Real time FTTH network monitoring using binary coded fiber Bragg grating

Abstract

The rise in users on the Passive Optical Network (PON) has made the architecture of this network increasingly complex with a growing point-to-multi-point (P2MP) network. Thus, network monitoring has become more crucial and should be carried out in order to monitor the transmission of signals to each optical network unit (ONU) and prolonged service can be provided to the users without problems. A monitoring signal using limited bandwidth has been combined with data signals at the optical line terminal (OLT) at the central office to monitor the status of each ONU in the network. This signal has been transmitted along the fiber and will be used to reflect the spectrum of uniform fiber Bragg grating (FBG) located before the ONU. FBG binary codes will be used as an indicator between one ONU to another ONUs by varying the wavelength used by the FBGs in the network to represent each ONU. This paper presents two techniques to monitor network health by creating FBG configuration design (FBG codes) to identify fault branches as well as simulation results and performance parameters will be analysed and compared to obtain the best techniques by considering several aspects such as economical and technical.