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In this paper, we describe a feedback channel capacity inspired optimum signal constellation design (FCC-OSCD), for channel capacity achieving source distribution. The constellations obtained by FCC-OSCD are OSNR dependent. We demonstrate by Monte Carlo simulations that 32-ary signal constellation, obtained by FCC-OSCD, outperforms previously proposed optimized 32-ary signal constellation by 1.2 dB...
Polarization-multiplexed LDPC-coded QAM robust to I-Q imbalance and polarization offset is proposed. Efficient mitigation of I-Q imbalance and polarization offset is demonstrated with LDPC-coded turbo equalization by simultaneous MAP detection of symbols transmitted over two orthogonal polarizations. The proposed scheme is much more efficient in I-Q imbalance and polarization offset compensation than...
In this letter, we propose a multidimensional low-density parity-check-coded modulation scheme suitable for use in up to 400 Gb/s per wavelength transmission, using currently available commercial components operating at 40 giga-symbols/s. We show that we can achieve multiples of the current transmission speed with negligible penalty. At the same time, using this scheme, the transmission and signal...
Employing PDM-RZ-8QAM modulation, digital coherent detection and EDFA-only amplification, we demonstrate 25 GHz-spaced, 320times114Gb/s DWDM transmission through seven spans of ultra-low-loss fiber (average span length/loss of 82.8 km/14.6 dB) with a record capacity of 32Tb/s.
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