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Proceedings Paper

Single-carrier versus sub-carrier bandwidth considerations for coherent optical systems
Author(s): John D. McNicol; Vinayak Dangui; Han Sun; David Krause; Kuang-Tsan Wu; Matthew Mitchell; Dave Welch
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Paper Abstract

40 and 100 Gb/s Ethernet services have been recently defined and 400G and 1 Tb/s services are anticipated in the future. Optical transport networks are capable of separating the services provided and the underlying optical transport; service bandwidths may be larger or smaller than the bandwidth carried on a single optical 'wave'. In this work, we compare different arrangements of optical transport systems using polarization division multiplexed (PDM) coherent modulation formats of 4 to 8 bits/symbol for baud rates spanning 8 - 91 GHz. A nonlinear threshold has been defined and nonlinear performances are compared over 20 uncompensated spans of SMF and NZDSF for various modulation formats. The finding is that lower baud rate equates to slightly more reach at equal capacity. For example, for 100G using single carrier vs. dual carrier on a 50 GHz BW, it is observed that for the EDFA-only case, using dual-carrier transmission yields a reach improvement of 5%, whereas in the Raman-assisted EDFA case, a reach improvement of 4% in favor of dual-carrier transmission. This shows that one can achieve the same or better optical performance without having to drive up the baud rate and the speed of associated electro-optics.

Paper Details

Date Published: 24 January 2011
PDF: 11 pages
Proc. SPIE 7960, Coherent Optical Communication: Components, Subsystems, and Systems, 796006 (24 January 2011); doi: 10.1117/12.881631
Show Author Affiliations
John D. McNicol, Infinera Canada (Canada)
Vinayak Dangui, Infinera (United States)
Han Sun, Infinera Canada (Canada)
David Krause, Infinera Canada (Canada)
Kuang-Tsan Wu, Infinera Canada (Canada)
Matthew Mitchell, Infinera (United States)
Dave Welch, Infinera (United States)

Published in SPIE Proceedings Vol. 7960:
Coherent Optical Communication: Components, Subsystems, and Systems
Guifang Li; Dieter Stefan Jäger, Editor(s)

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