Silicon photonics is a way to build compact optical circuits on a silicon-based chip using semiconductor manufacturing methods. In a typical data link, electronics encode data onto laser light, a photonic circuit guides and shapes that light, fiber carries it to another device, and a photodetector converts it back into an electrical signal.
What is silicon photonics?
Silicon photonics integrates optical functions—such as guiding, splitting, filtering, modulating, and detecting light—into a photonic integrated circuit (PIC). The silicon platform draws on processes and manufacturing expertise developed for microelectronics, making it possible to place multiple optical components in a compact circuit and produce them at scale. A 2024 review describes silicon photonics as one of the mainstream approaches to photonic integration, citing scalable manufacturability as a key advantage: Nature Photonics review (2024).
It does not mean that light replaces all electronics, or that every component is made from silicon. A transceiver combines photonic components with electronic circuitry, and product designs can use additional materials or separate parts where they perform better.
How does a silicon photonics link work?
A common example is an optical link between data-center equipment. Its job is to turn an electrical data stream into light, send that light through fiber, and recover the data at the far end.
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- A laser supplies light. The source provides continuous or pulsed optical light. Silicon is a poor light emitter, so the laser may be a separate component or integrated through hybrid or heterogeneous methods.
- Electronics encode the data. Driver circuitry controls an optical modulator, which changes a property of the light—commonly its intensity or phase—to represent the data.
- The photonic circuit routes and shapes the light. High-index-contrast waveguides confine light on the chip. Other elements can split or combine paths, filter wavelengths, or multiplex multiple optical channels.
- A coupler transfers light to fiber. The fiber carries the optical signal between equipment.
- The receiver converts light back into an electrical signal. A photodetector produces electrical current from the received light; receiver electronics amplify and process it.
The photonic integrated circuit may combine waveguides, modulators, and photodetection, while associated electronics provide functions such as laser driving and transimpedance amplification. The exact division of components varies by product: a laser may be on the photonic die or supplied separately, and not every chip integrates every transceiver function. See STMicroelectronics’ silicon photonics overview.
Why use silicon—and what are its limitations?
Manufacturing and integration
Silicon photonics can draw on semiconductor manufacturing infrastructure and know-how. Integrating multiple optical functions on one circuit can also reduce the need to assemble a system from many separate optical components. Those advantages make dense circuits and high-volume production plausible, although they do not guarantee that every design will be cheaper, simpler, or more efficient than alternatives.
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- Silicon Photonics Design From Devices to Systems
Light generation and modulation tradeoffs
Silicon’s indirect bandgap makes efficient light emission difficult, so practical designs generally handle lasers through an external source or hybrid integration. Its centrosymmetric crystal structure also lacks the second-order nonlinearity used for some electro-optic effects. As a result, other materials may suit particular functions better: III–V semiconductors for lasers, for example, or lithium niobate for some high-performance modulation needs. Silicon photonics is best understood as an integration platform, not as a claim that silicon is the ideal material for every optical component.
Where is silicon photonics used?
Established use: data-center and network transceivers
Optical transceivers carry data between servers, switches, and other network equipment. This is the clearest established commercial use of silicon photonics. Intel reports that its platform has shipped more than 8 million photonic integrated circuits and more than 32 million integrated lasers in pluggable data-center transceivers since 2016. These are Intel’s cumulative company figures, not an independently audited industry-wide total; see Intel Silicon Photonics.
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Transitioning architectures: near-packaged and co-packaged optics
These approaches move optical conversion closer to a processor or switch than a removable front-panel module does. The goal is to reduce the distance high-speed electrical signals travel on a board and to support greater bandwidth density. The tradeoff is greater reliance on packaging, fiber attachment, thermal design, manufacturing, and testing choices.
| Architecture | Optical engine placement | Main tradeoff |
|---|---|---|
| Pluggable optics | Removable module at the equipment front panel | Modularity and ease of deployment; the electrical path to the host remains longer. |
| Near-packaged optics (NPO) | On the board, closer to the processor | Shorter electrical path and potential for greater density, with tighter integration into the host board. |
| Co-packaged optics (CPO) | On the same package substrate as a processor or switch | Targets shorter electrical paths and high density, while making packaging, fiber attachment, testing, and serviceability important design challenges. |
Pluggable modules are an established deployment model; near-packaged and co-packaged optics are transition or next-generation architectures rather than interchangeable descriptions of the same maturity level. Vendor roadmaps and demonstrations should not be read as proof that all systems have moved to CPO. GlobalFoundries describes silicon photonics manufacturing, design kits, reference flows, packaging, and test capabilities on its silicon photonics platform page; ST also discusses its platform roadmap in its product information.
Developing areas: sensing and computing
Research and development also covers photonic signal processing, biosensing, lidar, and optical links for computing systems. A 2024 perspective discusses these directions alongside ongoing integration, fabrication, and packaging challenges: Nature Communications perspective (2024). Their maturity varies; they should be described as active development areas, not as universally deployed silicon-photonics products.
What the headline numbers do—and do not—tell you
- More than 8 million PICs and more than 32 million integrated lasers since 2016: Intel’s cumulative platform shipment claim, accessed in 2026. It does not establish total industry shipments.
- 800 Gb/s to 1.6 Tb/s: STMicroelectronics’ stated range for optical modules supported by its PIC100 platform. It is a platform specification, not a promise that every link or system delivers that rate.
- Silicon modulators for data lanes beyond 300 Gb/s: a technology advance reported by authors of a 2024 review. It is not a universal deployed lane rate.
The cited material does not establish a neutral, current industry-wide market size or audited shipment total. For that reason, company shipment figures and product specifications are useful examples of adoption and capability, but should remain attributed to their respective vendors.
How to compare optical designs
When comparing a pluggable module with a near-packaged or co-packaged design, the placement of the optical engine is only one part of the decision. Consider the system-level tradeoffs:
- Electrical path length: moving conversion nearer the processor can shorten high-speed electrical connections.
- Bandwidth density and power: these are key design goals, but actual outcomes depend on the product and system rather than the architecture label alone.
- Modularity and serviceability: removable modules are easier to swap independently; tighter integration changes how components are accessed and replaced.
- Packaging and fiber attachment: closer integration raises the importance of thermal management, reliable fiber connections, test methods, and manufacturing yield.
Vendor performance claims describe particular platforms. They do not by themselves establish the performance, power consumption, or serviceability of every system built with that architecture.
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