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Optical power is based on the heating power of the light, and some optical lab instruments actually
Optical power value of single-mode optical module
A typical single-mode optical module has a transmit power ranging from approximately -5 dBm to +5 dBm, depending on the module type and distance requirements.
Overview
Single-mode optical modules, such as SFP, SFP+, or XFP transceivers, are designed to transmit data over single-mode fiber (SMF), which has a small core (≈9 µm) and supports only one propagation mode . These modules operate at wavelengths of 1310 nm or 1550 nm, optimized for long-distance transmission with low attenuation . The small core and precise laser sources allow signals to travel tens of kilometers with minimal dispersion.
Typical Transmit Power
- Short-range single-mode modules (e.g., 10GBASE-LR, 1GBASE-LX): Transmit power is usually -3 dBm to 0 dBm, suitable for distances up to 10 km .
- Long-range or extended-range modules (e.g., 10GBASE-ER, 100G-LR4): Transmit power can reach 0 dBm to +5 dBm, supporting distances up to 40–80 km or more, depending on fiber quality and optical budget .
- Receiver sensitivity: Typically ranges from -14 dBm to -3 dBm, ensuring reliable detection of the optical signal over the intended distance.
Factors Affecting Power
- Module type: LR (long reach), ER (extended reach), and DWDM modules have different power specifications.
- Fiber attenuation: Higher-quality fibers allow lower transmit power for the same distance.
- Connector and splice losses: Each connector or splice introduces small losses, which must be accounted for in the optical budget.
- Temperature and aging: Laser output can vary slightly with temperature and over time.
Summary
Single-mode optical modules are optimized for long-distance, high-speed communication. Their transmit power typically ranges from -5 dBm to +5 dBm, with exact values depending on the module type, wavelength, and link distance. Proper selection ensures sufficient optical budget for reliable data transmission over single-mode fiber .
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