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Proceedings Paper

Architecture and design of optical path networks utilizing waveband virtual links
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Paper Abstract

We propose a novel optical network architecture that uses waveband virtual links, each of which can carry several optical paths, to directly bridge distant node pairs. Future photonic networks should not only transparently cover extended areas but also expand fiber capacity. However, the traversal of many ROADM nodes impairs the optical signal due to spectrum narrowing. To suppress the degradation, the bandwidth of guard bands needs to be increased, which degrades fiber frequency utilization. Waveband granular switching allows us to apply broader pass-band filtering at ROADMs and to insert sufficient guard bands between wavebands with minimum frequency utilization offset. The scheme resolves the severe spectrum narrowing effect. Moreover, the guard band between optical channels in a waveband can be minimized, which increases the number of paths that can be accommodated per fiber. In the network, wavelength path granular routing is done without utilizing waveband virtual links, and it still suffers from spectrum narrowing. A novel network design algorithm that can bound the spectrum narrowing effect by limiting the number of hops (traversed nodes that need wavelength path level routing) is proposed in this paper. This algorithm dynamically changes the waveband virtual link configuration according to the traffic distribution variation, where optical paths that need many node hops are effectively carried by virtual links. Numerical experiments demonstrate that the number of necessary fibers is reduced by 23% compared with conventional optical path networks.

Paper Details

Date Published: 13 February 2016
PDF: 7 pages
Proc. SPIE 9773, Optical Metro Networks and Short-Haul Systems VIII, 97730J (13 February 2016); doi: 10.1117/12.2209466
Show Author Affiliations
Yusaku Ito, Nagoya Univ. (Japan)
Yojiro Mori, Nagoya Univ. (Japan)
Hiroshi Hasegawa, Nagoya Univ. (Japan)
Ken-ichi Sato, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 9773:
Optical Metro Networks and Short-Haul Systems VIII
Atul K. Srivastava; Werner Weiershausen; Benjamin B. Dingel; Achyut K. Dutta, Editor(s)

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