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DIY optical gigabit data diode

Simple fiber media converter mod to make it work like an data diode. Two TP-Link MC200CM (Ver4.0) needed.

1x TP-Link MC200CM (sender) €30
1x TP-Link MC200CM (receiver) €30
1x Multimode OM4 SC/SC fiber cable €5
€65 (vat incl)

Setup

Disclaimer

DO NOT DO THIS MOD UNLESS YOU KNOW IT IS SAFE
Hardware modifications can be potentially dangerous, cause fires and for sure void your warranty. Any modification you do is on your own risk, I take no responsibility whatsoever of the result of this mod. In some countries it may even be illegal to modify existing devices.
That said, I've been running multiple installation of these continuously for years without issues.

Mod

TP-Link MC200CM

Opened

Modded
(Click to enlarge)

  1. Desolder the two black capacitors on the receive line
  2. Solder equal length wires from the sender line pads to the receiver lines. Note that the wires cross!