Patent ID: 7664397
Filing Date: 2010-02-16
Classification: H04J

Abstract:
1. An optical network system provided with optical transmitting/receiving nodes serving as optical transmitting/receiving end offices of an optical signal, optical route switching nodes for switching optical routes of said optical signal, and a network management system for managing the nodes and optical transmission lines connecting the nodes, comprising: a change generating function unit temporarily changing an optical power of said optical signal, which has a step-like waveform, as transmitted from an optical transmitting/receiving node; a change detecting function unit detecting whether the change of the optical power has appeared at an input port and an output port at each involved optical route switching node; a wavelength path monitoring function unit extracting only monitored optical route switching nodes through which the wavelength path to be monitored passes and their respective, involved input ports and output ports, based on network configuration information held by said network management system, and confirming that said changes have appeared at all of the involved input ports and output ports based on the results of change detections obtained from said change detecting function units for the extracted monitored optical route switching nodes so as to confirm connection and tracking of the wavelength path to be monitored; and optical amplifiers amplifying said optical signal and operating under ALC in said optical network system and said change generating function unit is a function unit generating a change of optical power of said optical signal, wherein said change generating function unit generates said change at a speed faster than a response speed of said ALC so that the optical amplifiers do not amplify the received optical power changed signal, wherein said network management system further comprises a managing unit managing end offices so as not to allow simultaneous generation of changes to wavelength paths when there are a plurality of wavelength paths with the same wavelengths of optical signals transferred on wavelength paths, but different optical routes in said optical network system.