In the world of AI data centers, electricity costs are an expense that cannot be overlooked. A training cluster containing tens of thousands of GPUs can consume millions of kilowatt-hours of electricity annually just to power its optical modules. When a data center expands from a few thousand modules to hundreds of thousands, saving just a few watts per module can translate into millions of dollars in cumulative electricity cost savings.
This is the central reason why LPO technology has attracted widespread industry attention.
LPO, or Linear Pluggable Optics, is based on a relatively straightforward principle: it removes the digital signal processor (DSP) chip from inside the optical module and shifts signal processing responsibilities to the switch ASIC. Although this architectural change may appear simple, its impact can be substantial. For an 800G module, for example, an LPO implementation can reduce power consumption by approximately 50%. Eoptolink's 800G LPO modules have reportedly secured orders from major customers, including Meta and Amazon, providing an indication of growing market acceptance of the technology.
However, the significance of LPO extends far beyond energy savings. More importantly, it is redefining how the industry measures performance per watt in data centers. In AI training clusters, GPU utilization directly affects the return on computing infrastructure investment. If optical interconnects create thermal bottlenecks because of excessive power consumption, the resulting heat may trigger protective clock throttling, reducing GPU utilization. By lowering optical module power consumption, LPO frees up thermal headroom and can indirectly improve the ability of GPUs to sustain high-performance operation. For data centers running large-scale AI clusters, this indirect benefit may be even more valuable than the electricity savings themselves.
Centera Photonics' announcement of a 1.6 Tbps DR8 LPO module at OFC 2026 marked a further step in the evolution of LPO technology toward the 1.6T era. The module features a photonic integrated circuit (PIC) incorporating lasers and modulators, paired with an OSPic optical signal processor to achieve 1.6 Tbps transmission within an ultra-low-power architecture. At the launch, a NewPhotonics executive commented, "We are witnessing 1.6T LPO maturing among hyperscale cloud providers that prioritize energy efficiency and scalable optical architectures."
Nevertheless, the broader adoption of LPO technology is not without challenges. Interoperability is one of the most significant concerns. Because LPO modules eliminate the DSP chip, signal processing responsibilities shift toward the switch, requiring closer coordination between the switch and the optical module. Support for LPO varies among switch vendors, and interoperability testing can be more complex than it is for conventional DSP-based modules. Before selecting LPO modules, buyers should confirm compatibility with their existing switch platforms. Ideally, they should require suppliers to provide actual test data demonstrating performance on the specific switch models they intend to deploy.
Operational convenience is another important consideration. Traditional DSP-based modules offer adaptive equalization, which generally provides greater tolerance for variations in fiber-link conditions. LPO modules offer less flexibility in this regard and place greater demands on link quality. Consequently, deploying LPO may require more rigorous testing and certification of fiber links. On the other hand, this requirement can encourage earlier identification of potential link issues, helping prevent hidden problems from developing into performance failures at critical moments.
For overseas buyers evaluating LPO modules, several dimensions deserve particular attention. First, examine measured power consumption rather than relying solely on suppliers' nominal specifications. Request power consumption curves covering the actual operating temperature range. Second, validate interoperability by asking suppliers for compatibility test reports covering your specific switch brand and model. Third, assess the completeness of operational documentation. Troubleshooting procedures for LPO modules differ from those used for conventional DSP-based modules, so buyers should ensure that suppliers can provide clear technical documentation, troubleshooting guidance, and training resources.
From a market perspective, LPO modules are expected to account for an estimated 15% of optical module market revenue, making them an important growth segment. This share could increase further as 1.6T LPO modules enter mass production. For buyers planning the next generation of AI data center architectures, LPO is no longer a technology that can be overlooked. It is a strategic option that deserves serious evaluation.
When selecting an LPO supplier, buyers should pay particular attention to its silicon photonics integration capabilities. LPO technology has natural synergies with silicon photonics: the high level of integration offered by silicon photonics can reduce the number of internal components in an optical module, further lowering power consumption and packaging complexity. Suppliers that combine in-house silicon photonics chip development capabilities with proven experience in LPO module mass production are likely to be among the most valuable partners in the 1.6T era.
