Single-Carrier 400G 64QAM and 128QAM DWDM Field Trial Transmission Over Metro Legacy Links

Abstract

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A Pulse Shaping Based Optical Transmission System of 128QAM for DWDM with N × 904 Gbps

“…Currently, the transmission rate of a single wavelength is evolving from 100 Gpbs to 400 Gbps. Analyzing the core mechanisms and solving the key problems of single-wavelength optical fiber communication system with 400+ Gbps has become a recent focus in academia and industry [1][2][3][4][5][6][7]. In 2013, Bell laboratories reported a dual-carrier transmission system with the transmission distance of 320 km; the code-type of the transmission system was 64 quadrature amplitude modulation (QAM) format; and the capacity was up to 1.5 Tbps [8].…”

“…By analyzing the latest research in this field [1][2][3]6,8,9], we find that: (1) when the channel spacing is less than 50 GHz in a DWDM system, the cost of the array waveguide grating (AWG) and the difficulty of the production engineering will be greatly increased, and the interference between adjacent channels will be very serious; (2) the ratio of the transmission speed of a single wavelength to the spacing between two adjacent channels is relatively small, that is to say, the utilization efficiency of the spectrum is low; and (3) the coherent modulation and coherent detection are the core techniques in DWDM systems. For these reasons, we combine high-order coherent modulation with Gaussian optical filtering in an optical transmission system, and a DWDM system with ultra-high-speed and large capacity is realized.…”

Microwave photonics‐based all optical wavelength conversion of Nyquist‐DP‐16QAM for flex‐grid optical networks with 112 Gbps

“…Microwave photonics provides an idea for the development of the wireless communications. Coherent modulation, coherent demodulation, and multi‐carrier technology are widely researched in optical communications . These advanced technologies are gradually infiltrating into the field of optical access networks .…”

“…Coherent modulation, coherent demodulation, and multi-carrier technology are widely researched in optical communications. 4,5 These advanced technologies are gradually infiltrating into the field of optical access networks. 6,7 These technologies not only provided higher spectrum efficiency (SE) and transmission rate for the optical networks, but also utilized for the configuration of flexgrid optical networks.…”

Optical Transmitters without Driver Amplifiers—Optimal Operation Conditions

“…DPreD can also cancel, in part, the linear and non-linear distortions. The linear pre-distortion methods compensate for the low-pass characteristic of the transmitter, and therefore, eliminate the inter-symbol interference (ISI) of the signal [30][31][32][33][34][35][36][37]. Non-linear compensation methods can cancel the non-linear transfer function of driver amplifiers, digital-to-analog converters, and Mach-Zehnder modulators.…”