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Zhe Li; Sezer Erkilinc, M.; Maher, Robert; Galdino, Lidia; Kai Shi; Thomsen, Benn C.; Bayvel, Polina; Killey, Robert I.
IEEE photonics technology letters, 12/2016, Volume: 28, Issue: 24Journal Article
A novel digital two-stage linearization filter is proposed for direct-detection (DD) systems and assessed experimentally for the first time. The performance improvement is quantified by experiments with a 7 × 25 Gb/s wavelength division multiplexing DD single sideband 16-QAM Nyquist-shaped subcarrier modulation system with a net optical information spectral density of 2.3 (b/s)/Hz. The results indicate that this technique can effectively compensate the nonlinearity caused by square-law detection, while, at the same time reducing the DSP complexity, avoiding the need to perform the multiple iterations which are required in previously proposed beating interference cancellation methods.
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