Journal
NATURE PHOTONICS
Volume 11, Issue 9, Pages 560-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2017.117
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Funding
- Defense Advanced Research Projects Agency under the PULSE programme [W31P4Q-14-1-0001]
- Defense Advanced Research Projects Agency under the SCOUT programme [W911NF-16-1-0548]
- NASA
- Kavli Nanoscience Institute
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Solitons occur in many physical systems when a nonlinearity compensates wave dispersion. Their recently demonstrated formation in microresonators has opened a new research direction for nonlinear optical physics(1-5). Soliton mode locking also endows frequency microcombs with the enhanced stability necessary for miniaturization of spectroscopy and frequency metrology systems(6). These microresonator solitons orbit around a closed waveguide path and produce a repetitive output pulse stream at a rate set by the roundtrip time. Here, counter-propagating solitons that simultaneously orbit in an opposing sense (clockwise/counter-clockwise) are studied. Despite sharing the same spatial mode family, their roundtrip times can be precisely and independently controlled. Furthermore, a state is possible in which both the relative optical phase and relative repetition rates of the distinct soliton streams are locked. This state allows a single resonator to produce dual-soliton frequency-comb streams with different repetition rates, but with a high relative coherence that is useful in both spectroscopy(7-9) and laser ranging systems(10).
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