Abstract
A novel ring encoder for passive optical network (PON) is proposed and analyzed in term of SNR and probability of false alarm (PFA). The encoder exploits a fiber ring and one Bragg grating to produce a multi-level periodic code. We obtain an SNR of 10 dB for 256 customers in 10ms measurement time with 20km traditional PON. For 100km long reach PON (LR-PON), we obtain an SNR of 10dB for 64 customers in very high 1.7 minutes measurement time. We also apply Neyman-Pearson testing to the receiver and we investigate how the network size affects the operational expenses of our monitoring system. We illustrate the receiver operating characteristics (ROCs) of the system showing the tradeoff between the detection and false alarm probabilities. We show that 95% detection probability (PD) for 128 traditional PON customers can be achieved with 0.006 false alarm probability (PFA) in 2ms measurement time which is 50 times smaller than PFA when averaging is not used.