{"id":20757,"date":"2026-11-03T08:36:03","date_gmt":"2026-11-03T08:36:03","guid":{"rendered":"https:\/\/www.fibermall.com\/blog\/?p=20757"},"modified":"2026-11-03T08:41:44","modified_gmt":"2026-11-03T08:41:44","slug":"400g-per-lane-the-next-optical-signaling-generation-explained","status":"publish","type":"post","link":"https:\/\/www.fibermall.com\/blog\/400g-per-lane.htm","title":{"rendered":"400G per Lane: The Next Optical Signaling Generation, Explained"},"content":{"rendered":"\n
400G per lane refers to a nominal data rate of 400 gigabits per second (Gb\/s) carried by a single electrical lane or optical data channel, depending on the interface being discussed. It represents the next step beyond the 200G-per-lane signaling used in 1.6T-class modules. For electrical interfaces, the industry often discusses a 448 Gb\/s gross signaling rate. If PAM4 is used, this corresponds to approximately 224 GBaud. However, the final modulation and coding choices for 448G interfaces are still under development. This technology could help scale optical modules from 1.6T to 3.2T and eventually to 6.4T and beyond.<\/p>\n\n\n\n
Here’s why the number matters. Optical module capacity is generally calculated by multiplying the number of lanes by the data rate per lane. A 1.6T OSFP module, for example, can use eight host-side electrical lanes operating at 200G each. A future 3.2T architecture could use the same number of electrical lanes at 400G each. This would double aggregate bandwidth without increasing the electrical lane count. However, it would not necessarily keep the same fiber count: that depends on the optical interface and how its channels are implemented.<\/p>\n\n\n\n