A 100G optical module is a high-speed optical transceiver that is capable of transmitting data at a rate of 100 gigabits per second. QSFP 100G DR is specifically designed to provide high-speed transmission over single-mode fiber while maintaining simple deployment and excellent scalability. Compared with older 100G technologies, it offers lower power consumption, reduced fiber complexity, and easier upgrades. Moreover, as data. QSFP28 is the main form factor for 100G optical modules. This article reviews QSFP28 module types and key WDM technologies like CWDM and DWDM. This functionality allows a single high-speed port to serve multiple lower-speed devices, improving network flexibility. With today's 100G optics, we're at the point where it now influences your network hardware cost and fiber infrastructure design.