si3N4 integrated spiral waveguide of 2.0 m length with footprint 3x5 mm. We achieve net gain of 7 dB on-chip and 2 dB fiberto-fiber in the optical C-band. (C) 2022 The Author(s) ...

IEEE2022

A photonic integrated continuous-travelling-wave parametric amplifier

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Jijun He, Nikolai Kuznetsov

The ability to amplify optical signals is of pivotal importance across science and technology typically using rare-earth-doped fibres or gain media based on III-V semiconductors. A different physical process to amplify optical signals is to use the Kerr no ...

NATURE PORTFOLIO2022