scholarly journals Frequency division using a soliton-injected semiconductor gain-switched frequency comb

2020 ◽  
Vol 6 (39) ◽  
pp. eaba2807 ◽  
Author(s):  
Wenle Weng ◽  
Aleksandra Kaszubowska-Anandarajah ◽  
Junqiu Liu ◽  
Prince M. Anandarajah ◽  
Tobias J. Kippenberg
Keyword(s):  
Frequency Comb ◽  
Low Noise ◽  
Optical Frequency ◽  
Frequency Division ◽  
Fully Integrated ◽  
Microwave Generation ◽  
Frequency Combs ◽  
Line Spacing ◽  
Sinusoidal Current ◽  
Semiconductor Gain

With optical spectral marks equally spaced by a frequency in the microwave or the radio frequency domain, optical frequency combs have been used not only to synthesize optical frequencies from microwave references but also to generate ultralow-noise microwaves via optical frequency division. Here, we combine two compact frequency combs, namely, a soliton microcomb and a semiconductor gain-switched comb, to demonstrate low-noise microwave generation based on a novel frequency division technique. Using a semiconductor laser that is driven by a sinusoidal current and injection-locked to microresonator solitons, our scheme transfers the spectral purity of a dissipative soliton oscillator into the subharmonic frequencies of the microcomb repetition rate. In addition, the gain-switched comb provides dense optical spectral emissions that divide the line spacing of the soliton microcomb. With the potential to be fully integrated, the merger of the two chipscale devices may profoundly facilitate the wide application of frequency comb 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 Direct Kerr frequency comb atomic spectroscopy and stabilization

2020 ◽  
Vol 6 (9) ◽  
pp. eaax6230 ◽  
Author(s):  
Liron Stern ◽  
Jordan R. Stone ◽  
Songbai Kang ◽  
Daniel C. Cole ◽  
Myoung-Gyun Suh ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Frequency Comb ◽  
Frequency Control ◽  
Low Noise ◽  
Atomic Spectroscopy ◽  
Atomic Transition ◽  
Laser Source ◽  
Optical Frequency ◽  
Dimensional Metrology ◽  
Frequency Combs

Microresonator-based soliton frequency combs, microcombs, have recently emerged to offer low-noise, photonic-chip sources for applications, spanning from timekeeping to optical-frequency synthesis and ranging. Broad optical bandwidth, brightness, coherence, and frequency stability have made frequency combs important to directly probe atoms and molecules, especially in trace gas detection, multiphoton light-atom interactions, and spectroscopy in the extreme ultraviolet. Here, we explore direct microcomb atomic spectroscopy, using a cascaded, two-photon 1529-nm atomic transition in a rubidium micromachined cell. Fine and simultaneous repetition rate and carrier-envelope offset frequency control of the soliton enables direct sub-Doppler and hyperfine spectroscopy. Moreover, the entire set of microcomb modes are stabilized to this atomic transition, yielding absolute optical-frequency fluctuations at the kilohertz level over a few seconds and <1-MHz day-to-day accuracy. Our work demonstrates direct atomic spectroscopy with Kerr microcombs and provides an atomic-stabilized microcomb laser source, operating across the telecom band for sensing, dimensional metrology, and communication.

scholarly journals Spectral Broadening in a Continuously Pumped Singly Resonant Second-Harmonic Cavity

2021 ◽  
Vol 11 (15) ◽  
pp. 7122
Author(s):  
Simona Mosca ◽  
Tobias Hansson ◽  
Maria Parisi
Keyword(s):  
Continuous Wave ◽  
Frequency Comb ◽  
Second Harmonic ◽  
Input Power ◽  
Second Order ◽  
Optical Frequency ◽  
Frequency Combs ◽  
Research Areas ◽  
Mixed Regime ◽  
Wide Range

Optical frequency comb synthesizers with a wide spectral range are an essential tool for many research areas such as spectroscopy, precision metrology, optical communication, and sensing. Recent studies have demonstrated the direct generation of frequency combs, via second-order processes, that are centered on two different spectral regions separated by an octave. Here, we present the capability of optical quadratic frequency combs for broad-bandwidth spectral emission in unexplored regimes. We consider comb formation under phase-matched conditions in a continuous-wave pumped singly resonant second-harmonic cavity, with large intracavity power and control of the detuning over several cavity line widths. The spectral analysis reveals quite distinctive sidebands that arise far away from the pump, singularly or in a mixed regime together with narrowband frequency combs. Notably, by increasing the input power, the optical frequency lines evolve into widely spaced frequency clusters, and at maximum power, they appear in a wavelength range spanning up to 100 nm. The obtained results demonstrate the power of second-order nonlinearities for direct comb production within a wide range of pump wavelengths.

Low-noise and broadband optical frequency comb generation based on an optoelectronic oscillator

2014 ◽  
Vol 39 (4) ◽  
pp. 785 ◽  
Author(s):  
Xiaopeng Xie ◽  
Tao Sun ◽  
Huanfa Peng ◽  
Cheng Zhang ◽  
Peng Guo ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Low Noise ◽  
Optical Frequency Comb ◽  
Optical Frequency ◽  
Optoelectronic Oscillator ◽  
Comb Generation
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