Experimental Comparison of Single-Sided and Double-Sided Filtering in ROADM Networks

We experimentally study filtering penalties for single-sided and double-sided passband narrowing from in-line ROADMs. Using 400-Gb/s single-carrier and 800-Gb/s dual-carrier coherent signals over an 800-km transmission link with up to 8 WSS, we observe lower penalties and increased ROADM node count with single-sided filtering conditions.