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Proceedings Paper

Quaternary modulation formats for 100-Gbps optical links
Author(s): Thomas F. Detwiler; Steven M. Searcy; Robert Lingle Jr.; E. Bert Basch; Stephen E. Ralph
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Paper Abstract

The demand for 100 Gb/s optical links is rapidly spreading across all levels of the optical networking infrastructure. Many of the first deployments will be in the local area network (LAN) and metro-core and regional network environments. To address needs in LAN, the upcoming IEEE standard (IEEE P802.3ba) seeks 100 Gb/s over distances up to 40km. Furthermore metro-core/regional dense wavelength division multiplexing (DWDM) architectures require reach of several hundred km and the ability to pass through ten or more ROADMs. However, a number of fundamental challenges remain including the selection of appropriate modulation formats that are robust to a variety of nonlinearities, are sufficiently spectrally efficient, and able to withstand the strong optical filtering of cascaded ROADMs. Here we compare a variety of single-carrier quaternary modulation formats, each providing 2 bits/symbol/polarization and each likely to provide some advantages at 100Gb/s. Each format is presented with an appropriate MZM-based transmitter, and constrained by practical signal fidelity limitations that also enable comparison to experimental results from our 100G testbed. We primarily examine direct detection for cost-sensitive metro networks; however we also quantify the performance of coherent receivers, where applicable. Simulation results demonstrate the relative OSNR penalty (at a pre-FEC BER of 10-3) for a range of launch powers and adjacent channel formats.

Paper Details

Date Published: 22 January 2010
PDF: 10 pages
Proc. SPIE 7621, Optical Metro Networks and Short-Haul Systems II, 76210J (22 January 2010); doi: 10.1117/12.842454
Show Author Affiliations
Thomas F. Detwiler, Georgia Institute of Technology (United States)
Steven M. Searcy, Georgia Institute of Technology (United States)
Robert Lingle Jr., OFS (United States)
E. Bert Basch, Verizon (United States)
Stephen E. Ralph, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 7621:
Optical Metro Networks and Short-Haul Systems II
Werner Weiershausen; Benjamin Dingel; Achyut Kumar Dutta; Atul K. Srivastava, Editor(s)

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