61 citations · 380 across the 17 of their papers we have counts for
18 papers
Low-nonlinearity advantage of hollow-core fiber for wavelength multiplexing of quantum entanglement and classical DWDM signals
Hikaru Shimizu, Arisa Ohno, Mao Miyasugi +7
Coexistence of classical and quantum light in optical fiber is a key requirement for scalable quantum networks. However, it is fundamentally limited by nonlinear crosstalk from int…
Transmission of signals in the 300 GHz band with a bit-error rate below using a soliton comb
Mantaro Imamura, Ryo Sugano, Ayaka Yomoda +5
To address the increasing demand for ultra-high-capacity wireless communication, terahertz (THz) frequencies near 300 GHz are attracting attention as a new spectral frontier. This…
Record-high-Q AMTIR-1 microresonators for mid- to long-wave infrared nonlinear photonics
Liu Yang, Ryo Sugano, Ryomei Takabayashi +6
AMTIR-1 chalcogenide glass has shown its potential for use in thermal imaging systems owing to its low refractive index, thermal resistance and high transparency across the infrare…
Architecture for coherent dual-comb spectroscopy and low-noise photonic microwave generation using mechanically actuated soliton microcombs
Tatsuki Murakami, Koshiro Wada, Soma Kogure +8
Dissipative Kerr soliton microcombs have inspired various intriguing applications such as spectroscopy, ranging, telecommunication, and high purity microwave generation. Mechanical…
Scalable fabrication of erbium-doped high-Q silica microtoroid resonators via sol-gel coating
Riku Imamura, Shun Fujii, Keigo Nagashima +1
This study explores sol-gel methods for fabricating erbium-doped silica microtoroid resonators, addressing the limitations of conventional doping techniques and enhancing device sc…
Exceptional point proximity-driven mode-locking in coupled microresonators
Riku Imamura, Shun Fujii, Ayata Nakashima +1
We show theoretically and numerically that mode-locking is feasible with a coupled-cavity system with gain and loss, notably, without any natural saturable absorber. We highlight t…
Mechanically actuated Kerr soliton microcombs
Shun Fujii, Koshiro Wada, Soma Kogure +1
Mode-locked ultrashort pulse sources with a repetition rate of up to several tens of gigahertz greatly facilitate versatile photonic applications such as frequency synthesis, metro…
Versatile tuning of Kerr soliton microcombs in crystalline microresonators
Shun Fujii, Koshiro Wada, Ryo Sugano +4
Microresonator-based optical frequency combs emitted from high-quality-factor microresonators, also known as microcombs, have opened up new horizons to areas of optical frequency c…
Deterministic generation of a perfect soliton crystal with a saturable absorber
Ayata Nakashima, Shun Fujii, Riku Imamura +2
We numerically investigate the deterministic generation of a perfect soliton crystal (PSC) in an optical microresonator functionalized with a saturable absorber (SA). The SA allows…
Dissipative Kerr soliton microcombs for FEC-free optical communications over 100 channels
Shun Fujii, Shuya Tanaka, Tamiki Ohtsuka +11
The demand for high-speed and highly efficient optical communication techniques has been rapidly growing due to the ever-increasing volume of data traffic. As well as the digital c…
Design of a passively mode-locking whispering gallery mode microaser
Tomoki S. L. Prugger Suzuki, Ayata Nakashima, Keigo Nagashima +6
Ultrahigh repetition rate lasers will become vital light sources for many future technologies; however, their realization is challenging because the cavity size must be minimized.…
Ultrahigh-Q crystalline microresonator fabrication with only precision machining
Shun Fujii, Yuka Hayama, Kosuke Imamura +3
The development of ultrahigh quality factor (Q) microresonators has been driving such technologies as cavity quantum electrodynamics (QED), high-precision sensing, optomechanics, a…
Coupling of a whispering gallery mode to a silicon chip with photonic crystal
Yuyang Zhuang, Hajime Kumazaki, Shun Fujii +5
We demonstrate the efficient coupling (99.5%) of a silica whispering gallery mode microresonator directly with a silicon chip by using a silicon photonic crystal waveguide as a cou…
Octave-wide phase-matched four-wave mixing in dispersion engineered crystalline microresonators
Shun Fujii, Shuya Tanaka, Mika Fuchida +5
In this Letter, we report phase-matched four-wave mixing separated by over one-octave in a dispersion engineered crystalline microresonator. Experimental and numerical results pres…
Brillouin lasing in coupled silica toroid microcavities
Yoshihiro Honda, Wataru Yoshiki, Tomohiro Tetsumoto +4
We demonstrate stimulated Brillouin scattering (SBS) lasing in a strongly coupled microcavity system. By coupling two silica toroid microcavities, we achieve large mode splitting o…
Broadband gain induced Raman comb formation in a silica microresonator
Ryo Suzuki, Akihiro Kubota, Atsuhiro Hori +2
A high-Q silica whispering-gallery mode microresonator is an attractive platform on which to demonstrate a broad and phase-locked Raman comb in various wavelength regimes. Raman co…
Transition between Kerr comb and stimulated Raman comb in a silica whispering gallery mode microcavity
Shun Fujii, Takumi Kato, Ryo Suzuki +2
We theoretically and experimentally investigated the transition between modulation instability and Raman gain in a small silica microcavity with a large free-spectral range (FSR),…
The effect on Kerr comb generation in a clockwise and counter-clockwise mode coupled microcavity
Shun Fujii, Atsuhiro Hori, Takumi Kato +5
We study the impact of inherent mode coupling between clockwise (CW) and counter-clockwise (CCW) modes on Kerr comb generation in a small whispering-gallery mode microcavity. Our n…