Abstract
In recent years, the dissemination of optical frequency signals along phase-stabilized fibers has allowed the comparison of optical clocks at unprecedented levels of accuracy. This has a strong relevance in frequency metrology and boosted the measurement capabilities also in other research fields such as radioastronomy [1], geodesy [2] and fundamental physics [3]. Fiber-based frequency dissemination relies on the transmission of a continuous-wave, narrow-linewidth laser whose frequency is accurately measured with an atomic clock at the National Metrology Institute (NMI) where it is generated. Specific techniques are used to compensate for the acoustic and seismic noise and temperature variations, which degrade the phase stability of the transmitted signal. However, in existing implementations, it is not possible to detect and compensate for the birefringence variations of the optical fiber. These can induce variations in the state of polarization (SOP) of the transmitted signal, affecting the optical beatnotes at the receiving end. This not only degrades the achievable performances in terms of phase stability of the metrological signal, but can also lead to beatnote fading, with consequent failure of the entire system. This problem currently represents one of the strongest limitations to the reliability of fiber-based frequency dissemination.
© 2019 IEEE
PDF ArticleMore Like This
A. M. YUREK, A. D. KERSEY, A. DANDRIDGE, and JOSEPH F. WELLER
TuI4 Optical Fiber Communication Conference (OFC) 1988
Cecilia Clivati, Roberto Aiello, Giuseppe Bianco, Claudio Bortolotti, Valentina Di Sarno, Pasquale Maddaloni, Filippo Levi, Giuseppe Maccaferri, Alberto Mura, Monia Negusini, Federico Perini, Mauro Roma, Roberto Ricci, Luigi Santamaria Amato, Mario Siciliani De Cumis, Matteo Stagni, and Davide Calonico
SM2N.4 CLEO: Science and Innovations (CLEO:S&I) 2020
Rui Wu, Fei Yang, Zitong Feng, Zhidan Ding, and Haiwen Cai
S3B.2 Asia Communications and Photonics Conference (ACP) 2019