What wavelength does a 10G optical module use
10G optical modules typically use 850 nm for multimode fiber and 1310 nm or 1550 nm for single-mode fiber.
Overview of 10G Optical Module Wavelengths
10G optical modules, such as SFP+ transceivers, operate at specific wavelengths depending on the fiber type and reach requirements:
- 850 nm: Used for short-reach (SR) applications over multimode fiber (MMF), typically within data centers or between adjacent racks. This wavelength is cost-effective but limited in distance due to modal dispersion, usually up to 300–400 meters on OM3/OM4 fiber .
- 1310 nm: Used for long-reach (LR) applications over single-mode fiber (SMF), supporting distances up to 10 km. This wavelength minimizes chromatic dispersion and attenuation, making it ideal for campus or metro links .
- 1550 nm: Used for extended-reach (ER) or long-haul single-mode fiber links, often exceeding 40 km. It offers lower attenuation than 1310 nm, suitable for metropolitan or carrier networks .
Practical Considerations
- Fiber Type Compatibility: 850 nm modules are incompatible with single-mode fiber, while 1310 nm and 1550 nm modules are designed for single-mode fiber.
- Link Budget and Distance: The choice of wavelength directly affects maximum transmission distance, signal attenuation, and dispersion. 1310 nm is preferred for medium distances, while 1550 nm is used for longer spans.
- Module Selection: SFP+ LR modules specifically use 1310 nm distributed feedback (DFB) lasers to maintain signal integrity over 10G links up to 10 km without dispersion compensation . In summary, when deploying 10G optical modules, 850 nm is standard for short-reach multimode links, 1310 nm for long-reach single-mode links, and 1550 nm for extended-reach single-mode links, ensuring optimal performance and compatibility with the fiber infrastructure .
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