Synchronization of an optical frequency comb and a microwave oscillator with -174 dBc/Hz noise floor

Ahn, Changmin; Na, Yongjin; Kim, Jungwon

doi:10.1364/cleo_si.2021.sth1c.5

Cited by 4 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here the EOS-TD can detect the relative timing and TOF changes between optical pulses and frequencylocked periodic electric waveforms, such as photocurrent pulses derived from high-speed photodetection 40 or timing-synchronized microwave signals 36,38,41 , with attosecond-level resolution. While the EOS-TD was recently used to measure the single-point TOF of ~ 300-fs-long optical pulses with sub-nanometre resolution 42 , in this work, we showed that sub-nanometre axial resolution can be obtained for sub-pulses with > 90 ps pulse width as well, allowing massively parallel TOF detection of > 1000 subpulses over a several mm-long horizontal coordinate.…”

Section: Resultsmentioning

confidence: 99%

Massively parallel electro-optic sampling of space-encoded optical pulses for ultrafast multi-dimensional imaging

Kim

Kwak

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

High-speed and high-resolution imaging of surface profiles is critical for the investigation of various structures and mechanical dynamics of micro- and nano-scale devices. In particular, recent emergence of various nonlinear, transient and complex mechanical dynamics, such as anharmonic vibrations in mechanical resonators, has necessitated real-time surface deformation imaging with higher axial and lateral resolutions, speed, and dynamic range. However, real-time capturing of fast and complex mechanical dynamics has been challenging, and direct time-domain imaging of displacements and mechanical motions has been a missing element in studying full-field structural and dynamic behaviours. Here, by exploiting the electro-optic sampling with a frequency comb, we demonstrate a line-scan time-of-flight (TOF) camera that can simultaneously measure the TOF changes of more than 1000 spatial coordinates with hundreds megapixels/s pixel-rate and sub-nanometre axial resolution over several millimetres field-of-view. This unique combination of performances enables fast and precise imaging of both complex structures and dynamics in three-dimensional devices and mechanical resonators.

show abstract

Section: Resultsmentioning

confidence: 99%

Massively parallel electro-optic sampling of space-encoded optical pulses for ultrafast multi-dimensional imaging

Kim

Kwak

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…These tap weight errors and the OSSs' shaping errors can be effectively alleviated via feedback control. We also note that, shot noise of the BPD introduces stochastic power fluctuations, which constrains the lowest achievable phase noise floor [65]. Distortions induced by this are similar to those induced by the phase noise of the microcomb and can be reduced by using a BPD with an improved sensitivity [66].…”

Section: Figs 8(a-ⅰⅰ) − (C-ⅰⅰ)mentioning

confidence: 86%

Performance, design, and analysis of microwave photonic spectral domain filters using optical microcombs

Moss¹

2023

Preprint

View full text Add to dashboard Cite

Microwave transversal filters, which are implemented based on the transversal filter structure in digital signal processing, offer a high reconfigurability for achieving a variety of signal processing functions without changing hardware. When implemented using microwave photonic (MWP) technologies, also known as MWP transversal filters, they provide competitive advantages over their electrical counterparts, such as low loss, large operation bandwidth, and strong immunity to electromagnetic interference. Recent advances in high-performance optical microcombs provide compact and powerful multi-wavelength sources for MWP transversal filters that require a larger number of wavelength channels to achieve high performance, allowing for the demonstration of a diverse range of filter functions with improved performance and new features. Here, we present a comprehensive performance analysis for microcomb-based MWP spectral filters based on the transversal filter approach. First, we investigate the theoretical limitations in the filter spectral response induced by finite tap numbers. Next, we analyze the distortions in the filter spectral response resulting from experimental error sources. Finally, we assess the influence of input signal’s bandwidth on the filtering errors. These results provide a valuable guide for the design and optimization of microcomb-based MWP transversal filters for a variety of applications.

show abstract

“…These errors, together with the shaping errors of the OSS, can be effectively mitigated through feedback control, which will be discussed in section Ⅳ. Finally, we note that the BPD shot noise can induce random power fluctuations in the output microwave signal which limits the lowest achievable phase noise floor [49]. The influence of this on the system performance is similar to the microcomb noise, and can be reduced by using a BPD with higher sensitivity [50].…”

Section: Influence Of Optical Spectral Shapers and Photodetectorsmentioning

confidence: 99%

Designing microwave photonic signal processors based on microcombs

Moss¹

2023

Preprint

View full text Add to dashboard Cite

Microwave photonic (MWP) transversal signal processors offer a compelling solution for realizing versatile high-speed information processing by combining the advantages of reconfigurable electrical digital signal processing and high-bandwidth photonic processing. With the capability of generating a number of discrete wavelengths from micro-scale resonators, optical microcombs are powerful multi-wavelength sources for implementing MWP transversal signal processors with significantly reduced size, power consumption, and complexity. By using microcomb-based MWP transversal signal processors, a diverse range of signal processing functions have been demonstrated recently. In this paper we provide a detailed analysis for the errors induced by experimental imperfections processors. First, we investigate the errors arising from different sources including imperfections in the microcombs, the chirp of electro-optic modulators, chromatic dispersion of the dispersive module, shaping errors of the optical spectral shapers, and noise of the photodetector. Next, we provide a global picture quantifying the impact of error sources on the overall system performance. Finally, we introduce feedback control to compensate the errors caused by experimental imperfections, achieving significantly improved accuracy. These results provide a guide for optimizing the accuracy of microcomb-based MWP transversal signal processors.

show abstract

Synchronization of an optical frequency comb and a microwave oscillator with -174 dBc/Hz noise floor

Abstract: We demonstrate optical-microwave timing synchronization by employing electro-optic sampling-based timing detector with residual phase noise (at 8-GHz carrier) of –174.5 dBc/Hz at 100 kHz offset frequency and 88-as integrated timing jitter (over 1-MHz bandwidth).

Cited by 4 publications

References 6 publications

Massively parallel electro-optic sampling of space-encoded optical pulses for ultrafast multi-dimensional imaging

Massively parallel electro-optic sampling of space-encoded optical pulses for ultrafast multi-dimensional imaging

Performance, design, and analysis of microwave photonic spectral domain filters using optical microcombs

Designing microwave photonic signal processors based on microcombs

Contact Info

Product

Resources

About