The optical module provides point-to-point 400 Gigabit Ethernet links over eight pairs of multimode fiber, with a reach of up to 100 m for OM4 (MMF) and 70 m for OM3 (MMF). 400 Gigabit Ethernet (400G) transceivers are optical modules capable of handling data rates of 400 Gbps. 400G. PAM4 (4-Level Pulse Amplitude Modulation): This is the predominant modulation technique used in 400G modules. Multi-Mode Fiber (MMF):. This paper covers the persuasive aspects of the 400g transceivers with particular reference to the Quad Small Form Factor Pluggable Double Density (QSFP-DD) and other optoelectronics. These devices are typically used with VCSEL lasers and Photodectors for optical transmission over multi-mode fiber.
