Article Overview
Typical single-mode fiber transceivers operate with transmit power between -5 to +5 dBm and receiver sensitivity from -14 to -24 dBm, depending on wavelength and link distance.
Transmit and Receive Power Levels
- 1310 nm transceivers (e.g., LX modules):
- Transmit power: -5 to 0 dBm
- Receiver sensitivity: down to -14 dBm
- Typical link distance: 10–15 km
- 1550 nm transceivers (e.g., ZX modules):
- Transmit power: 0 to +5 dBm
- Receiver sensitivity: down to -24 dBm
- Typical link distance: 40–80+ km These ranges ensure reliable signal transmission over standard single-mode fiber while accounting for fiber attenuation and connector/splice losses .
Fiber Attenuation
Single-mode fiber exhibits low attenuation, which is wavelength-dependent:
- 1310 nm: ~0.4 dB/km
- 1550 nm: ~0.25 dB/km Lower attenuation at 1550 nm makes it ideal for long-haul communications, while 1310 nm is commonly used for medium-range links .
Practical Considerations
- Link Budget: The difference between TX power and RX sensitivity, minus fiber and connector losses, determines the maximum link distance.
- Optical Attenuators: High TX power on short links can overwhelm the receiver; attenuators may be required to prevent damage.
- Connector and Splice Losses: Typical connector loss is 0.3–0.75 dB, and splices add 0.05–0.3 dB per joint .
- Installation: Avoid tight bends and ensure clean connectors to minimize additional loss.
Summary
For standard single-mode fiber transceivers:
- TX power: -5 to +5 dBm
- RX sensitivity: -14 to -24 dBm
- Fiber attenuation: 0.25–0.4 dB/km depending on wavelength These values provide a reliable baseline for designing and testing single-mode fiber optic links, ensuring proper signal strength and system performance over the intended distance .
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