Comprehensive technical analysis of latency in coherent optical systems — propagation physics, component contributions, application budgets, and a live latency calculator. nd Latency variation are very important in applications requiring accurate timing (e (PAM-4 or Coherent), require complex digital signal processors (DSPs) in optic itional EEPROM data content for propagation del ss C. 2” pluggable : 2% of the cTE budget ITU-T G. 20”. 112G EML: Enabling the next generation of cloud & AI using 800Gb/s optical modules., Aquila: A unified, low-latency fabric for datacenter networks, NSDI'22., Low Power DSP-Based Transceivers for Data Center Optical Fiber Communications (Invited Tutorial), JLT. Latency is a term that is used to describe a time delay in a transmission medium such as a vacuum, air, or a fiber optic waveguide. In free space, light travels at 299,792,458 meters per second. 6T/800G optical modules have become core components of data centers and communication networks due to their ultra-high bandwidth and low-latency characteristics. At its core, latency refers to the time delay experienced in a system—in this context, the delay from the moment data is sent to when it.