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Normal power values ​​for optical modules

Typical SFP optical modules operate with TX power around -9 to -3 dBm and RX power around -19 to -3 dBm, depending on module type and fiber.Transmit (TX) Power

TX power is the optical power emitted by the module when sending data. For standard SFP modules:

  • Short-range multimode modules (MMF, 850 nm): TX power typically ranges from -9 dBm to -3 dBm.
  • Single-mode modules (SMF, 1310/1550 nm): TX power can range from 0 dBm to +5 dBm for standard distances, and higher for long-haul or DWDM modules .
  • TX power above the specified range can cause receiver saturation, while too low TX power reduces the optical budget and may lead to link errors.
Receive (RX) Power

RX power is the optical power received by the module. Typical ranges are:

  • Normal operating RX power: -9.5 dBm to -1 dBm for most SFP modules .
  • Minimum RX sensitivity: Modules can often detect signals down to -19 dBm for short-range modules or -30 dBm for long-haul modules .
  • RX power below the minimum sensitivity usually indicates excessive loss, dirty connectors, or fiber faults.
Practical Guidelines
  • A healthy link usually shows TX power in the -1 to -7 dBm range and RX power in the -1 to -9.9 dBm range .
  • Values near -30 dBm or lower typically indicate no signal or the receiver is reading the noise floor.
  • Always consult the module datasheet for exact TX/RX ranges, as they vary by module type, data rate, and fiber type .
  • Consider the optical power budget, calculated as TX power minus RX sensitivity, to ensure reliable transmission over the intended distance .
Summary
  • TX Power (Transmit): -9 dBm to -3 dBm (MMF), 0 dBm to +5 dBm (SMF)
  • RX Power (Receive): -19 dBm to -3 dBm (typical), with minimum sensitivity down to -30 dBm for long-haul
  • Healthy operating range: TX -1 to -7 dBm, RX -1 to -9.9 dBm
  • Always verify against the specific SFP datasheet and consider fiber type, distance, and connector quality for accurate assessment.
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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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