Abstract
Multi-carrier optical communication schemes are attractive for high-speed mobile fronthaul networks, edge cloud computing and passive optical networks. Compared with conventional orthogonal frequency-division multiplexing (OFDM), universal filter multi-carrier (UFMC) can shape the spectrum of the transmitted signal by introducing universal filter banks. Meanwhile, probabilistic shaping (PS) can make full use of achieved signal-to-noise ratio (SNR) to adaptively adjust the entropy loading according to the measured SNR of each subchannel. However, the significant amount of required distribution matcher (DM) is challenging in the practical implementation. In this work, we experimentally demonstrated 12.5-GBd and 25-GBd PS-UFMC transmissions with approximate 10-GHz bandwidth-limited system over 30-km standard single mode fiber. Due to the sharp cutoff frequency-response of filters, the effect of the frequency decaying in the 25-GBd OFDM system has been eliminated in the UFMC system. Consequently, each subband has similar SNR and therefore the number of required DMs is reduced. Moreover, considering the receiver complexity constraints, the improved bit error ratio performance was achieved by optimizing the allocation of data subbands to mitigate inter symbol interference caused by the dispersion of transmitted fiber.
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