Abstract
A self-evaluation clustering scheme for modulation format identification in coherent optical communication is proposed. The performance of the scheme is tested by numerical simulations on a 28 Gbaud polarization division multiplexing (PDM) system. The results show that the proposed scheme achieves an identification accuracy of 100 % and has a significant tolerance to residual chromatic dispersion for PDM-4QAM, PDM-16QAM, PDM-32QAM, and PDM-64QAM signals when the values of optical signal-to-noise ratio are lower than the corresponding 7 % forward error correction thresholds. Moreover, the 20 Gbaud fiber transmission experiments of PDM-4QAM / 16QAM / 32QAM signals along the 2000 km, 1000 km, and 400 km standard single-mode fiber channel were also performed, respectively. The results show that the proposed scheme is robust towards long-haul fiber transmission.
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