scholarly journals Spectral extension and synchronization of microcombs in a single microresonator

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Shuangyou Zhang ◽  
Jonathan M. Silver ◽  
Toby Bi ◽  
Pascal Del’Haye
Keyword(s):  
Repetition Rate ◽  
Optical Pulse ◽  
Frequency Comb ◽  
Optical Power ◽  
Normal Dispersion ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Dispersion Regime ◽  
Telecom Networks ◽  
Selective Enhancement

AbstractBroadband optical frequency combs are extremely versatile tools for precision spectroscopy, ultrafast ranging, as channel generators for telecom networks, and for many other metrology applications. Here, we demonstrate that the optical spectrum of a soliton microcomb generated in a microresonator can be extended by bichromatic pumping: one laser with a wavelength in the anomalous dispersion regime of the microresonator generates a bright soliton microcomb while another laser in the normal dispersion regime both compensates the thermal effect of the microresonator and generates a repetition-rate-synchronized second frequency comb. Numerical simulations agree well with experimental results and reveal that a bright optical pulse from the second pump is passively formed in the normal dispersion regime and trapped by the primary soliton. In addition, we demonstrate that a dispersive wave can be generated and influenced by cross-phase-modulation-mediated repetition-rate synchronization of the two combs. The demonstrated technique provides an alternative way to generate broadband microcombs and enables the selective enhancement of optical power in specific parts of a comb spectrum.

scholarly journals Normal-dispersion microresonator Kerr frequency combs

Nanophotonics ◽  
2016 ◽  
Vol 5 (2) ◽  
pp. 244-262 ◽  
Author(s):  
Xiaoxiao Xue ◽  
Minghao Qi ◽  
Andrew M. Weiner
Keyword(s):  
Velocity Dispersion ◽  
Frequency Comb ◽  
Group Velocity Dispersion ◽  
Research Area ◽  
Future Directions ◽  
Normal Dispersion ◽  
Frequency Combs ◽  
The Past ◽  
Dispersion Regime ◽  
Comb Generation

AbstractOptical microresonator-based Kerr frequency comb generation has developed into a hot research area in the past decade. Microresonator combs are promising for portable applications due to their potential for chip-level integration and low power consumption. According to the group velocity dispersion of the microresonator employed, research in this field may be classified into two categories: the anomalous dispersion regime and the normal dispersion regime. In this paper, we discuss the physics of Kerr comb generation in the normal dispersion regime and review recent experimental advances. The potential advantages and future directions of normal dispersion combs are also discussed.

scholarly journals Design of Broadband Flat Optical Frequency Comb Based on Cascaded Sign-Alternated Dispersion Tellurite Microstructure Fiber

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1252
Author(s):  
Guocheng Huang ◽  
Meicheng Fu ◽  
Junli Qi ◽  
Jinghan Pan ◽  
Wenjun Yi ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Frequency Comb ◽  
Input Pulse ◽  
Optical Signal ◽  
Optical Frequency Comb ◽  
Optical Frequency ◽  
Spectral Bandwidth ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Microstructure Fiber

We designed a tellurite microstructure fiber (TMF) and proposed a broadband optical frequency comb generation scheme that was based on electro-optical modulation and cascaded sign-alternated dispersion TMF (CSAD-TMF). In addition, the influence of different nonlinear effects, the ultrashort pulse evolution in the CSAD-TMF with the anomalous dispersion (AD) zones and the normal dispersion (ND) zones were analyzed based on the generalized nonlinear Schrodinger equations (GNLSE) modelling. According to the simulations, when the input seed comb had a repetition rate of 20 GHz and had an input pulse peak power of 30 W, the generation scheme could generate optical frequency combs with a 6 dB spectral bandwidth spanning over 170 nm centered at 1550 nm. Furthermore, the generated combs showed good coherence in performance over the whole 6 dB spectral bandwidth. The highly coherent optical frequency combs can be used as high-repetition-rate, multi-wavelength light sources for various integrated microwave photonics and ultrafast optical signal processing applications.

scholarly journals COMPRESSION OF BRIGHT OPTICAL PULSE BY PULSE PAIR IN THE NORMAL DISPERSION REGIME OF SINGLE MODE FIBERS

1997 ◽  
Vol 46 (5) ◽  
pp. 919
Author(s):  
CAO WEN-HUA ◽  
ZHANG YOU-WEI ◽  
LIU SONG-HAO ◽  
GUO QI ◽  
XU WEN-CHENG
Keyword(s):  
Optical Pulse ◽  
Single Mode ◽  
Normal Dispersion ◽  
Pulse Pair ◽  
Dispersion Regime

Precision Mid-Infrared Frequency Comb Spectroscopy using a Cross-Dispersed Spectrometer

2021 ◽  
Author(s):  
D. Michelle Bailey ◽  
Gang Zhao ◽  
Adam J. Fleisher
Keyword(s):  
Frequency Comb ◽  
Difference Frequency Generation ◽  
Laser Frequency ◽  
Trace Gas ◽  
Molecular Fingerprint ◽  
Mid Infrared ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Infrared Spectral ◽  
Fingerprint Region

<p>Advances in optical technology have led to the commercialization and widespread use of broadband optical frequency combs for multiplexed measurements of trace-gas species. Increasingly available in the mid-infrared spectral region, these devices can be leveraged to interrogate the molecular fingerprint region where many fundamental rovibrational transitions occur. Here we present a cross-dispersed spectrometer employing a virtually imaged phased array etalon and ruled diffraction grating coupled with a difference frequency generation comb centered near 4.5 µm. The spectrometer achieves sub-GHz spectral resolution with a 30 cm<sup>-1</sup> instantaneous bandwidth. Laboratory results for nitrous oxide isotopic abundance retrieval will be presented. Challenges relating to characterizing the instrument lineshape function, constructing a frequency axis traceable to the comb, and accurate spectral modelling will be addressed and progress towards incorporating a more compact laser frequency comb source into the system will be discussed.</p>

scholarly journals High Fundamental Repetition Rate Fiber Lasers Operated in Strong Normal Dispersion Regime

2009 ◽  
Vol 21 (11) ◽  
pp. 724-726 ◽  
Author(s):  
L.M. Zhao ◽  
C. Lu ◽  
H.Y. Tam ◽  
P.K.A. Wai ◽  
D.Y. Tang
Keyword(s):  
Repetition Rate ◽  
Fiber Lasers ◽  
Normal Dispersion ◽  
Dispersion Regime

Development of a Non-Contact Precision Measurement Technique Using Optical Frequency Combs

2012 ◽  
Vol 523-524 ◽  
pp. 877-882 ◽  
Author(s):  
Taro Onoe ◽  
Satoru Takahashi ◽  
Kiyoshi Takamasu ◽  
Hirokazu Matsumoto
Keyword(s):  
High Resolution ◽  
Frequency Comb ◽  
High Sensitivity ◽  
Distance Measurement ◽  
New Method ◽  
Optical Frequency ◽  
Optical Frequency Combs ◽  
High Frequencies ◽  
Frequency Combs ◽  
Lock In

We develop a new method for high-resolution and contactless distance measurement based on self frequency beats of optical frequency combs. We use two optical frequency comb lasers with Rb-stabilized repetition frequencies for doing accurate distance measurement. The repetition frequencies of the optical frequency combs are different, thus parts of the high frequencies such as several gigahertz of self beats are beat-downed to several megahertz without an RF frequency oscillator. The phases of the beat signals of several megahertz frequencies are measured by a lock-in amplifier with a high resolution and high sensitivity. The new method is applied to distance measurement for objects which have rough-surface in the distance range of several-meters.

Optical frequency combs: Coherently uniting the electromagnetic spectrum

Science ◽  
2020 ◽  
Vol 369 (6501) ◽  
pp. eaay3676
Author(s):  
Scott A. Diddams ◽  
Kerry Vahala ◽  
Thomas Udem
Keyword(s):  
Radio Frequency ◽  
Frequency Comb ◽  
Electromagnetic Spectrum ◽  
Optical Frequency ◽  
Frequency Signal ◽  
Optical Frequency Combs ◽  
Laser Technology ◽  
Vast Array ◽  
Radio Frequency Signal ◽  
Frequency Combs

Optical frequency combs were introduced around 20 years ago as a laser technology that could synthesize and count the ultrafast rate of the oscillating cycles of light. Functioning in a manner analogous to a clockwork of gears, the frequency comb phase-coherently upconverts a radio frequency signal by a factor of ≈105 to provide a vast array of evenly spaced optical frequencies, which is the comb for which the device is named. It also divides an optical frequency down to a radio frequency, or translates its phase to any other optical frequency across hundreds of terahertz of bandwidth. We review the historical backdrop against which this powerful tool for coherently uniting the electromagnetic spectrum developed. Advances in frequency comb functionality, physical implementation, and application are also described.

scholarly journals Optical Frequency Comb Generation based on Erbium Fiber Lasers

Nanophotonics ◽  
2016 ◽  
Vol 5 (2) ◽  
pp. 196-213 ◽  
Author(s):  
Stefan Droste ◽  
Gabriel Ycas ◽  
Brian R. Washburn ◽  
Ian Coddington ◽  
Nathan R. Newbury
Keyword(s):  
Frequency Comb ◽  
Building Blocks ◽  
Laser Frequency ◽  
Optical Frequency ◽  
Laser Amplifier ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Comb Generation ◽  
Optical Frequency Metrology ◽  
Frequency Metrology

AbstractOptical frequency combs have revolutionized optical frequency metrology and are being actively investigated in a number of applications outside of pure optical frequency metrology. For reasons of cost, robustness, performance, and flexibility, the erbium fiber laser frequency comb has emerged as the most commonly used frequency comb system and many different designs of erbium fiber frequency combs have been demonstrated. We review the different approaches taken in the design of erbium fiber frequency combs, including the major building blocks of the underlying mode-locked laser, amplifier, supercontinuum generation and actuators for stabilization of the frequency comb.

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