Ko te attenuator muka optic me te Mechanically Variable muka whatu he taputapu hāngū hei whakaiti i te kaha kaha o te tohu marama me te kore e tino huri i te ahua ngaru ake.Ko te nuinga o nga wa he whakaritenga tenei i roto i te Dense Wave Division Multiplexing (DWDM) me te Erbium Doped Fiber Amplifier (EDFA) tono kaore e taea e te kaiwhiwhi te whakaae ki te tohu i hangaia mai i te puna marama-kaha.