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Transmission of 117.6Gb/s optical PDM-16QAM OFDM signals over 10,181km is demonstrated at 25-GHz channel spacing with 4.7 b/s/Hz spectral efficiency. All the errors have been corrected by using 25% overhead QC-LDPC after multi-band nonlinearity compensation.
We propose reverse concatenated code with inner BCH code and outer LDPC code. BCH decoder is based on MAP-decoding that provides high-accuracy-reliabilities for suboptimum-LDPC-decoder, leading to performance comparable to long-girth-12-LDPC codes, but with lower decoder-complexity.
A structure of non-adaptive decision-aided maximum likelihood is demonstrated by introducing a forgetting factor via both analysis and experiments, which achieves the same performance as the adaptive phase estimation while reducing the algorithm complexity.
We propose the reverse concatenated code as a forward error correction (FEC) scheme suitable for beyond 100-Gb/s optical transmission. In this scheme, BCH code is used as inner code and low-density parity-check (LDPC) code as outer code. The BCH decoder is implemented based on maximum a posteriori (MAP) decoding such as the BCJR/Ashikmin's algorithm, and an LDPC decoder is based on a min-sum-with-correction-term...
We propose a multi-dimensional LDPC-coded-modulation-scheme to achieve high-transmission rates of 320 Gb/s and beyond. This scheme utilizes currently-available commercial components operating at 40 Giga-symbols/s, and can reach 400 Gb/s aggregate rate with a coding gain of 10.75 dB.
Polarization-multiplexed coded-modulation, with joint coherent MAP detection and soft-iterative decoding, which considers independent symbols transmitted over both polarizations as a super-symbol is proposed. Penalty of only 1.5 dB at 20 Gb/s for DGD of 100 ps is reported.
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
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