The 100G-4WDM-QSFM40KM transceiver is a high-capacity QSFM form factor module designed for 100 Gigabit Ethernet communication over long distances up to 40 kilometers. Utilizing four-wavelength division multiplexing (4WDM) technology on single-mode fiber, this transceiver provides efficient bandwidth utilization by carrying four independent optical signals on one fiber strand. This module is well-suited for metro and long-haul network applications where extended reach and high data throughput are essential. Designed according to IEEE 802.3 standards, the 100G-4WDM-QSFM40KM supports hot-swappable installation, enabling seamless upgrades and maintenance without disrupting network operations. Its energy-efficient design reduces power consumption, contributing to lower operational expenses. The QSFM form factor offers a compact, high-density solution that fits easily into modern network equipment racks. By delivering low latency and reliable transmission across 40 kilometers, this transceiver enhances network scalability and performance for service providers, data centers, and enterprises handling large volumes of data traffic over metropolitan and regional areas.