I also have a Playback Desing Plink fibre streamer. Getting a Playback Designs DAC in the next few months. The fibre cables in this streamer are different from what is used in the Sonore and Lumin X1 gear. I believe it is considered industrial grade fibre.
The PLink should be rather good.
BTW - when I was considering the Tambaqui about 4 years ago. the distributer at GTT Audio told me the Aries streamer is a better streamer than the Network streamer in the Tambaqui. He also said when he demos the unit he uses the Aries streamer.