AUTHOR=Yanyan Zhang , Pan Zhang , Mingkun Li , Jiazheng Song , Faxi Chen , Libo Li , Xuelong Li , Yuanshan Liu 

TITLE=All-polarization-maintaining fiber optical frequency comb for the dispersion measurement of a microcavity

JOURNAL=Frontiers in Physics

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.1036218

DOI=10.3389/fphy.2022.1036218

ISSN=2296-424X

ABSTRACT=In this research, we demonstrate an optical frequency comb (OFC) based on a figure-9 laser and polarization-maintaining fibers to measure the dispersion of integrated micro-resonator. We adopt a multi-branch structure to obtain a broad spectral from 1250 nm to 1640 nm with 6 dB bandwidth. The signal mode power at each wavelength of the supercontinuum spectra is greater than 300 nJ, which assuring the signal-to-noise ratio of the beat notes between the OFC and the diode laser. The frequency stability of repetition rate is about 7.5×10-14 in an integration time of 1 s. This system allows us to extend the measurement bandwidth to 60 THz at sub-megahertz resolution, which meets the requirement of the microcavity’s higher order dispersion measurement.