Experimental demonstration of 24-dimensional extended golay coded modulation with LDPC

We experimentally demonstrate ultra-long haul transmission of 24-D extended Golay coded modulation with LDPC. Compared with LDPC coded DP-BPSK, an increase of 15% in reach was shown, with a 3 dB increase in launch power margin at a transmission distance of more than 16,000 km. © OSA 2014

Detection of a 1 Tb/s superchannel with a single coherent receiver

We demonstrate detection of a superchannel with net bit rate in excess of 1 Tb/s with a single coherent receiver. Novel, pilot-aided equalization and carrier recovery algorithms enable detection of an 11 × 10 GBd DP-64QAM Nyquist superchannel (1.32 Tb/s gross bit rate)

Experimental demonstration of multi-pilot aided carrier phase estimation for DP-64QAM and DP-256QAM

We present a statistical inference based multi-pilot aided CPE algorithm and analyze its performance via simulations. We experimentally verify LDPC coded back-to-back performance using 10 GBd DP-64QAM and DP-256QAM modulation, with transmitter and receiver linewidths of 100 kHz

Design of a 1 Tb/s superchannel coherent receiver

We describe the design of a trained and pilot-aided digital coherent receiver, capable of detecting a 1 Tb/s superchannel with a single optical front-end. Algorithms for receiver training are described, which calculate the equalizer coefficients, subchannel SNRs, and centroids of the transmitted constellations. Algorithms for pilot-aided operation are then described in detail, providing pilot-aided constant modulus equalization and joint carrier-phase estimation over several coherent subchannels. We demonstrate the detection of a superchannel with net bit rate in excess of 1 Tb/s with a single coherent receiver. An 11× 10 GBd DP-64QAM Nyquist superchannel is used, with 1.32 Tb/s gross bit rate

Experimental demonstration of nonbinary LDPC convolutional codes for DP-64QAM/256QAM

We show the great potential of nonbinary LDPC convolutional codes (NB-LDPC-CC) with low-latency windowed decoding. It is experimentally demonstrated that NB-LDPC-CC can offer a performance improvement of up to 5 dB compared with binary coding