JEWELBLU OPTICALFIBER PATCH CORDS Technical Inquiry

What fiber optic cable should be used for the SFP port

To connect a fiber optic cable to an SFP port, insert the SFP module into the device, remove dust caps, then plug in an LC duplex fiber cable—matching TX to RX and ensuring the fiber type (single‑mode or multimode) matches the SFP's specifications.Step‑by‑Step Connection
  1. Insert the SFP module

    • Push the SFP into the switch/router/media converter until it clicks.
  2. Prepare the fiber cable

    • Remove dust caps from both the SFP and the LC connectors.
    • Clean the fiber end faces to avoid insertion loss.
  3. Connect the LC duplex cable

    • Most SFPs use LC duplex connectors.
    • Connect TX → RX and RX → TX between devices; a straight TX→TX connection will not work.
  4. Verify link

    • Check that the Link LED illuminates.
    • Ensure wavelength, speed, and fiber type match the SFP module.
Choosing the Correct Fiber Cable

Different SFP modules require specific fiber types:

SFP TypeFiber TypeConnectorWavelengthNotesSX (1G)OM1/OM2 multimodeLC duplex850 nmShort‑distance LAN links LX (1G)OS2 single‑modeLC duplex1310 nmLong‑distance building links 10G SFP+ SROM3/OM4/OM5 multimodeLC duplex850 nmData center short‑reach 10G SFP+ LROS2 single‑modeLC duplex1310 nmUp to 10 km reach QSFP SR4 (40G/100G)OM3/OM4 MPOMPO/MTP850 nmParallel optics Key Compatibility Rules
  • Match fiber mode:
    • Single‑mode SFP ↔ single‑mode fiber
    • Multimode SFP ↔ multimode fiber
  • Match connector type (usually LC).
  • Match wavelength (850 nm for MM, 1310 nm for SM).
  • Ensure TX/RX crossover for duplex fiber.

Correct pairing of SFP module, fiber type, and connector ensures stable optical links and prevents common issues such as no link or abnormal optical power.

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Technical note

This reference is intended for preliminary fiber optic patch cord research. Compatibility, link budgets, connector types, polish, installation methods, test limits and applicable standards must be verified for the specific project.

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