Frequency dissemination over optical fiber links relies on measuring the phase of fiber-delivered lasers. Phase is extracted from optical beatnotes and the detection fails in case of beatnotes fading due to polarization changes, which strongly limit the reliability and robustness of the dissemination chain. We propose a new method that overcomes this issue, based on a dual-polarization coherent receiver and a dedicated signal processing that we developed on a field programmable gated array. Our method allowed analysis of polarization-induced phase noise from a theoretical and experimental point of view and endless tracking of the optical phase. This removes a major obstacle in the use of optical links for those physics experiments where long measurement times and high reliability are required.

Robust optical frequency dissemination with a dual-polarization coherent receiver / Clivati, Cecilia; Savio, Paolo; Abrate, Silvio; Curri, Vittorio; Gaudino, Roberto; Pizzocaro, Marco; Calonico, Davide. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 28:6(2020), p. 8494-8511. [10.1364/OE.378602]

Robust optical frequency dissemination with a dual-polarization coherent receiver

Clivati, Cecilia;Pizzocaro, Marco;Calonico, Davide
2020

Abstract

Frequency dissemination over optical fiber links relies on measuring the phase of fiber-delivered lasers. Phase is extracted from optical beatnotes and the detection fails in case of beatnotes fading due to polarization changes, which strongly limit the reliability and robustness of the dissemination chain. We propose a new method that overcomes this issue, based on a dual-polarization coherent receiver and a dedicated signal processing that we developed on a field programmable gated array. Our method allowed analysis of polarization-induced phase noise from a theoretical and experimental point of view and endless tracking of the optical phase. This removes a major obstacle in the use of optical links for those physics experiments where long measurement times and high reliability are required.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/62005
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