100M Optical Module Wavelength
100M optical modules typically operate at 850nm for multi-mode fiber and 1310nm for single-mode fiber.
Multi-mode vs Single-mode
- Multi-mode (MMF): Used for short distances, generally under 2 km. The standard 100M multi-mode transceivers, such as 100BASE-SX, operate at 850nm wavelength and are cost-effective for campus or data center links .
- Single-mode (SMF): Used for longer distances, exceeding 2 km. Single-mode 100M transceivers, like 100BASE-LX or 100BASE-EX, typically operate at 1310nm wavelength, providing lower signal attenuation and higher bandwidth potential over long hauls .
Duplex and BiDi Modules
- Duplex transceivers: Use two fiber strands, one for transmitting (Tx) and one for receiving (Rx). They often employ different wavelengths on the same strand, such as Tx at 1310nm and Rx at 1550nm, to maximize fiber usage .
- Single-fiber BiDi transceivers: Allow bidirectional communication over a single fiber strand, requiring matched wavelength pairs on both ends of the link. This is ideal when fiber availability is limited .
Typical 100M SFP Examples
- SFP-100FX-31-I: Multi-mode fiber, 2 km reach, 1310nm wavelength, LC connector .
- SFP-100LX-31-I: Single-mode fiber, 10 km reach, 1310nm wavelength, LC connector .
Key Considerations
- Distance: Short links favor multi-mode (850nm), long links require single-mode (1310nm).
- Fiber type: Ensure the transceiver wavelength matches the fiber type (MMF or SMF).
- Connector type: LC is common for 100M SFP modules.
- Network design: Duplex or BiDi selection depends on fiber strand availability and infrastructure constraints . By matching the wavelength, fiber type, and distance requirements, you can ensure reliable 100M Fast Ethernet connectivity for your network deployment.
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