Optically referenced 300 GHz millimetre-wave oscillator

Tetsumoto, Tomohiro; Nagatsuma, Tadao; Fermann, M. E.; Navickaitė, Gabrielė; Geiselmann, Michael; Rolland, Antoine

doi:10.1038/s41566-021-00790-2

Cited by 109 publications

(77 citation statements)

References 44 publications

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“…Smaller free-running phase noise is important to achieve the lower phase noise with the stabilization because of the limited feedback gain. When stabilized, our result is compared with ref [25]. Our phase noise is slightly better at the frequency offsets of > 10 kHz.…”

Section: Methodsmentioning

confidence: 69%

“…In ref [25], the obtained phase noise is limited by the references, i.e. relative phase noise between two Brillouin lasers, which might be difficult to further improve since a careful enclosure (100 mTorr in a vacuum chamber) for the Brillouin lasers has been already installed.…”

Section: Methodsmentioning

confidence: 99%

“…A mm wave (100 GHz) has been generated from a 100-GHz, free-running Kerr comb, showing a strong coherence between the comb modes [24]. To improve the phase noise, a 300-GHz Kerr comb is stabilized to two Brillouin lasers, where optical frequency division from 3.6 THz (= frequency separation of the two Brillouin lasers) to 300 GHz (= f rep of the Kerr comb) is utilized, suppressing the phase noise by 40 dB in the wide range of frequency offsets for a 300-GHz carrier [25]. However, the method based on Brillouin lasers requires sophisticated experimental conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Low phase noise THz generation from a fiber-referenced Kerr microresonator soliton comb

Kuse¹,

Nishimoto²,

Tao³

et al. 2022

Preprint

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THz oscillators generated via frequency-multiplication of microwaves are facing difficulty in achieving low phase noise. Photonics-based techniques, in which optical two tones are translated to a THz wave through opto-electronic conversion, are promising if the relative phase noise between the two tones is well suppressed. Here, a THz (≈ 560 GHz) wave with an unprecedented phase noise is provided by a frequency-stabilized, dissipative Kerr microresonator soliton comb. The repetition frequency of the comb is stabilized to a long fiber in a two-wavelength delayed self-heterodyne interferometer, significantly reducing the phase noise of the THz wave. A new measurement technique to characterize the phase noise of the THz wave beyond the limit of a frequency-multiplied microwave is also demonstrated, showing the superior phase noise of the THz wave to any other THz oscillators (> 300 GHz).

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Section: Methodsmentioning

confidence: 69%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low phase noise THz generation from a fiber-referenced Kerr microresonator soliton comb

Kuse¹,

Nishimoto²,

Tao³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…A significant number of ongoing research topics, e.g., high-speed photonic analogto-digital conversion [140], dual-comb spectroscopic measurements [141][142][143][144][145][146][147], X-band ultra-low-noise microwave generation [148][149][150][151], and astro-combs [152][153][154][155], require frequency combs with large mode spacing, therefore novel optical frequency combs aim to boost the comb spacing over the GHz level. Representative techniques generating high-repetition-rate laser sources are QCL-based combs [156,157], microcombs [158][159][160], and EO-modulated combs [161,162].…”

Section: Discussionmentioning

confidence: 99%

Noise Measurement and Reduction in Mode-Locked Lasers: Fundamentals for Low-Noise Optical Frequency Combs

Tian

Song

2021

Applied Sciences

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After five decades of development, mode-locked lasers have become significant building blocks for many optical systems in scientific research, industry, and biomedicine. Advances in noise measurement and reduction are motivated for both shedding new light on the fundamentals of realizing ultra-low-noise optical frequency combs and their extension to potential applications for standards, metrology, clock comparison, and so on. In this review, the theoretical models of noise in mode-locked lasers are first described. Then, the recent techniques for timing jitter, carrier-envelope phase noise, and comb-line noise measurement and their stabilization are summarized. Finally, the potential of the discussed technology to be fulfilled in novel optical frequency combs, such as electro-optic (EO) modulated combs, microcombs, and quantum cascade laser (QCL) combs, is envisioned.

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“…Optical frequency comb generators (OFCGs) are optical sources capable of generating multiple phase coherent optical tones evenly spaced across broad optical bandwidths and are a fundamental component in many microwave photonic systems. Applications that have benefited from comb generation span many disciplines including spectroscopy [1], LIDAR [2], THz generation [3], high-speed optical communications [4] and RF over fibre [5]. The required properties for an OFCG are often driven by the application which has resulted in numerous OFCG techniques to be developed.…”

Section: Introductionmentioning

confidence: 99%

InP Photonic Integrated Circuit for 6.7GHz Spaced Optical Frequency Comb Generator

Tough

Fice

Renaud

et al. 2021

2021 International Topical Meeting on Microwave Photonics (MWP)

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We have demonstrated a novel approach to photonically integrated optical frequency comb generation on Indium Phosphide (InP) using generic foundry platforms. The optical comb utilized a recirculating loop technique to generate 59 comb lines (within a 20 dB power envelope) which are separated by 6.7 GHz frequency spacing. All comb lines exhibit strong phase coherence as characterized by low phase noise measurements of -105 dBc/Hz at 100 kHz. The choice of InP as an integration platform allowed for an immediate optical amplification of the modulated sideband tones. This approach reduced the requirement for external high-power RF amplifiers and therefore made the entire system more compact and power efficient. The amplified recirculating loop comb occupied 6 x 0.7 mm 2 area of InP chip and consisted of electro-optic phase modulator (EOPM) and semiconductor optical amplifier (SOA) components embedded within a short (12 mm long) waveguide loop, such that the round-trip loop frequency corresponding to the loop optical length equated to 6.7 GHz. Modulation frequencies equal to the round-trip loop frequency were used to generate broad comb spans.

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Optically referenced 300 GHz millimetre-wave oscillator

Cited by 109 publications

References 44 publications

Low phase noise THz generation from a fiber-referenced Kerr microresonator soliton comb

Low phase noise THz generation from a fiber-referenced Kerr microresonator soliton comb

Noise Measurement and Reduction in Mode-Locked Lasers: Fundamentals for Low-Noise Optical Frequency Combs

InP Photonic Integrated Circuit for 6.7GHz Spaced Optical Frequency Comb Generator

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