We describe the application of Raman optical-fiber amplification (ROA) for the phase coherent transfer of optical frequencies in an optical fiber link. ROA uses the transmission fiber itself as a gain medium for bi-directional coherent amplification. In a test setup, we evaluated the ROA in terms of ON/OFF gain, signal-to-noise ratio, and phase noise added to the carrier. We transferred a laser frequency in a 200 km optical fiber link, and evaluated both co-propagating and counterpropagating amplification pump schemes. Then, we identified the occurrence of nonlinearities on the signal for non-optimized ROA gain. The frequency at the remote end has a fractional frequency instability of 3 · 10−19 over 1000 s with the optical fiber link noise compensation.

Distributed Raman Optical Amplification in Phase Coherent Transfer of Optical Frequencies / Clivati, Cecilia; Bolognini, G.; Calonico, Davide; Faralli, S.; Levi, Filippo; Mura, Alberto; Poli, N.. - In: IEEE PHOTONICS TECHNOLOGY LETTERS. - ISSN 1041-1135. - 25:17(2013), pp. 1711-1714. [10.1109/LPT.2013.2273269]

Distributed Raman Optical Amplification in Phase Coherent Transfer of Optical Frequencies

CLIVATI, CECILIA;CALONICO, DAVIDE;LEVI, FILIPPO;MURA, ALBERTO;
2013

Abstract

We describe the application of Raman optical-fiber amplification (ROA) for the phase coherent transfer of optical frequencies in an optical fiber link. ROA uses the transmission fiber itself as a gain medium for bi-directional coherent amplification. In a test setup, we evaluated the ROA in terms of ON/OFF gain, signal-to-noise ratio, and phase noise added to the carrier. We transferred a laser frequency in a 200 km optical fiber link, and evaluated both co-propagating and counterpropagating amplification pump schemes. Then, we identified the occurrence of nonlinearities on the signal for non-optimized ROA gain. The frequency at the remote end has a fractional frequency instability of 3 · 10−19 over 1000 s with the optical fiber link noise compensation.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/31260
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