Constellation-designed 32QAM with geometric and probabilistic shaping for optical fiber system

Abstract. A constellation-designed 32QAM method is proposed using geometric shaping (GS) and probabilistic shaping (PS). In addition, a 50-Gbaud polarization division multiplexed multispan optical fiber link for the proposed scheme is set up. The simulation results show that when the net data rate reaches 211 Gbit/s, the proposed 32QAM with GS and PS is capable of achieving about 0.1- and 0.3-dB OSNR gain over PS-32QAM and regular 32QAM (R-32QAM), respectively. When 213 Gbit/s net data rate transmission is achieved, the use of the proposed 32QAM can increase the transmission length by ∼60  km over PS-32QAM and ∼210  km over R-32QAM. Moreover, when OSNR is set to 19 dB and signal bandwidth is 40 Gbaud, the net data rate of the proposed 32QAM is 2 and 7.5 Gbit/s larger than PS-32QAM and R-32QAM, respectively.

[1]  Jianjun Yu,et al.  Probabilistic shaping for ROF system with heterodyne coherent detection , 2017 .

[2]  B Moore,et al.  Pairwise optimization of modulation constellations for non-uniform sources , 2009, Canadian Journal of Electrical and Computer Engineering.

[3]  Xinying Li,et al.  8×506-Gb/s 16QAM WDM Signal Coherent Transmission over 6000-km Enabled by PS and HB-CDM , 2018, 2018 Optical Fiber Communications Conference and Exposition (OFC).

[4]  Xinying Li,et al.  Improved Performance of high-order QAM OFDM Based on Probabilistically Shaping in the Datacom , 2018, 2018 Optical Fiber Communications Conference and Exposition (OFC).

[5]  Xinying Li,et al.  Probabilistically Shaped 1024-QAM OFDM Transmission in an IM-DD System , 2018, 2018 Optical Fiber Communications Conference and Exposition (OFC).

[6]  Patrick Schulte,et al.  Constant Composition Distribution Matching , 2015, IEEE Transactions on Information Theory.

[7]  Amirhossein Ghazisaeidi,et al.  Advanced C+L-Band Transoceanic Transmission Systems Based on Probabilistically Shaped PDM-64QAM , 2017, Journal of Lightwave Technology.

[8]  John D. Downie,et al.  Capacity-approaching transmission over 6375 km at spectral efficiency of 8.3 bit/s/Hz , 2016, 2016 Optical Fiber Communications Conference and Exhibition (OFC).

[9]  Xinying Li,et al.  Experimental Demonstration of Four-Channel WDM 560 Gbit/s 128QAM-DMT Using IM/DD for 2-km Optical Interconnect , 2017, Journal of Lightwave Technology.

[10]  Jianjun Yu,et al.  Single-carrier 400G PM-256QAM generation at 34 GBaud trading off bandwidth constraints and coding overheads , 2017, 2017 Optical Fiber Communications Conference and Exhibition (OFC).

[11]  Shaoliang Zhang,et al.  Constellation design with geometric and probabilistic shaping , 2018 .

[12]  Jianjun Yu,et al.  Symmetrical 50-Gb/s/λ PAM-4 TDM-PON in O-band with DSP and Semiconductor Optical Amplifier Supporting PR-30 Link Loss Budget , 2018, 2018 Optical Fiber Communications Conference and Exposition (OFC).

[13]  Jianjun Yu,et al.  EML-based IM/DD 400G (4×112.5-Gbit/s) PAM-4 over 80 km SSMF based on linear pre-equalization and nonlinear LUT pre-distortion for inter-DCI applications , 2017, 2017 Optical Fiber Communications Conference and Exhibition (OFC).

[14]  Zhen Qu,et al.  Flex-Rate Transmission using Hybrid Probabilistic and Geometric Shaped 32QAM , 2018, 2018 Optical Fiber Communications Conference and Exposition (OFC).

[15]  Ivan B. Djordjevic,et al.  Geometrically Shaped 16QAM Outperforming Probabilistically Shaped 16QaM , 2017, 2017 European Conference on Optical Communication (ECOC).

[16]  Jianjun Yu,et al.  1.6Tb/s (4×400G) unrepeatered transmission over 205-km SSMF using 65-GBaud PDM-16QAM with joint LUT pre-distortion and post DBP nonlinearity compensation , 2017, 2017 Optical Fiber Communications Conference and Exhibition (OFC).