scholarly journals Optical Frequency Combs Generated in Silica Microspheres in the Telecommunication C-, U-, and E-Bands

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 345
Author(s):  
Elena A. Anashkina ◽  
Maria P. Marisova ◽  
Toms Salgals ◽  
Janis Alnis ◽  
Ilya Lyashuk ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Frequency ◽  
Silica Microspheres ◽  
Pump Frequency ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Wavelength Division ◽  
Whispering Gallery ◽  
Simulation Based ◽  
Spectral Ranges

Optical frequency combs (OFCs) generated in microresonators with whispering gallery modes are demanded for different applications including telecommunications. Extending operating spectral ranges is an important problem for wavelength-division multiplexing systems based on microresonators. We demonstrate experimentally three spectrally separated OFCs in the C-, U-, and E-bands in silica microspheres which, in principle, can be used for telecommunication applications. For qualitative explanation of the OFC generation in the sidebands, we calculated gain coefficients and gain bandwidths for degenerate four-wave mixing (FWM) processes. We also attained a regime when the pump frequency was in the normal dispersion range and only two OFCs were generated. The first OFC was near the pump frequency and the second Raman-assisted OFC with a soliton-like spectrum was in the U-band. Numerical simulation based on the Lugiato–Lefever equation was performed to support this result and demonstrate that the Raman-assisted OFC may be a soliton.

scholarly journals Optical Frequency Combs in Quadratically Nonlinear Resonators

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 230 ◽  
Author(s):  
Iolanda Ricciardi ◽  
Simona Mosca ◽  
Maria Parisi ◽  
François Leo ◽  
Tobias Hansson ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Frequency Comb ◽  
Second Harmonic ◽  
Theoretical Work ◽  
Optical Frequency ◽  
Pump Frequency ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
New Class ◽  
Parametric Processes

Optical frequency combs are one of the most remarkable inventions in recent decades. Originally conceived as the spectral counterpart of the train of short pulses emitted by mode-locked lasers, frequency combs have also been subsequently generated in continuously pumped microresonators, through third-order parametric processes. Quite recently, direct generation of optical frequency combs has been demonstrated in continuous-wave laser-pumped optical resonators with a second-order nonlinear medium inside. Here, we present a concise introduction to such quadratic combs and the physical mechanism that underlies their formation. We mainly review our recent experimental and theoretical work on formation and dynamics of quadratic frequency combs. We experimentally demonstrated comb generation in two configurations: a cavity for second harmonic generation, where combs are generated both around the pump frequency and its second harmonic and a degenerate optical parametric oscillator, where combs are generated around the pump frequency and its subharmonic. The experiments have been supported by a thorough theoretical analysis, aimed at modelling the dynamics of quadratic combs, both in frequency and time domains, providing useful insights into the physics of this new class of optical frequency comb synthesizers. Quadratic combs establish a new class of efficient frequency comb synthesizers, with unique features, which could enable straightforward access to new spectral regions and stimulate novel applications.

Kerr Optical Frequency Combs With Multi-FSR Mode Spacing in Silica Microspheres

2021 ◽  
Vol 33 (9) ◽  
pp. 453-456
Author(s):  
Elena A. Anashkina ◽  
Vjaceslavs Bobrovs ◽  
Toms Salgals ◽  
Inga Brice ◽  
Janis Alnis ◽  
...  
Keyword(s):  
Optical Frequency ◽  
Mode Spacing ◽  
Silica Microspheres ◽  
Optical Frequency Combs ◽  
Frequency Combs

scholarly journals Chip-based optical frequency combs for high-capacity optical communications

Nanophotonics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 1367-1385
Author(s):  
Hao Hu ◽  
Leif K. Oxenløwe
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Communications ◽  
Communication Systems ◽  
Energy Savings ◽  
Frequency Comb ◽  
High Capacity ◽  
Optical Frequency ◽  
Optical Carrier ◽  
Optical Frequency Combs ◽  
Frequency Combs

Abstract Current fibre optic communication systems owe their high-capacity abilities to the wavelength-division multiplexing (WDM) technique, which combines data channels running on different wavelengths, and most often requires many individual lasers. Optical frequency combs, with equally spaced coherent comb lines derived from a single source, have recently emerged as a potential substitute for parallel lasers in WDM systems. Benefits include the stable spacing and broadband phase coherence of the comb lines, enabling improved spectral efficiency of transmission systems, as well as potential energy savings in the WDM transmitters. In this paper, we discuss the requirements to a frequency comb for use in a high-capacity optical communication system in terms of optical linewidth, per comb line power and optical carrier-to-noise ratio, and look at the scaling of a comb source for ultra-high capacity systems. Then, we review the latest advances of various chip-based optical frequency comb generation schemes and their applications in optical communications, including mode-locked laser combs, spectral broadening of frequency combs, microresonator-based Kerr frequency combs and electro-optic frequency combs.

Multi-microwave sources generation based on dual optical frequency combs

2015 ◽  
Author(s):  
Wenhui Sun ◽  
Jianguo Liu ◽  
Wenting Wang ◽  
Weiyu Wang ◽  
Haiqing Yuan ◽  
...  
Keyword(s):  
Optical Frequency ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Microwave Sources

Multiheterodyne detection for self-referenced characterization of complex arbitrary waveforms from largely detuned optical frequency combs

2012 ◽  
Author(s):  
Anthony C. Klee ◽  
Josue Davila-Rodriguez ◽  
Marcus Bagnell ◽  
Peter J. Delfyett
Keyword(s):  
Optical Frequency ◽  
Optical Frequency Combs ◽  
Frequency Combs

Phase Measurements and Phase-Locking in Microresonator-Based Optical Frequency Combs

CLEO: 2014 ◽  
2014 ◽  
Author(s):  
Pascal Del’Haye ◽  
William Loh ◽  
Katja Beha ◽  
Scott B. Papp ◽  
Scott A. Diddams
Keyword(s):  
Phase Locking ◽  
Optical Frequency ◽  
Phase Measurements ◽  
Optical Frequency Combs ◽  
Frequency Combs

Dynamics of Optical Frequency Combs in Ring and Fabry-Perot Quantum Cascade Lasers

2021 ◽  
Author(s):  
Carlo Silvestri ◽  
Lorenzo Luigi Columbo ◽  
Massimo Brambilla ◽  
Mariangela Gioannini
Keyword(s):  
Quantum Cascade Lasers ◽  
Optical Frequency ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Quantum Cascade ◽  
Fabry Perot ◽  
Cascade Lasers
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