Demonstration of Fast Restorable All-Optical WDM Network

Jong Kwon KIM
Ho Chul JI
Hwan Seok CHUNG
Chul Han KIM
Seung Kyun SHIN
Duck Hwa HYUN
Yun Chur CHUNG

Publication
IEICE TRANSACTIONS on Electronics   Vol.E84-C    No.5    pp.493-500
Publication Date: 2001/05/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Issue on Recent Progress in Optoelectronics and Communications)
Category: Communication Networks
Keyword: 
all-optical network,  restoration,  wavelength-division multiplexing,  optical cross-connect,  

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Summary: 
We report on the demonstration of a fast restorable all-optical WDM network. This network consisted of four 44 optical cross-connects (OXC's) and four in-line optical amplifiers. These OXC's monitored not only the status of various network elements and quality of optical signals but also the optical path of each channel continuously. Thus, this network could automatically identify the causes of most network failures. For the fast restoration, we implemented these OXC's by using thermo-optic polymer switches (switching time: < 1.5 ms) and used hardware interrupt when LOS was detected. In addition, we used a pre-planned routing table made by using a simple heuristic routing and wavelength assignment algorithm. The results show that this network could be restored from any single link failure within 6 ms even when the restoration path was 400 km.