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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...
We propose hybrid LDPC-coded modulation schemes whose error correction performances and decoding complexities can be adjusted by changing the field orders of its component codes. Such flexible schemes are crucial assets in link budget analysis.
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.
By using only C-band EDFAs, we have transmitted hybrid 10times112 and 10times44 Gb/s PolMux-QPSK signals in 25 GHz channel spacing over 1600-km SSMF employing digital coherent detection. The measured BER for all channels is smaller than 1.2times10-3.
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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