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Updated: Jan 17, 2026

Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
Demonstration of Alamouti coded 200-Gb/s/λ coherent PON downstream enabled by polar coded truncated probabilistic
Abstract:
In this paper, a simplified coherent passive optical network (PON) downstream employing polar coded many-to-one (MTO) mapping based truncated probabilistic shaped 64-ary quadrature amplitude modulation (PTPS-64QAM) is investigated with a line rate of 200-Gb/s/λ, where the PTPS-64QAM is coded by an Alamouti encoder to avoid the impacts of polarization fluctuations. Experimental results under optical-back-to-back (OBTB) cases show that a 32-dB power budget (class C+) could be obtained by employing PTPS-64QAM, which outperforms uniformly distributed 32-ary quadrature amplitude modulation (UD-32QAM) and uniformly distributed 64-ary quadrature amplitude modulation (UD-64QAM) by 3-dB and 5-dB, respectively. For the 20-km transmissions cases, the PTPS-64QAM achieves a 29-dB power budget with the optimal launch power of 10-dBm, whose power budget shows 2-dB and 5-dB improvements with respect to UD-32QAM and UD-64QAM, respectively. The results demonstrated in this paper suggest that PTPS-64QAM might be a powerful candidate for very high-speed PONs in the future.
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