Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 33, Issue 9, Pages 453-456Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2021.3068373
Keywords
Silicon compounds; Optical fiber dispersion; Telecommunications; Optical fiber amplifiers; Laser stability; Steady-state; Pump lasers; Microsphere; whispering gallery mode (WGM); free spectral range (FSR); optical frequency comb (OFC)
Funding
- Center of Excellence Center of Photonics - Ministry of Science and Higher Education of the Russian Federation [075-152020-906]
- European Regional Development Fund The Development of Quantum Optics and Photonics in University of Latvia [1.1.1.5/19/A/003]
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Experimental demonstration of Kerr optical frequency combs (OFCs) with mode spacings of different multiples of free spectral range (FSR) in silica microspheres pumped by CW C-band lasers. The experimental realization is based on standard telecom equipment and components, with numerical simulation supporting the results and explaining spectral asymmetry in OFCs due to 3rd-order dispersion influence.
We experimentally demonstrate Kerr optical frequency combs (OFCs) with mode spacing of 1, 2, 3, 5, 6, and 8 free spectral ranges (FSRs) corresponding to 0.4, 0.8, 1.2, 2, 2.4, and 3.2 THz, respectively, in silica microspheres pumped by CW C-band lasers in the anomalous dispersion range. Experimental realizations are based on using standard telecom equipment and components such as SMF-28e fiber for producing microspheres and fiber tapers for pump coupling and OFC outcoupling. Numerical simulation is performed to support the experimental results and explain the observed spectral asymmetry in OFCs by the influence of the 3rd-order dispersion.
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