Optical Interconnect

A high-speed communication link that uses light instead of electrical signals to transmit data between chips or systems.

An optical interconnect is a high-speed communication link that transmits data using light waves (photons) through optical fibers or waveguides, rather than traditional copper wires (electrons). This technology is deployed at various scales, ranging from long-distance telecommunications to connections between servers in a data center, and increasingly down to the chip-to-chip level. By replacing electrical signals with light, optical interconnects bypass the physical limitations of copper, which suffers from severe signal degradation, heat generation, and latency at higher speeds. In the market, optical interconnects are observed through the adoption of optical transceivers, silicon photonics, and co-packaged optics by hyperscalers and semiconductor manufacturers. Investors track the technology's integration into high-performance computing architectures, particularly artificial intelligence data centers where massive parallel processing requires ultra-fast data transfer between thousands of GPUs and memory clusters. For retail investors, companies designing or manufacturing optical components represent high-growth opportunities within the hardware infrastructure sector. However, key pitfalls include high capital intensity, rapid technological obsolescence, and the risk of double-ordering by hardware customers during supply shortages, which can artificially inflate short-term demand signals.

A data center operator replaces 10,000 copper cables with optical interconnects. Each copper cable consumes 10 watts of power and supports 100 Gbps of bandwidth. The new optical interconnects consume only 3 watts of power per link while supporting 400 Gbps of bandwidth. This upgrades total bandwidth from 1,000,000 Gbps (10,000 100) to 4,000,000 Gbps (10,000 400), a 4x increase, while reducing total interconnect power consumption from 100,000 watts (10,000 10) to 30,000 watts (10,000 3), a 70% energy savings.