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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Frequency combs and platicons in optical microresonators with normal GVD.

V E Lobanov, G Lihachev, T J Kippenberg

|April 4, 2015

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Researchers predict novel "platicons," or flat-top dissipative solitons, in microresonators with normal group velocity dispersion. These platicons offer tunable durations and can be generated using various pumping methods.

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Area of Science:

Nonlinear optics
Quantum optics
Photonics

Background:

Dissipative solitons are key to understanding nonlinear optical phenomena.
Microresonators support unique light-matter interactions.
Normal group velocity dispersion presents challenges for traditional soliton formation.

Purpose of the Study:

To predict and describe a new class of dissipative solitons, termed "platicons."
To propose methods for generating platicons in microresonator systems.
To investigate the spectral transformation from discrete to quasi-continuous energy states.

Main Methods:

Theoretical prediction of platicon existence in microresonators with normal group velocity dispersion (GVD).
Development of methods for generating platicons from continuous-wave (cw) pump lasers.
Analysis of spectral transformations using the Lugiato-Lefever equation.
Exploration of alternative pumping schemes, including bi-harmonic, phase/amplitude modulated, and injection locking.

Main Results:

Predicted the existence of novel flat-top dissipative solitons ("platicons").
Demonstrated methods for generating platicons from cw pump lasers.
Showed that platicon duration is tunable by adjusting pump frequency.
Observed the transformation of discrete dark soliton spectra into quasi-continuous platicon spectra.

Conclusions:

Platicons represent a new type of dissipative soliton with potential applications in photonics.
Tunable generation of platicons is achievable through various advanced pumping techniques.
The spectral transformation observed provides insights into soliton dynamics in nonlinear systems.