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Proceedings Paper

DCI systems with ultra-low loss and low dispersion fiber
Author(s): Xiaojun Liang; John D. Downie; Ming-Jun Li; Hui Su; Jason E. Hurley; James E. Himmelreich; Hao Dong; Sergejs Makovejs
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Paper Abstract

Exponential growth of Internet traffic demands data center interconnect (DCI) systems to provide 400 Gb/s and higher per wavelength capacity under tight power consumption limitations for optical transceivers. We investigate the potential advantages of applying ultra-low loss and low dispersion fibers in DCI systems. Link optical signal to noise ratio (OSNR) and capacity analysis shows that ultra-low loss fiber (0.16 dB/km) provides significantly higher data capacity as compared with regular single-mode fiber (0.2 dB/km) for 80 km long DCI links. Also, the lower fiber attenuation reduces the required transceiver output power by 10 dB to achieve the same data capacity for 100 km DCI links. This implies substantial simplification in optical transceiver design. Digital chromatic dispersion compensation (CDC) is one of the major power consumers in optical transceivers. Our analysis shows that low dispersion fiber (4 ps/(nm·km)) reduces CDC computational complexity by 20% to 71% for different DCI link lengths versus regular single-mode fiber, indicating significant reduction in power consumption. Moreover, employing the CDC capability of the built-in adaptive filter in coherent receiver digital signal processing (DSP), the digital CDC unit could be completely removed using low dispersion fibers in DCI systems. Finally, we performed Monte-Carlo simulations of DCI links with different fiber types and confirmed the benefits of ultra-low loss and low dispersion fibers.

Paper Details

Date Published: 31 January 2020
PDF: 8 pages
Proc. SPIE 11309, Next-Generation Optical Communication: Components, Sub-Systems, and Systems IX, 113090A (31 January 2020); doi: 10.1117/12.2543074
Show Author Affiliations
Xiaojun Liang, Corning Science and Technology (United States)
John D. Downie, Corning Science and Technology (United States)
Ming-Jun Li, Corning Science and Technology (United States)
Hui Su, Corning Science and Technology (United States)
Jason E. Hurley, Corning Science and Technology (United States)
James E. Himmelreich, Corning Science and Technology (United States)
Hao Dong, Corning Science and Technology (United States)
Sergejs Makovejs, Corning Incorporated (United Kingdom)


Published in SPIE Proceedings Vol. 11309:
Next-Generation Optical Communication: Components, Sub-Systems, and Systems IX
Guifang Li; Xiang Zhou, Editor(s)

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