M. Chitgarha, S. Khaleghi, M. Ziyadi, W. Daab, A. Mohajerin-Ariaei, D. Rogawski, J. Touch, M. Tur, C. Langrock, M. Fejer, A. Willner
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All-optical phase noise suppression using optical nonlinear mixing combined with tunable optical delays
We propose and demonstrate an all-optical scheme of phase noise reduction using optical nonlinearity and dispersion/conversion delay. This scheme is capable of reducing the standard deviation of phase noise with low frequency component (e.g., laser phase noise) by a factor of ~ 4 without degrading the data signal. The EVM can be reduced from 31% to 11% for ~500 MHz phase noise bandwidth on 20-Gbaud QPSK input.
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