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S4 1 optical module operating distance

S4 1 optical module operating distance

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S4 1 optical module operating distance - BENNIE OPTICAL [PDF]

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The operating distance of an S4.1 optical module depends on fiber type and module specification, typically ranging from short-haul distances up to 15 km for single-mode fiber.

Overview

S4.1 optical modules are designed for STM-4 interfaces compliant with ITU-T G.957 standards, primarily supporting TDM traffic. They use LC connectors and can operate over both single-mode (SMF) and multi-mode fiber (MMF), with the effective distance determined by the fiber type, wavelength, and optical power budget .

Operating Distances

  • Short-Haul (SH) S4.1 Modules: Typically designed for distances up to a few kilometers over single-mode fiber, suitable for intra-city or campus networks .
  • Long-Haul (LH) S4.1 Modules: Can reach distances up to 15 km over single-mode fiber at 1310 nm wavelength, as indicated by standard SFP-OC12-SM13-15KM modules .
  • Multi-Mode Fiber (MMF): Distances are shorter due to higher attenuation, generally limited to a few hundred meters to 2 km depending on fiber grade (OM1, OM2, OM3) and module power budget .

Key Factors Affecting Distance

  1. Fiber Type: Single-mode fibers allow longer distances than multi-mode fibers due to lower attenuation and dispersion.
  2. Wavelength: Common S4.1 modules operate at 1310 nm, which balances distance and dispersion for SMF.
  3. Optical Power Budget: The difference between transmitter output power and receiver sensitivity determines maximum link length. Modules are designed to ensure sufficient margin for connector and splice losses .
  4. Environmental Conditions: Temperature, bending, and physical stress on the fiber can reduce effective distance.

Summary

For practical deployment, S4.1 optical modules over single-mode fiber can reliably operate up to 15 km, while multi-mode fiber modules are limited to shorter distances, typically under 2 km. Always consult the module's datasheet for exact power budget and distance specifications to ensure reliable network performance .

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