800G DSP ASIC Design Using Probabilistic Shaping and Digital Sub-Carrier Multiplexing
Han Sun, Mehdi Torbatian, Mehdi Karimi, Robert Maher, Sandy Thomson, Mohsen Nader Tehrani, Yuliang Gao, A. Kumpera, George Soliman, Aditya Kakkar, Mohamad Hairi Osman, Ziad A. El-Sahn, Clayton Doggart, Weikun Hou, Shailesh Sutarwala, Yuejian Wu, Mohammad Reza Chitgarha, V. Lal, Huan-Shang Tsai, S. Corzine, Jiaming Zhang, John Osenbach, S. Buggaveeti, Z. Morbi, Miguel Iglesias Olmedo, I. Leung, Xian Xu, Parmijit Samra, Vince Dominic, Steve Sanders, M. Ziari, Antonio Napoli, Bernhard Spinnler, Kuang-Tsan Wu, Parthiban Kandappan
Abstract
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 × 800G).