A CPO (Co-Packaged Optics) optical module combines multiple photonic components—such as lasers, modulators, and photodetectors—with electronic drivers and transimpedance amplifiers (TIAs) into a single tightly integrated package that sits directly alongside or on the same substrate as a switching or routing ASIC . Unlike a conventional pluggable optical transceiver, which is a discrete, hot-swappable unit, a CPO module is designed for co-location with the ASIC, dramatically shortening the electrical signal paths and improving bandwidth, latency, and power efficiency .
While a chip typically refers to a single semiconductor die performing a specific function, a CPO module is a heterogeneous assembly. It includes multiple chips (ASICs, driver ICs, and photonic dies) and optical elements packaged together on a substrate or interposer. This integration allows the module to function as a high-speed optical engine but does not make it a single semiconductor device .
In short, a CPO optical module is an integrated system rather than a single chip. It merges multiple photonic and electronic components with a switch ASIC to create a compact, high-performance optical engine for data centers and high-performance computing environments .
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