scholarly journals Ultra-broadband Kerr microcomb through soliton spectral translation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Gregory Moille ◽  
Edgar F. Perez ◽  
Jordan R. Stone ◽  
Ashutosh Rao ◽  
Xiyuan Lu ◽  
...  
Keyword(s):  
Low Noise ◽  
Optical Frequency ◽  
Wave Mixing ◽  
Bragg Scattering ◽  
Frequency Synthesis ◽  
Beat Note ◽  
Frequency Combs ◽  
Noise Characteristics ◽  
Comb Tooth ◽  
Spectral Translation

AbstractBroadband and low-noise microresonator frequency combs (microcombs) are critical for deployable optical frequency measurements. Here we expand the bandwidth of a microcomb far beyond its anomalous dispersion region on both sides of its spectrum through spectral translation mediated by mixing of a dissipative Kerr soliton and a secondary pump. We introduce the concept of synthetic dispersion to qualitatively capture the system’s key physical behavior, in which the second pump enables spectral translation through four-wave mixing Bragg scattering. Experimentally, we pump a silicon nitride microring at 1063 nm and 1557 nm to enable soliton spectral translation, resulting in a total bandwidth of 1.6 octaves (137–407 THz). We examine the comb’s low-noise characteristics, through heterodyne beat note measurements across its spectrum, measurements of the comb tooth spacing in its primary and spectrally translated portions, and their relative noise. These ultra-broadband microcombs provide new opportunities for optical frequency synthesis, optical atomic clocks, and reaching previously unattainable wavelengths.

scholarly journals Optical frequency combs generated by four-wave mixing in a dual wavelength Brillouin laser cavity

AIP Advances ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 075215 ◽  
Author(s):  
Qing Li ◽  
Zhi-xu Jia ◽  
Zhen-rui Li ◽  
Yue-de Yang ◽  
Jin-long Xiao ◽  
...  
Keyword(s):  
Laser Cavity ◽  
Four Wave Mixing ◽  
Dual Wavelength ◽  
Optical Frequency ◽  
Wave Mixing ◽  
Optical Frequency Combs ◽  
Frequency Combs

Low-noise hybrid frequency synthesizers based on direct digital and direct analog synthesis

2020 ◽  
pp. 51-56
Author(s):  
Vladimir V. Romashov ◽  
Kirill A. Yakimenko ◽  
Andrey N. Doktorov ◽  
Lubov V. Romashova
Keyword(s):  
Phase Noise ◽  
Frequency Synthesizers ◽  
Low Noise ◽  
Synthesis Methods ◽  
Noise Power ◽  
Frequency Synthesis ◽  
Noise Characteristics ◽  
Analog Synthesis ◽  
Hybrid Frequency ◽  
Offset Frequency

The research of the possibility of using hybrid frequency synthesizers based on direct digital and direct analog methods of frequency synthesis as heterodynes of modern spectrum analyzers constructed according to the superheterodyne scheme is presented. The main advantages of such synthesizers over traditionally used heterodyne schemes based on direct digital and indirect frequency synthesis methods are shown. The requirements for the heterodynes of the first mixing stages of spectrum analyzers are presented. A block diagram of a wideband heterodyne generating a frequency range from 4000 MHz to 8000 MHz with a step not exceeding 1 Hz is proposed. Formulas for calculating the main frequency ratios in the structure of the heterodyne have been developed. A mathematical model of phase noise power spectral density (PSD) depending on the offset frequency from the carrier is developed. The noise characteristics of the proposed scheme are studied using the model. It is determined that at the output frequency of the heterodyne equal to 4521,4 MHz, the level of phase noise PSD is: minus 90 dBc/Hz at the offset frequency equal to 100 Hz; minus 140 dBc/Hz at the offset frequency equal to 100 kHz. It is shown that the hybrid synthesizer based on direct digital and direct analog synthesis methods has an advantage in the level of phase noise from 5 to 30 dB over the low-noise heterodynes of modern spectrum analyzers at frequencies above 1 kHz from the carrier. Additional advantages of the proposed scheme are a simple architecture, low power consumption and high frequency tuning speed due to the absence of phaselocked loops in the structure of the heterodyne.

scholarly journals Ultra-low noise all polarization-maintaining Er fiber-based optical frequency combs facilitated with a graphene modulator

2015 ◽  
Vol 23 (19) ◽  
pp. 24342 ◽  
Author(s):  
N. Kuse ◽  
C.-C. Lee ◽  
J. Jiang ◽  
C. Mohr ◽  
T. R. Schibli ◽  
...  
Keyword(s):  
Low Noise ◽  
Optical Frequency ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Polarization Maintaining ◽  
Ultra Low Noise

scholarly journals Low noise all-fiber amplification of a coherent supercontinuum at 2 µm and its limits imposed by polarization noise

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Alexander M. Heidt ◽  
Joanna Modupeh Hodasi ◽  
Anupamaa Rampur ◽  
Dirk-Mathys Spangenberg ◽  
Manuel Ryser ◽  
...  
Keyword(s):  
Modulational Instability ◽  
Low Noise ◽  
Excess Noise ◽  
Fiber System ◽  
Frequency Combs ◽  
Crystal Fiber ◽  
Noise Characteristics ◽  
Fiber Technology ◽  
Pulse Amplifier ◽  
Noise Frequency

Abstract We report a low noise, broadband, ultrafast Thulium/Holmium co-doped all-fiber chirped pulse amplifier, seeded by an Erbium-fiber system spectrally broadened via coherent supercontinuum generation in an all-normal dispersion photonic crystal fiber. The amplifier supports a − 20 dB bandwidth of more than 300 nm and delivers high quality 66 fs pulses with more than 70 kW peak power directly from the output fiber. The total relative intensity noise (RIN) integrated from 10 Hz to 20 MHz is 0.07%, which to our knowledge is the lowest reported RIN for wideband ultrafast amplifiers operating at 2 µm to date. This is achieved by eliminating noise-sensitive anomalous dispersion nonlinear dynamics from the spectral broadening stage. In addition, we identify the origin of the remaining excess RIN as polarization modulational instability (PMI), and propose a route towards complete elimination of this excess noise. Hence, our work paves the way for a next generation of ultra-low noise frequency combs and ultrashort pulse sources in the 2 µm spectral region that rival or even outperform the excellent noise characteristics of Erbium-fiber technology.

scholarly journals Frequency microcomb stabilization via dual-microwave control

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Abhinav Kumar Vinod ◽  
Shu-Wei Huang ◽  
Jinghui Yang ◽  
Mingbin Yu ◽  
Dim-Lee Kwong ◽  
...  
Keyword(s):  
Noise Suppression ◽  
Frequency Comb ◽  
Frequency Instability ◽  
Laser Frequency ◽  
Low Noise ◽  
Optical Frequency ◽  
Great Success ◽  
Frequency Combs ◽  
External Frequency ◽  
Microwave Control

AbstractOptical frequency comb technology has been the cornerstone for scientific breakthroughs in precision metrology. In particular, the unique phase-coherent link between microwave and optical frequencies solves the long-standing puzzle of precision optical frequency synthesis. While the current bulk mode-locked laser frequency comb has had great success in extending the scientific frontier, its use in real-world applications beyond the laboratory setting remains an unsolved challenge due to the relatively large size, weight and power consumption. Recently microresonator-based frequency combs have emerged as a candidate solution with chip-scale implementation and scalability. The wider-system precision control and stabilization approaches for frequency microcombs, however, requires external nonlinear processes and multiple peripherals which constrain their application space. Here we demonstrate an internal phase-stabilized frequency microcomb that does not require nonlinear second-third harmonic generation nor optical external frequency references. We demonstrate that the optical frequency can be stabilized by control of two internally accessible parameters: an intrinsic comb offset ξ and the comb spacing frep. Both parameters are phase-locked to microwave references, with phase noise residuals of 55 and 20 mrad respectively, and the resulting comb-to-comb optical frequency uncertainty is 80 mHz or less. Out-of-loop measurements confirm good coherence and stability across the comb, with measured optical frequency instability of 2 × 10−11 at 20-second gate time. Our measurements are supported by analytical theory including the cavity-induced modulation instability. We further describe an application of our technique in the generation of low noise microwaves and demonstrate noise suppression of the repetition rate below the microwave stabilization limit achieved.

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

2021 ◽  
Vol 11 (16) ◽  
pp. 7650
Author(s):  
Haochen Tian ◽  
Youjian Song ◽  
Minglie Hu
Keyword(s):  
Theoretical Models ◽  
Building Blocks ◽  
Low Noise ◽  
Noise Measurement ◽  
Optical Systems ◽  
Optical Frequency ◽  
Development Mode ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Mode Locked Lasers

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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