Optical interconnect scaling is moving beyond the old semiconductor logic of simply shrinking one building block and getting more performance as a result. According to the EDN analysis, future bandwidth growth for AIartificial intelligence and HPC1. High Performance ComputingCompute applications with particularly high performance demands, cited here as a driver for packaging and testing.2. high-performance computingHPC denotes compute-intensive chips that require advanced testing support. links will increasingly depend on combining several scaling mechanisms at once, because no single optical dimension can keep up on its own.
The most obvious route remains higher serial rate, but that quickly tightens the entire link budget. Electrical insertion loss becomes harder to manage, jitter margins shrink, and equalization grows more aggressive. Modulators need more bandwidth, photodetectors must respond faster, and preserving signal-to-noise margin becomes more difficult. The result is higher DSP1. differential signal processingSignal processing based on differences between two signals, often rejecting common interference.2. digital signal processing complexity, more power, and greater thermal density.
When faster lanes stop being economical, the next lever is parallelism. More channels, more wavelengths, and eventually more spatial paths can all raise aggregate throughput. Wavelength-division multiplexing lets multiple carriers share one fiber or waveguide, but it also imposes stricter requirements on lasers, filters, and resonant structures. Temperature drift, process variation, control, and calibration become part of the bandwidth equation, and test complexity rises with channel count.
Physical parallelism brings its own constraints. Additional fibers, fiber arrays, waveguides, multicore fiber, and spatial-division multiplexing can boost capacity, but alignment becomes more demanding, connector density increases, and fiber attach and package escape get harder. Assembly tolerances tighten, yield becomes more sensitive, and each optical path adds another point of failure or variation.
When raw channel quality is still not enough, higher-order modulation, DSP1. differential signal processingSignal processing based on differences between two signals, often rejecting common interference.2. digital signal processing, coding, and forward error correction can extend reach and throughput. Yet these techniques move complexity into electronics, power delivery, thermal management, and characterization. As optics move closer to compute, the package becomes part of the scaling strategy: it sets electrical reach, optical access, thermal conditions, mechanical stability, and much of the manufacturability of the link. The article’s core point is that optical bandwidth is no longer defined by a single device metric. It is determined by whether the optical, electrical, thermal, mechanical, packaging, and manufacturing pieces can all work together in one realizable system.