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Mosep
Mosep
Explorer
September 15, 2025
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Sfp module

  • September 15, 2025
  • 1 reply
  • 1063 views

Hello, I’m looking for a 10G Single mode SFP module to connect a switch and Fortinet routers over a short distance (around 2–10 meters). Could you recommend the right option?

Best regards,

Best answer by Toshi_Esumi

I never used single mode SFP/SFP+ for any short range. But that's my concern too if it's very short distance. If receiving optical power is -2 dBm or above it could damage the optic. 

Toshi

1 reply

Toshi_Esumi
SuperUser
Toshi_Esumi
SuperUser
September 15, 2025

This is the official datasheet from FTNT.
https://www.fortinet.com/content/dam/fortinet/assets/data-sheets/Fortinet_Transceivers.pdf
If I were to pick one multi-mode SFP+ (technically not SFP) for internal datacenter use from the list, I would use FN-TRANS-SFP+SR. "SR" part indicates multi-mode. "LR" is for single-mode.

Some optic vendors sell Fortinet compatible SFP/SFP+. You can pick one of those as well. FGT/FSW generally don't check the vendor ID to reject those non-genuine ones unlike Cisco. 

Toshi

    Toshi_Esumi
    SuperUser
    Toshi_Esumi
    SuperUser
    September 15, 2025

    I'm sorry. Obviously I didn't read your post carefully. You're looking for a single mode SFP+. Then the answer should be FN-TRANS-SFP+LR. Not sure why it has to be a single mode though.

    Toshi

      Mosep
      MosepAuthor
      Explorer
      September 15, 2025

      The rest of the infrastructure is single-mode, so to avoid any mistakes it’s best to use an SM SFP. One more question: could the FN-TRANS-SFP+LR be too powerful in terms of transmit power for short distances? Would an optical attenuator be required in that case?

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