Ethernet Passive Optical Network Monitoring using Various Types of Fiber Bragg Grating

Abstract

This paper presents a real-time monitoring system for Ethernet Passive Optical Network (EPON). A fiber Bragg grating (FBG) with a distinct Bragg wavelength, bandwidth and reflectivity is inserted at each distribution fiber. The FBG reflection spectrum is used as the fiber identifier. One Bragg wavelength is shared by two types of FBGs to optimize the bandwidth of monitoring source. Constructive interference concept is also employed in order to ensure high amplitude of FBGs reflection spectra which share the same Bragg wavelength. Thus, more customers can be monitored for the limited bandwidth of monitoring source. From the simulation result, it is found that this monitoring system is capable to monitor up to 32 customers with excess power margin of 2 dB and monitoring power received of -43.5 dBm.