Mathematical modelling and BER analysis of 100 Gbs NOLM demultiplexer using a soliton-shaped pulse for control and data

A mathematical model for the non-linear optical loop mirror (NOLM) demultip lexer, operating with a soliton-shaped pulse for both control and data, is presented. The model can be used: to optimise system parameters (control pu lse width, walk-off time etc.) for maximising peak transmittance of the swi tching profile; to calculate the switching profile width; and to estimate t he switching profile through a new convolution approach. The simulation res ults are verified by numerically solving the non-linear Schrodinger equatio n. The NOLM model is then integrated into an optical receiver model for a b it error rate (BER) analysis. Simulation results show that BER, timing jitt er noise and cross-talk are strongly dependent on the walk-off time between control and signal pulses in NOLM demultiplexing. The dependence of the BE R on walk-off time agrees qualitatively with experimental results reported elsewhere.