| Parameter | CP Megalink | PCIe Gen6 (x16) | InfiniBand NDR | |-----------|-------------|----------------|----------------| | Data rate per link | 800 Gb/s | 256 Gb/s | 400 Gb/s | | Link power efficiency | 5 pJ/bit | 18 pJ/bit | 12 pJ/bit | | Max cable length (optical) | 2 km | 1 m (copper) | 500 m (active optical) | | Latency (switch to switch) | 85 ns | 350 ns (with retimers) | 130 ns | | Bit error rate (raw) | 10^-15 | 10^-12 | 10^-15 |
Energy savings: At 51.2 Tb/s aggregate, CP Megalink consumes ~256 W for optics, versus ~921 W for equivalent electrical SerDes (36 pJ/bit typical). cp megalink
To understand the phrase, one must first dissect its two components: "CP" and "Megalink." | Parameter | CP Megalink | PCIe Gen6
Abstract
As artificial intelligence models scale beyond trillions of parameters, traditional electrical interconnects face insurmountable bandwidth, power, and latency constraints. CP Megalink (Co-Packaged Megalink) is an optical interconnect architecture that integrates dense wavelength-division multiplexing (DWDM) photonic engines directly inside the switch package. This paper details the physical layer design, power efficiency (≤5 pJ/bit), aggregate bandwidth (51.2 Tb/s per switch), and fabric latency (sub-100 ns per hop). Comparative analysis against PCIe Gen6 and InfiniBand NDR shows a 3.2× improvement in effective bandwidth density. We further evaluate reliability under thermal stress and present a scaling roadmap toward 400 Tb/s by 2028. This paper details the physical layer design, power