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

Yuanxiang Chen,Yongtao Huang,Jia Fu,Ying Han,Jianguo Yu,Yitong Li,Kaile Li

doi:10.1109/jphot.2020.2984690

Yuanxiang Chen, Yongtao Huang + Show 5 more

Open Access

https://doi.org/10.1109/jphot.2020.2984690

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Abstract

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.

Highlights

Due to its high flexibility, high spectrum efficiency and robustness against chromatic dispersion (CD) and polarization mode dispersion (PMD), coherent optical orthogonal frequency division multiplexing (CO-OFDM) has attracted great interest in the field of optical communication [1]–[4]
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
The results show that the proposed Gaussian wavelet basis expansion (GWBE) scheme is obviously superior to common phase error (CPE) and orthogonal basis expansion (OBE) in different nonlinear phase noise scenarios

Summary

Introduction

Due to its high flexibility, high spectrum efficiency and robustness against chromatic dispersion (CD) and polarization mode dispersion (PMD), coherent optical orthogonal frequency division multiplexing (CO-OFDM) has attracted great interest in the field of optical communication [1]–[4]. The sensitivity to phase noise has always been considered as a major drawback of CO-OFDM [5]–[7] To address this problem, narrow linewidth lasers with linewidth of hundreds of kHz or less are always required at the CO-OFDM transmitter and receiver, which will increase the system cost. By periodically inserting pilot subcarriers to OFDM symbols, pilot aided (PA) phase noise estimation method can effectively compensate the CPE [8], [9]. Blind phase noise estimation by utilizing a set of test phases can effectively suppress ICI [13]. Phase noise suppression methods based on orthogonal basis expansion (OBE) and eigenvector basis expansion (EBE) were proposed by Dr Yang in [14]–[17]. To get the eigenvector, back to back (BTB) pre-training is needed in the EBE scheme and it is inconvenient for practical application

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