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In this paper, we propose a novel Gaussian wavelet basis expansion-based phase noise suppression scheme for polarization-division-multiplexing (PDM) coherent optical orthogonal frequency division multiplexing (CO-OFDM) superchannel. We analyze the phase noise suppression principle of Gaussian wavelet basis expansion (GWBE) and experimentally demonstrated it in 400-Gb/s optical PDM-QPSK-OFDM superchannel. Compared with the traditional common phase error (CPE) suppression scheme, a Q-factor improvement of about 1.5~3.2 dB is achieved when the number of the pilots ranges from 16 to 80. Meanwhile, we evaluate the nonlinear phase noise suppression ability by adjusting the launched power into 160 km standard single mode fiber (SSMF). The results show that the proposed GWBE scheme is obviously superior to CPE and orthogonal basis expansion (OBE) in different nonlinear phase noise scenarios. Furtherly, we extend the GWBE scheme to 800 Gb/s PDM-16QAM-OFDM superchannel. The GWBE scheme can enhance the BER performance from 1.92 E-03 to 5.87 E-04 when the number of pilots is 48.

A Novel Phase Noise Suppression Scheme Utilizing Gaussian Wavelet Basis Expansion for PDM CO-OFDM Superchannel