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What jumpers are needed for an optical module

Optical network knowledge brief Published 03 Mar 2024

Prepared for preliminary research by the COETZER OPTICAL knowledge desk. Confirm compatibility, loss budgets and installation requirements against current standards and product documentation.

The type of fiber jumper required depends on the optical module's interface, transmission mode, and distance, typically using LC, SC, ST, or MPO/MTP connectors in simplex or duplex configurations.

Connector Type and Module Compatibility
  • LC connectors: Commonly used with SFP, SFP+, XFP, X2, and XENPAK modules. They feature a modular jack latch mechanism for easy operation and are widely used in routers and switches ( ).
  • SC connectors: Typically used with GBIC modules. They have a rectangular shell and a plug-in pin latch fastening method, suitable for patch panels and network equipment ( ).
  • ST connectors: Often used in fiber distribution frames and older 10Base-F connections. They have a round shell and a turnbuckle fastening method ( ).
  • MPO/MTP connectors: Used for high-speed 40G/100G optical transceivers. These multi-fiber connectors are required for modules with MTP/MPO interfaces ( ).
  • MT-RJ connectors: Square transceiver connectors used in some duplex fiber transceivers ( ).
Simplex vs Duplex
  • Duplex fiber jumpers: Required for modules with two ports (one for transmitting, one for receiving), such as standard LC or SC duplex modules ( ).
  • Simplex fiber jumpers: Required for BiDi (bidirectional) optical modules, which use a single port for both transmitting and receiving signals ( ).
Fiber Mode and Color Coding
  • Single-mode fiber (SMF): Thinner core (~9 µm), suitable for long-distance transmission (10 km or more), typically yellow jacket ( ).
  • Multimode fiber (MMF): Thicker core (50 µm or 62.5 µm), suitable for short-distance transmission (up to 2 km), typically orange jacket ( ).
Selection Considerations

When choosing a fiber jumper for an optical module, consider:

  1. Transmission distance: Short, medium, or long distance determines single-mode or multimode fiber.
  2. Data rate: Higher-speed modules (10G, 25G, 40G, 100G) may require MPO/MTP or LC duplex jumpers.
  3. Interface type: Ensure the jumper connector matches the module port (LC-LC, SC-SC, LC-SC, MPO-MPO, etc.).
  4. Module type: Hot-swappable modules like SFP/SFP+ typically use LC duplex; GBIC modules use SC; XFP/X2/XENPAK use LC ( ).

Choosing the correct fiber jumper ensures low insertion loss, high return loss, and reliable optical signal transmission, which is critical for maintaining network performance and efficiency.

What jumpers are needed for an optical module - COETZER OPTICAL SYSTEMS (Pty) Ltd [PDF]

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This reference is intended for preliminary optical-network research. Compatibility, link budgets, installation methods, test limits and applicable standards must be verified for the specific project.

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