Linear Pluggable Optics (LPO)—a design approach that eliminates the DSP (Digital Signal Processor) chip from optical transceivers in favor of linear amplifiers—emerged in 2024 as one of the industry's most debated and potentially disruptive technologies.
The LPO concept is straightforward but technically ambitious:
• Traditional optical transceivers use DSP chips for signal conditioning, equalization, and error correction. These chips are among the most expensive components in a module and consume significant power.
• LPO replaces the DSP with lower-cost, lower-power linear amplifiers, shifting the signal processing burden to the host switch ASIC.
• The potential benefits are compelling: 20–30% cost reduction and 30–50% power savings per module.
However, LPO faces significant challenges:
• Interoperability: Without DSP-based signal conditioning, ensuring consistent performance across different switch-module combinations requires careful system-level engineering.
• Reach limitations: LPO modules typically support shorter distances than DSP-based equivalents, limiting their applicability in some network architectures.
• Standardization: No formal MSA specification exists yet, leading to concerns about vendor lock-in.
