Abstract
We present and analyze a 17.6-Tb/s DWDM optical transmission composed of 79 channels with 224-Gb/s RZ-DP-16QAM modulation format per-channel and coherent detection. A maximum reach of 678 km is obtained with an optical recirculation loop composed by 226 km of pure-silica core fibers and EDFA amplification only in a 50-GHz grid system with spectral efficiency of 4.2-b/s/Hz. Also, a 25-GHz Gaussian optical pre-filter is applied to each channel and the same reach of 678 km is obtained in a 37.5-GHz channel grid system with spectral efficiency of 5.6-b/s/Hz. These results demonstrate a 33% system capacity improvement without transmission penalties.
Highlights
Enabled by the increasing traffic in communications networks, which is mainly composed by highbandwidth data traffic, the optical fiber infrastructure is undergoing an evolution process in order to meet this wide variety of applications [1]
The increase of transmission rates and the spectral occupancy required for the maintenance of 50-GHz dense wavelengthdivision-multiplexing (DWDM) grid forced changes in the structure of transmission and reception in order to increase the spectral efficiency (SE) for systems with bit rates higher than 10-Gb/s
We demonstrate a 17.6-Tb/s DWDM optical system composed of 79 channels in a 50-GHz grid using 224-Gb/s RZ-DP-16QAM modulation format per-channel with 4.2-b/s/Hz SE and coherent detection with offline digital signal processing (DSP)
Summary
Enabled by the increasing traffic in communications networks, which is mainly composed by highbandwidth data traffic, the optical fiber infrastructure is undergoing an evolution process in order to meet this wide variety of applications [1]. Since the beginning of its existence the optical transmission systems were based on intensity modulation (OOK) up to 10-. The increase of transmission rates and the spectral occupancy required for the maintenance of 50-GHz DWDM grid forced changes in the structure of transmission and reception in order to increase the spectral efficiency (SE) for systems with bit rates higher than 10-Gb/s. Transmission structures with phase modulation and differential coding (DQPSK) and interferometerbased reception for phase difference extraction were used for 40-Gb/s systems [4]. These systems improved the spectral efficiency from 0.5-b/s/Hz (OOK) to 1-b/s/Hz (DQPSK).
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