10g Single-Mode Optical Module Sensitivity

Typical receiver sensitivity for 10G single-mode SFP+ modules ranges from approximately -8.2 dBm for 10GBASE-LR to around -14.4 dBm for 10GBASE-ER modules.10GBASE-LR (10 km, 1310 nm)10GBASE-LR modules operate at 1310 nm over single-mode fiber (SMF) and support link distances up to 10 km. They typically use a DFB transmitter and a PIN photodiode receiver. The receiver sensitivity for these modules is generally around -8.2 dBm, which ensures reliable 10Gbps transmission over the specified distance while maintaining a bit error rate (BER) of 10^-12. These modules comply with IEEE 802.3ae, SFF-8431, and SFF-8472 standards and are widely used in enterprise backbones, data centers, and metro networks .10GBASE-ER (40 km, 1310 nm)10GBASE-ER modules are designed for longer distances, up to 40 km over SMF, also operating at 1310 nm. They feature higher optical transmit power and improved receiver sensitivity compared to LR modules. Typical receiver sensitivity for 10GBASE-ER SFP+ modules is around -14.4 dBm, allowing compensation for higher fiber attenuation over extended distances. These modules support an optical link budget of approximately 17 dB and are compatible with SFF-8431, SFF-8432, and IEEE 802.3ae standards .Practical ConsiderationsOptical Budget: The receiver sensitivity, combined with transmitter power, determines the maximum achievable link distance. For LR modules, the optical budget is sufficient for 10 km, while ER modules can reach 40 km under ideal conditions .Fiber Type: Both LR and ER modules are designed for G.652 single-mode fiber. Fiber attenuation and connector losses must be considered to ensure the received power remains above the sensitivity threshold.Compatibility: LR and ER modules cannot be mixed on opposite ends due to differences in wavelength and sensitivity. Proper pairing is essential for reliable operation .Environmental Factors: Temperature variations and aging can affect receiver sensitivity, so modules are typically rated for commercial (0–70°C) and industrial (-40–85°C) ranges . In summary, 10GBASE-LR modules have a receiver sensitivity around -8.2 dBm, suitable for 10 km links, while 10GBASE-ER modules have a sensitivity around -14.4 dBm, supporting 40 km links over single-mode fiber. Proper optical budgeting and module pairing are critical for reliable 10G Ethernet performance.