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Proceedings Paper

Wireless optics protection of fiber via SONET ring closure
Author(s): Ruth Ann Mullen; Ken T. Celmer; Michael Foster; Jimmie Wooten; Jared Miller; John C. Kean; Doug Carter; Michael Kefauver; Bhupendra Singh; Maha Achour; Heinz A. Willebrand
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Paper Abstract

12 A free-space laser link closes an otherwise all-fiber SONET ring, demonstrating for the first time the feasibility of using wireless optics as a back-up to fiber in an application demanding the highest levels of statistical availability and sub-50-ms protection-restoral times. This experiment demonstrates that protocol-transparent wireless optical links can be readily internetworked with industry- standard fiber-based protection protocols to achieve SONET restoral times in the event of a fiber cut. By using the wireless optics as a back-up to fiber rather than as the primary link, end-users are normally protected from the unavoidable burst errors and outages that can arise on a wireless optical link in the event of anomalously poor atmospheric visibility or unanticipated line-of-sight obstructions. While an all-fiber SONET ring operating over physically diverse paths is generally preferred, hybrid fiber/air rings operating over physically-diverse paths (fiber as one path and air as the other) will easily meet or exceed existing Bellcore availability standards for SONET rings. The hybrid part-fiber, part-air ring advantageously protects customers from fiber cuts (a.k.a. `backhoe fade') and may be preferable to over service via either an unprotected fiber spur or over a `collapsed' fiber ring made up of fiber segments sharing a common conduit. The experiment is performed at an OC-12 (622 Mbps) data rate in a point-to-consecutive point configuration which demonstrates the use of a relay site to work-around a line- of-sight obstruction.

Paper Details

Date Published: 6 February 2001
PDF: 8 pages
Proc. SPIE 4214, Optical Wireless Communications III, (6 February 2001); doi: 10.1117/12.417510
Show Author Affiliations
Ruth Ann Mullen, XO Communications (United States)
Ken T. Celmer, Zephyr Systems, Inc. (United States)
Michael Foster, XO Communications (United States)
Jimmie Wooten, XO Communications (United States)
Jared Miller, XO Communications (United States)
John C. Kean, XO Communications (United States)
Doug Carter, XO Communications (United States)
Michael Kefauver, WFI (United States)
Bhupendra Singh, WFI (United States)
Maha Achour, LightPointe Communications, Inc. (United States)
Heinz A. Willebrand, LightPointe Communications, Inc. (United States)

Published in SPIE Proceedings Vol. 4214:
Optical Wireless Communications III
Eric J. Korevaar, Editor(s)

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