What is a 120km optical module

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A 120km SFP is a high-performance optical transceiver designed to transmit and receive data over single-mode fiber across distances reaching up to 120km. We offer both the DWDM-100G-Q28-120 and the DWDM2-100G-Q28-80, and we also frequently get a lot of questions regarding these modules, their differences, and their specifications. Modern long-haul SFP solutions—capable of 80 km and 120 km link distances—enable efficient, cost-effective fiber deployments across campuses, metro networks, and remote data centers. To exceed 120km, traditional solutions rely on EDFA optical amplifiers or dispersion compensation modules. As global network operators accelerate the deployment of 400G long-haul and DCI (Data Center Interconnect) networks, the demand for high-capacity, long-reach, and wavelength-flexible optical modules continues to grow.

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