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Proceedings Paper

Can 100Gb/s wavelengths be deployed using 10Gb/s engineering rules?
Author(s): Ross Saunders; Gary Nicholl; Kevin Wollenweber; Ted Schmidt
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Paper Abstract

A key challenge set by carriers for 40Gb/s deployments was that the 40Gb/s wavelengths should be deployable over existing 10Gb/s DWDM systems, using 10Gb/s link engineering design rules. Typical 10Gb/s link engineering rules are: 1. Polarization Mode Dispersion (PMD) tolerance of 10ps (mean); 2. Chromatic Dispersion (CD) tolerance of ±700ps/nm; 3. Operation at 50GHz channel spacing, including transit through multiple cascaded [R]OADMs; 4. Optical reach up to 2,000km. By using a combination of advanced modulation formats and adaptive dispersion compensation (technologies rarely seen at 10Gb/s outside of the submarine systems space), vendors did respond to the challenge and broadly met this requirement. As we now start to explore feasible technologies for 100Gb/s optical transport, driven by 100GE port availability on core IP routers, the carrier challenge remains the same. 100Gb/s links should be deployable over existing 10Gb/s DWDM systems using 10Gb/s link engineering rules (as listed above). To meet this challenge, optical transport technology must evolve to yet another level of complexity/maturity in both modulation formats and adaptive compensation techniques. Many clues as to how this might be achieved can be gained by first studying sister telecommunications industries, e.g. satellite (QPSK, QAM, LDCP FEC codes), wireless (advanced DSP, MSK), HDTV (TCM), etc. The optical industry is not a pioneer of new ideas in modulation schemes and coding theory, we will always be followers. However, we do have the responsibility of developing the highest capacity "modems" on the planet to carry the core backbone traffic of the Internet. As such, the key to our success will be to analyze the pros and cons of advanced modulation/coding techniques and balance this with the practical limitations of high speed electronics processing speed and the challenges of real world optical layer impairments. This invited paper will present a view on what advanced technologies are likely candidates to support 100GE optical IP transport over existing 10Gb/s DWDM systems, using 10Gb/s link engineering rules.

Paper Details

Date Published: 10 September 2007
PDF: 9 pages
Proc. SPIE 6774, Optical Transmission Systems and Equipment for Networking VI, 67740B (10 September 2007); doi: 10.1117/12.752572
Show Author Affiliations
Ross Saunders, StrataLight Communications Inc. (United States)
Gary Nicholl, Cisco Systems, Inc. (United States)
Kevin Wollenweber, Cisco Systems, Inc. (United States)
Ted Schmidt, StrataLight Communications Inc. (United States)

Published in SPIE Proceedings Vol. 6774:
Optical Transmission Systems and Equipment for Networking VI
Werner Weiershausen; Benjamin B. Dingel; Achyut Kumar Dutta; Ken-ichi Sato, Editor(s)

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