Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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DEVELOPMENT OF MONITORING SYSTEMS FOR PASSIVE OPTICAL NETWORKS WITH UPGRADE OF DISTRIBUTION SUBNETS

Alyushina S.G. 1
1 Povolzhskiy State University of Telecommunication and Informatics
The paper discusses the development of monitoring technologies of passive optical networks with modernization of its distribution subnets. Mask clustering of optical distribution subnets from the side of optical network units is proposed with the construction of a system for monitoring their temperature con¬ditions. Fiber Bragg gratings with a phase shift, and only the phase sampling, are used as the masks and can be manufactured by simple phase masks with minimum requirements for the modulation parameters and uniformity of the refractive index profile characteristics. In order to compensate insertion loss of structured gratings a compensation mechanism based on a two-frequency heterodyning of the received monitoring signals is introduced on the side of optical line terminal. It has been shown that the use of these techniques allow to get signal level of monitoring system with the energy reserve to 35 dB in accordance with the FSAN and ITU-T recommendations.