Abstract
A silent failure is a kind of failure that existing optical devices or equipment cannot detect although the failure actually happens. This failure makes it more difficult for maintenance operators to identify the fault point, which potentially deteriorates the reliability of the network. To address this issue, we propose a unique silent failure localization method using characteristic information obtained from the optical devices and equipment. As an example of the silent failures, a wavelength selective switch (WSS) failure is studied, and we propose a detection and localization scheme based on the method to use in a WSS failure scenario. Results of a field experiment revealed that the proposed scheme properly localize the fault point with an accuracy of within 4%.
Highlights
Optical transport systems need to handle higher capacity due to the rapid increase of internet traffic [1]
Characteristic information of optical signals is collected from a digital signal processor (DSP) and other optical devices in the receiving end transponders
The results revealed that utilization of chromatic dispersion (CD) can help to correctly localize the failure point
Summary
Optical transport systems need to handle higher capacity due to the rapid increase of internet traffic [1]. Key optical devices such as optical amplifier (AMP) and wavelength selective switch (WSS) need higher reliability and stability because optical signals carrying terabits of data flow into those devices. Failures in such devices significantly impact the whole network, which might lower the quality of service. Once a silent failure happens, maintenance operators have no way to identify the problem until they receive complaints from customers Even when they find out that a failure has occurred somewhere in the network, localizing the failure point incurs a huge amount of time as well as human resources. The results revealed that utilization of chromatic dispersion (CD) can help to correctly localize the failure point
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