Optical power of 40km optical module

The optical power of a 40km module typically ranges from +4 dBm output to around -30 dBm receive sensitivity, depending on the module type and data rate.10G SFP+ 40km Modules10GBASE-ER SFP+ modules, designed for 40 km transmission over single-mode fiber, operate at a 1550 nm wavelength and use duplex LC connectors. These modules generally have an optical output power around 0 to +4 dBm and a receive sensitivity near -15 dBm, providing a link budget of approximately 15 dB, which ensures reliable long-distance connectivity between switches, routers, or storage systems . They are widely used in enterprise backbones, metro networks, and data center interconnects.100G QSFP28 40km ModulesFor higher-speed 100G modules, such as QSFP-ER4L or 100G OWDM, the output power is typically lower per lane, around 0 to +5 dBm, with receive sensitivity ranging from -8 dBm to -12 dBm per lane, depending on whether Forward Error Correction (FEC) is enabled . These modules operate at 1310 nm (ER4L) or in the O-band (OWDM) and use four-lane multiplexing to achieve 100G over 40 km. Power consumption is generally under 5.5 W, optimized for energy efficiency while maintaining long-reach performance.1.25G BIDI 40km ModulesLower-speed 1.25G BIDI modules use single-fiber bidirectional technology, transmitting and receiving on two different wavelengths (e.g., 1310 nm TX, 1550 nm RX). These modules can achieve output power up to +4 dBm and receive sensitivity down to -30 dBm, allowing stable 40 km transmission with a bit error rate as low as 10⁻¹² . The BIDI design reduces fiber usage by 50%, making it cost-effective for campus or suburban networks.SummaryOutput Power: +0 to +5 dBm (varies by module type and lane)Receive Sensitivity: -8 dBm to -30 dBm (depending on speed and FEC)Wavelengths: 1310 nm (100G ER4L), 1550 nm (10G ER), or dual wavelengths for BIDIApplications: Long-haul enterprise, metro, DCI, and telecom backbone networks These power specifications ensure that 40 km optical modules can maintain reliable high-speed transmission over single-mode fiber while accommodating network design constraints such as fiber loss, dispersion, and connector insertion loss.