It is known that temperature variations and acoustic noise affect ultrastable frequency dissemination along optical fiber. Active stabilization techniques are adopted to compensate for the fiber-induced phase noise. However, despite this compensation, the ultimate link performances are limited by the delay-unsuppressed noise that is related to the propagation delay of the light in the fiber. We demonstrate a post-processing approach which enables us to overcome this limit. We implement a subtraction algorithm between the optical signal delivered at the remote link end and the round-trip signal. In this way, a 6 dB improvement beyond the delay-unsuppressed noise is obtained. We confirm the prediction with experimental data obtained on a 47 km metropolitan fiber link and propose how to extend this method for frequency dissemination.

Doppler-stabilized fiber link with 6 dB noise improvement below the classical limit / Calosso, C.; Bertacco, E.; Calonico, D.; Clivati, C.; Costanzo, G.; Frittelli, M.; Levi, F.; Micalizio, S.; Mura, A.; Godone, A.. - In: OPTICS LETTERS. - ISSN 0146-9592. - 40:2(2015), pp. 131-134.

Doppler-stabilized fiber link with 6 dB noise improvement below the classical limit

C. Calosso;E. Bertacco;D. Calonico;C. Clivati;F. Levi;S. Micalizio;A. Mura;A. Godone
2015

Abstract

It is known that temperature variations and acoustic noise affect ultrastable frequency dissemination along optical fiber. Active stabilization techniques are adopted to compensate for the fiber-induced phase noise. However, despite this compensation, the ultimate link performances are limited by the delay-unsuppressed noise that is related to the propagation delay of the light in the fiber. We demonstrate a post-processing approach which enables us to overcome this limit. We implement a subtraction algorithm between the optical signal delivered at the remote link end and the round-trip signal. In this way, a 6 dB improvement beyond the delay-unsuppressed noise is obtained. We confirm the prediction with experimental data obtained on a 47 km metropolitan fiber link and propose how to extend this method for frequency dissemination.
2015
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/33163
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