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Abstract-Multiple-input multiple-output (MIMO) technology has been widely used as an efficient way to improve the capacity of wireless channels. As an optimal detection for MIMOOFDM systems, the maximum likelihood (ML) algorithm whose complexity rises exponentially with the number of transmit and receive antennas is not practical for real-time detection. Instead, the sphere decoding (SD) algorithm...
We investigated the convergence speed of a modified frequency-domain least-mean-square algorithm in few-mode fiber transmission systems. This algorithm improves the convergence speed by about 30% with negligible increase in implementation complexity.
We propose a new hybrid PLL/ML phase estimation method for low-complexity, blind phase recovery for M-QAM modulation. The linewidth tolerance of the proposed method is more than one order of magnitude better than PLL-only method.
An improved linewidth-tolerant two-stage feed-forward carrier phase recovery algorithm is proposed for high-order coherent modulation formats. Experimentally we show that the proposed new algorithm can reduce the required compute power by more than a factor of two for square 36QAM.
We review recent experimental studies using a 46 Gb/s dual-polarization QPSK transceiver with coherent detection and real-time digital signal processing, including its tolerance to various impairments. We also discuss its potential advantages from a carrier's perspective.
In this paper, we will report our latest experimental results. These includes 20 times 112-Gb/s PDM-RZ-QPSK transmission over 1540-km of standard single mode fiber (SSMF), a record capacity of 17 Tb/s within the C-band optical bandwidth (4.025 THz) over 660 km of ultra-low-loss fiber using 161 times 114-Gbps PDM-RZ-8PSK formats, and hybrid 10 times 112 Gb/s PDM-RZ-QPSK and 10 times 44 Gb/s PDM-NRZ-QPSK...
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.
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.
By using PolMux-RZ-QPSK modulation format and digital coherent detection, we have demonstrated 20times112 Gbit/s DWDM transmission over 1540 km of SSMF without using Raman amplification or optical dispersion compensation.
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