PCT’s EQMUXFC and EQDEMUXFC series multiplexers and demultiplexers provide high adjacent channel isolation to eliminate interference, wide passband performance to ensure stable operation for transmitters subject to wide temperature variations, and 1310 nm pass thru to accommodate existing standard 1310 nm networks. Up to 10 CWDM channels can be used above the fiber water peak, allowing for maximum leverage of legacy optical fibers.