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Digital Signal processing is going on spreading from long reach systems to short reach systems like inter-/intra-data center systems. The cost requirements for short reach systems are more stringent than requirements for long reach systems. And digital signal processing is attractive for cost reduction of optical and electrical components. In this paper, digital signal processing, especially Discrete...
Digital signal processing enabled coherent 100/400Gbit/s transceivers for long-reach links. Short-reach (<100km) links also demand 100/400Gbit/s but more stringent cost, size, and power consumption requirements need to be addressed. Potential modulation formats and signal processing methods are discussed.
Conventional Gardner clock recovery method fails on Nyquist signal with sinc pulse shape. A novel algorithm is proposed and verified by experiment. It has lower timing jitter, and its tolerance to various distortions is investigated.
We propose an efficient data aggregation through optical frequency conversion of discrete multi-tone (DMT) signals. We demonstrate distributed multiplexing of four DMT signals with BPSK to 128QAM, and achieve total 29.2-Gb/s data-multiplexing within 6-GHz bandwidth.
We investigate the impact of perturbation back-propagation algorithm on distribution of nonlinear noise in 224 Gb/s DP-16QAM transmission over large-Aeff pure silica core fiber and show the distribution approaches to Gaussian by the nonlinear compensation.
With proper phase rotation on perturbation terms, the enhanced intra-channel nonlinearity pre-distortion was proposed and demonstrated. The experiment shows that 1dB improvement is achieved and the performance is even better than back-propagation for RZ format.
We experimentally compare the performance of NGI-OFDM and Nyquist-WDM superchannels with same spectral efficiency in both back-to-back and transmission cases. Because of lower inter-carrier interference, the Nyquist-WDM has better performance than the NGI-OFDM.
We have experimentally demonstrated the highest capacity transmission of 73.2Gbps at back-to-back and 52.8Gbps after 20-km SMF transmission without optical amplifiers and dispersion compensation on discrete multi-tone systems with 10G directly modulated 1550-nm lasers.
We propose a low complexity intra-channel nonlinearity pre-distortion method based on symbol rate operation. The method is experimentally verified under a 43Gb/s DP-QPSK coherent system, and the performance is comparable with back-propagation method.
Intrachannel nonlinearity is considered a major distortion in high-capacity transmission systems particular for the case without inline optical chromatic dispersion compensation. In this paper, a low-complexity intrachannel nonlinear compensator operating at the symbol rate is proposed based on the nonlinear perturbation predistortion for the dual-polarization quadrature phase-shift keying (DP-QPSK)...
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