May 12 2025
Overview of 400G DR4, FR4, LR4, and SR8 QSFP-DD Optical Transceivers
Core technologies include:
Advanced modulation: PAM4 (4-level pulse amplitude modulation) for higher spectral efficiency.
Wavelength multiplexing: DWDM (Dense Wavelength Division Multiplexing) to increase capacity via parallel lanes.
High-performance DSP: Compensates for signal impairments and improves SNR.
Silicon photonics: Enables lower power consumption and cost through integration.
