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 counter-propagating 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 / Cecilia Clivati;Gabriele Bolognini;Davide Calonico;Stefano Faralli;Filippo Levi;Alberto Mura;Nicola Poli. - In: IEEE PHOTONICS TECHNOLOGY LETTERS. - ISSN 1041-1135. - STAMPA. - 25:(2013), pp. 1711-1714. [10.1109/LPT.2013.2273269]
Distributed Raman Optical Amplification in Phase Coherent Transfer of Optical Frequencies
POLI, NICOLA
Supervision
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 counter-propagating 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.File | Dimensione | Formato | |
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ClivatiIEEE_PTL2013.pdf
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