期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 38, 期 17, 页码 4744-4756出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.2996188
关键词
Dispersion; Phase noise; Laser noise; Transponders; Modulation; Digital signal processing; Multiplexing; ASIC design; digital sub-carrier multiplexing; DSP; high-capacity systems; high-order modulation formats; probabilistic shaping
The design of application-specific integrated circuits (ASIC) is at the core of modern ultra-high-speed transponders employing advanced digital signal processing (DSP) algorithms. This manuscript discusses the motivations for jointly utilizing transmission techniques such as probabilistic shaping and digital sub-carrier multiplexing in digital coherent optical transmissions systems. First, we describe the key-building blocks of modern high-speed DSP-based transponders working at up to 800G per wave. Second, we show the benefits of these transmission methods in terms of system level performance. Finally, we report, to the best of our knowledge, the first long-haul experimental transmission - e.g., over 1000 km - with a real-time 7 nm DSP ASIC and digital coherent optics (DCO) capable of data rates up to 1.6 Tb/s using two waves (2 x 800G).
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