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

IEEE Photonics Technology Letters 2021
Elena Anshkina, Vjačeslavs Bobrovs, Toms Salgals, Inga Brice, Jānis Alnis, Alexey Andrianov

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.

Keywords
Microsphere, whispering gallery mode (WGM), free spectral range (FSR), optical frequency comb (OFC)
DOI
10.1109/LPT.2021.3068373
Hyperlink
https://ieeexplore.ieee.org/document/9385100

Anshkina, E., Bobrovs, V., Salgals, T., Brice, I., Alnis, J., Andrianov, A. Kerr Optical Frequency Combs with Multi-FSR Mode Spacing in Silica Microspheres. IEEE Photonics Technology Letters, 2021, Vol. 33, No. 9, pp.453-456. ISSN 1041-1135. e-ISSN 1941-0174. Available from: doi:10.1109/LPT.2021.3068373

Publication language
English (en)