Reduction of channel power instabilities in Raman amplifiers for ROADM configured WDM networks

In this article, an all optical device for reduction of transients in broadband Raman amplifiers caused due to channel switching in reconfigurable networks is presented. The passive device employs Self Phase Modulation (SPM) with filtering to effect this control. Si₃N₄-SiO₂ waveguide is designed and simulated to create a effective medium for non-linear effects, and used along with Arrayed Waveguide Grating(AWG). The component achieves a reduction of transient levels from 2 dB to 0.5 dB in surviving channel due to 8 disturbing channel drop when simulated in the system domain. Bit error rate performance of the link is also considerably improved.