CPO phases out optical modules

CPO (co-packaged optics) is gradually replacing traditional pluggable optical modules in high-performance and hyperscale networks due to superior bandwidth, power efficiency, and integration benefits.Why CPO is Replacing Pluggable ModulesCPO integrates optical transceivers directly with switch ASICs or processors, eliminating the need for high-speed electrical I/O to external pluggable transceivers. This reduces signal loss, latency, and power consumption while enabling higher port density and faster deployment in data centers . NVIDIA's CPO solutions, for example, demonstrate 3.5x better energy efficiency and 1.3x faster deployment compared to traditional pluggable optics . By shortening the electrical path, CPO also reduces the need for digital signal processors or retimers, further improving efficiency .Current Adoption and Market TimelineWhile CPO offers clear advantages, large-scale deployment is still emerging. Initial commercial trials are expected around 2026, with high-volume manufacturing likely by 2027 . Early adoption is focused on scale-up AI networks where copper interconnects are currently limiting performance, and later expansion into scale-out optical networks is anticipated as speeds reach 400G per lane . Early deployments are often proprietary, allowing vendors to innovate before standardization .Challenges and ConsiderationsDespite its benefits, CPO introduces serviceability and interoperability challenges. Embedded optical modules are harder to inspect or replace, and failed ports can reduce switch throughput . Additionally, CPO requires careful system design, testing, and support, and standards are still maturing . Some industry leaders, like Arista, continue to advocate for Linear Pluggable Optics (LPOs) in certain applications due to configurability and easier maintenance .OutlookOver the next 5–10 years, CPO is expected to gradually cannibalize pluggable optics in high-speed, high-density networks, particularly in AI and hyperscale data centers . However, pluggable modules will remain relevant in lower-speed or less dense deployments, ensuring a transitional period where both technologies coexist. Organizations planning network upgrades should monitor CPO developments to optimize for energy efficiency, bandwidth, and future scalability.