- Photonic integrated circuits are transitioning from research to practical use in high-speed data systems
- Recent advancements achieve transmission speeds up to 3.2 Tb/s with dense packaging and multi-channel links
- AI and data centers are major drivers, with ongoing challenges in manufacturing and system integration
Photonic integrated circuits are making their way out of niche research labs and into the spotlight for next-gen data infrastructure. They let optical communication happen not only through fiber optics and separate parts, but also in the semiconductor environment. In practical terms, PIC technology combines separate parts into one chip and enables information to travel as light generated by a laser instead of being transmitted with electrical signals.
This matters because the amount of data transfer driven by AI systems is growing significantly. Recent examples of successful projects involved 3D photonic systems with light transmission rates of 800 Gb/s.
The Role of Photonics in Electronics
Electrical interconnects are effective over a short distance, but as bandwidth increases, so do the losses and power consumption. Copper interconnects also face limitations such as signal attenuation, the resistive component of current, and heating. Photonics helps eliminate these disadvantages by enabling many optical channels and wavelength-division multiplexing.
The growth outlook speaks in favor of this technology. Market Intelo reports that the global photonic integrated circuits market was around $1.5 billion in 2025 and will grow to about $9.1 billion in 2034, representing a CAGR of 22.0%. The growth is tied to increasing demand for high-speed optical connectivity.
Hence, one optical path can transmit multiple data streams. Recent findings achieved a total transmission capacity of 3.2 Tb/s on a chip, with the ability to transmit using 8 channels, including 400 Gb/s on each channel.
Functionality of Photonic Integrated Circuits (PICs)
A PIC operates by receiving electrical signals, transforming them into light signals, directing the light through waveguides, and subsequently converting them back to electrical signals through a photodetector. Silicon is commonly used due to its ability to be processed using dominant CMOS-compatible processes and for producing wafers of a large diameter.
However, the use of different materials, including indium phosphide, silicon nitride, and lithium niobate, allows the creation of what is missing in silicon: light generation or low-loss modulation technologies.
Latest implemented developments in optical technology enabled packing more than 80 optical transmitters and receivers on 0.3 mm². Thus, the system produced a speed of 800 Gb/s with a single channel of 10 Gb/s, demonstrating that many low-speed channels may be combined into a single high-speed channel.
Major Areas of Development
The development of PICs is currently focused on techniques that can produce devices offering better bandwidth performance, as well as lower power consumption, compact size, and ease of production.
Modulators developed in silicon, released in 2025, achieved electro-optical bandwidths of up to 110 gigahertz and transmission speeds of 110 and 130 gigabits per second.
Dense integration: the use of 3D technology has achieved channel density of 5.3 terabits/s/mm², obtaining a power consumption of only 120 fJ/bit of data transmitted.
Packaging: a fan-out wafer-level silicon photonic engine has obtained a transmission rate of 1.79 terabits per second, using 8 channels at 224 Gb/s.
Wavelength scaling: achieved in a recent study involving 8-channel technologies. The performance of achieved technologies is around 3.2 Tb/s, with the transmission capacity of 400 Gb/s for one channel.
It can be concluded that progress is happening at the device, chip, and packaging levels simultaneously.
Recent PIC Developments at a Glance
Development Area Reported Numeric Value Significance 3D photonic interconnect 800 Gb/s Supports high-density chip-to-chip communication Photonic channel count 80 channels Increases aggregate bandwidth through parallel data transfer Channel density 5.3 Tb/s/mm² Demonstrates compact optical integration Wavelength-based transmission 3.2 Tb/s total Shows the potential of multi-channel optical communication Per-wavelength capacity 400 Gb/s Increases bandwidth without adding separate physical links Fan-out photonic packaging 1.79 Tb/s Advances high-bandwidth optical packaging
Recent Trends in Research and AI Technology
A significant advancement in technology is the application of photonics to enhance communications in the AI setup. In one such breakthrough, scientists demonstrated an integration of electronics and photonics in a 2025 study appearing in Nature Photonics, achieving the communication rate of 800 Gb/s across 80 channels.
At the same time, the transmitter and receiver units required 50 fJ and 70 fJ of energy per transmitted bit at 10Gb/s respectively. The area occupied by photonics was 0.3 mm² while the density measured 5.3 Tb/s/mm². As a result, photonic integrated circuits reduce the length of the electrical paths and boost bandwidth capacity by moving the optical conversion process nearer to the processors.
The Rise of Co-Packaged Optics in Data Centers
Co-packaged optics refers to the technology of co-packaging photonic integrated circuits (PICs) and electronics chips (ECs). Instead of placing optical transceivers far from the processor and needing to electrically connect components, CPO allows the optical engine to be integrated into the chip with the switching transistor.
Research has shown that the technology has already produced optical engines operating at speeds of 1.6 Tb/s. Other studies have achieved speeds of 1.79 Tb/s with an additional eight lanes of chips used. Roadmaps in optical communications do not stop at 800 G and 1.6 T speeds.
Engineering Challenges Ahead
Manufacturers of photonic integrated circuits encounter difficulties in manufacturing and system integration. Factors like optical alignment, thermal stabilization, laser integration, packaging yield, and material compatibility can impede the production of PICs. Even temperature shifts of a few Celsius degrees can alter the properties of resonant optical devices and require tuning for proper operation.
Manufacturing also requires a precision level that dictates the use of waveguide structures with dimensions in the order of hundreds of nanometers.
Development for the Future
The development of photonic integrated circuits has established them as a bridge between electronics and optical communication. The latest achievements indicate the ability of these circuits to use chip-level capacity of up to 3.2 Tb/s, create dense links at a speed of 800 Gb/s, and deliver up to 400 Gb/s per wavelength with tens of femtojoules of energy expenditure per bit.
The next stage will determine the integration of lasers, photonics, electronics, and thermal management into packages suitable for mass production. As the requirement of AI, data centers, sensing, and communication increases, it can be expected that PICs will be used to work with light in future electronic systems.
Takeaways
- - PICs are moving from research into practical electronics and mobile-style high-speed infrastructure.
- - Their main value is helping data move faster with less heat and lower power than copper-based links.
- - Progress is happening across sourcing, device design, packaging, and system integration at the same time.
- - AI and data centers are likely to keep driving demand for higher-bandwidth optical solutions.
- - The biggest challenge ahead is scaling production while keeping performance stable and cost-effective.
Disclaimer: This article may have been created with AI assistance and reviewed by our editorial team. It is provided for general informational purposes only. Readers should verify information independently before relying on this content.
