16QAM transmission with 5.2 bits/s/Hz spectral efficiency over transoceanic distance.

We transmit 160 x 100 G PDM RZ 16 QAM channels with 5.2 bits/s/Hz spectral efficiency over 6,860 km. There are more than 3 billion 16 QAM symbols, i.e., 12 billion bits, processed in total. Using coded modulation and iterative decoding between a MAP decoder and an LDPC based FEC all channels are decoded with no remaining errors.

[1]  M. Cvijetic,et al.  Proposal for Beyond 100-Gb/s Optical Transmission Based on Bit-Interleaved LDPC-Coded Modulation , 2007, IEEE Photonics Technology Letters.

[2]  Jin-Xing Cai,et al.  20 Tbit/s capacity transmission over 6,860 km , 2011 .

[3]  E. Ip,et al.  101.7-Tb/s (370×294-Gb/s) PDM-128QAM-OFDM transmission over 3×55-km SSMF using pilot-based phase noise mitigation , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[4]  B. Zhu,et al.  Transmission of a 1.2-Tb/s 24-carrier no-guard-interval coherent OFDM superchannel over 7200-km of ultra-large-area fiber , 2009, 2009 35th European Conference on Optical Communication.

[5]  Yang Li,et al.  FPGA verification of a single QC-LDPC code for 100 Gb/s optical systems without error floor down to BER of 10−15 , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[6]  S. Chandrasekhar,et al.  Generation and 1,200-km transmission of 448-Gb/s ETDM 56-Gbaud PDM 16-QAM using a single I/Q modulator , 2010, 36th European Conference and Exhibition on Optical Communication.

[7]  A. Pilipetskii,et al.  Direct measure of system margin enhancement by polarization scrambling , 2004, Optical Fiber Communication Conference, 2004. OFC 2004.

[8]  Ting Wang,et al.  Transmission of 115×100G PDM-8QAM-OFDM channels with 4bits/s/Hz spectral efficiency over 10,181km , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[9]  Ting Wang,et al.  On the reverse concatenated coded-modulation for ultra-high-speed optical transport , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[10]  Ting Wang,et al.  PMD Compensation in Polarization-Multiplexed Multilevel Modulations by Turbo Equalization , 2009, IEEE Photonics Technology Letters.

[11]  Ting Wang,et al.  Multi-dimensional LDPC-coded modulation for high-speed optical communication systems , 2009, 2009 IEEE/LEOS Summer Topical Meeting.