How many kilometers is the LH20 optical module

The LH20 optical module supports a maximum transmission distance of 20 kilometers over single-mode fiber. The LH20 optical module, including variants such as H3C SFP-GE-LH20-SM1490-CW, HS-SFP-GE-LH20-BIDI-1310, and 10GBASE-LH20 SFP+, is designed to operate over single-mode fiber (SMF) with a wavelength typically around 1310nm. It provides reliable data transmission for both 1Gbps and 10Gbps networks, depending on the specific module type.

The module uses LC duplex connectors and supports full-duplex communication, converting electrical signals to optical signals at the transmitting end and back to electrical signals at the receiving end. These modules are suitable for enterprise LANs, data center networks, ISP uplinks, and long-distance optical links, offering stable performance with low power consumption and built-in Digital Diagnostic Monitoring (DDM/DOM) for real-time monitoring of optical power, temperature, and voltage. The 20 km range ensures that the module can cover medium-distance connections without the need for additional signal amplification or repeaters, making it ideal for backbone or inter-building network links.

In summary, the LH20 optical module reliably covers up to 20 kilometers over single-mode fiber, supporting high-speed Ethernet connections with robust monitoring and compatibility across multiple network devices.