Improved signal-to-noise ratio of 10 GHz microwave signals generated with a mode-filtered femtosecond laser frequency comb.
Scott A. Diddams,Matthew S. Kirchner,Tara M. Fortier,Danielle Braje,Andrew M. Weiner,Leo W. Hollberg +5 more
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A Fabry-Perot cavity is used to optically filter the output of a Ti:sapphire frequency comb to integer multiples of the original 1 GHz mode spacing, which effectively increases the pulse repetition rate, which is useful for several applications.Abstract:
We use a Fabry-Perot cavity to optically filter the output of a Ti:sapphire frequency comb to integer multiples of the original 1 GHz mode spacing. This effectively increases the pulse repetition rate, which is useful for several applications. In the case of low-noise microwave signal generation, such filtering leads to improved linearity of the high-speed photodiodes that detect the mode-locked laser pulse train. The result is significantly improved signal-to-noise ratio at the 10 GHz harmonic with the potential for a shot-noise limited single sideband phase noise floor near -168 dBc/Hz.read more
Citations
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Generation of ultrastable microwaves via optical frequency division
Tara M. Fortier,Matthew S. Kirchner,Franklyn Quinlan,Jacob M. Taylor,J. C. Bergquist,Till Rosenband,Nathan D. Lemke,Andrew D. Ludlow,Yanyi Jiang,Christopher W. Oates,Scott A. Diddams +10 more
TL;DR: In this paper, a microwave generator based on a high-Q optical resonator and a frequency comb functioning as an optical-to-microwave divider was demonstrated, with a fractional frequency instability of ≤ 8 × 10−16 at 1 s.
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The evolving optical frequency comb [Invited]
TL;DR: In the past decade, the optical frequency comb has further evolved into a valuable tool for a wide range of applications, including ultraviolet and infrared spectroscopy, frequency synthesis, optical and microwave waveform generation, astronomical spectrograph calibration, and attosecond pulse generation.
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Microplastics and seafood: lower trophic organisms at highest risk of contamination.
TL;DR: A semi-systematic review of studies investigating the number of microplastic found in commercially important organisms of different trophic levels suggests that microplastics do not biomagnify, and that organisms at lower troPHic levels are more likely to contaminated by micropl Plastic pollution than apex predators.
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A multi-branch, fiber-based frequency comb with millihertz-level relative linewidths using an intra-cavity electro-optic modulator
Yoshiaki Nakajima,Hajime Inaba,Kazumoto Hosaka,Kaoru Minoshima,Atsushi Onae,Masami Yasuda,Takuya Kohno,Sakae Kawato,Takao Kobayashi,Toshio Katsuyama,Feng-Lei Hong +10 more
TL;DR: It is demonstrated that fiber-based frequency combs with multi-branch configurations can transfer both linewidth and frequency stability to another wavelength at the millihertz level and the frequency noise in the out-of-loop beat originates mainly from phase noise in branched optical fibers.
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Characterization of Power-to-Phase Conversion in High-Speed P-I-N Photodiodes
Jacob M. Taylor,Shubhashish Datta,Archita Hati,Craig W. Nelson,Franklyn Quinlan,Abhay Joshi,Scott A. Diddams +6 more
TL;DR: In this paper, the photonic generation of low-phase noise 10-GHz microwave signals was investigated and it was shown that a combination of low laser amplitude noise, appropriate photodiode design, and optimum average photocurrent is required to achieve phase noise at or below -100 dBc/Hz at 1 Hz offset for a 10 GHz carrier.
References
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Quantum projection noise in an atomic fountain: a high stability cesium frequency standard
Giorgio Santarelli,Ph. Laurent,Pierre Lemonde,André Clairon,Anthony Mann,S. Chang,Andre N. Luiten,Christophe Salomon +7 more
TL;DR: In this article, an ultrastable cryogenic sapphire oscillator is used to measure the short-term frequency stability of the fountain as a function of the number of detected atoms.
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Adaptive RF-photonic arbitrary waveform generator
Jason Chou,Yan Han,Bahram Jalali +2 more
TL;DR: In this article, the authors used spectral shaping of a supercontinuum source followed by wavelength-to-time mapping to generate ultra wideband RF waveforms with arbitrary modulation and employed adaptive computer control to mitigate the non-ideal features inherent in the optical source and in the spectrum modulation process.
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Photonic synthesis of broadband microwave arbitrary waveforms applicable to ultra-wideband communication
TL;DR: In this paper, photonic synthesis of broadband radio-frequency (RF) waveforms suitable for ultra-wide bandwidth (UWB) systems via open-loop reflection-mode dispersive Fourier transform optical pulse shaping was demonstrated.
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Octave-spanning Ti:sapphire laser with a repetition rate >1 ghz for optical frequency measurements and comparisons.
TL;DR: The frequency comb output of the Ti:sapphire laser is used for simultaneous measurements against atomic optical standards at 534, 578, 563, and 657 nm and to stabilize the laser offset frequency.
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Femtosecond-laser-based synthesis of ultrastable microwave signals from optical frequency references.
A. Bartels,Scott A. Diddams,Christopher W. Oates,G. Wilpers,James C. Bergquist,Windell H. Oskay,Leo W. Hollberg +6 more
TL;DR: Femtosecond laser frequency combs are used to convert optical frequency references to the microwave domain, where the synthesis of 10-GHz signals having a fractional frequency instability of < or =3.3 fs is demonstrated.