Thin-Film Lithium Niobate Foundry Services by CSEM

CSEM supports the photonic community with various services based on its standardized TFLN PIC platform, dependable process design kit (PDK) and a 150 mm wafer-scale fabrication process, which includes PIC design, manufacturing, and testing.

Photonic Integrated Circuits (PICs) manufactured in 150 mm wafer-scale process.© CSEM

CSEM is at the forefront of introducing an open-access foundry service for standardized TFLN PICs (Thin-Film Lithium Niobate on Insulator Photonic Integrated Circuits), designed specifically for prototyping, and research and development. The distinctive features of this service include a unique combination of three device layers, two metallization steps, cladding, back-end-of-line opening steps, and seamless chip facets integrated into a monolithic PIC platform.

This integration opens up a myriad of possibilities for intricate PIC designs, as well as hybrid and heterogeneous integration. Moreover, it facilitates easy electrical and packaging interfacing.

Our state-of-the-art technology and expertise in the PIC domain ensure superior quality and performance for applications in telecommunications, data centers, quantum, and beyond. Partner with CSEM to leverage the potential of TFLN in your innovative projects.

Process Design Kit (PDK) C-band building blocks

Process design kit for TFLN PICs

CSEM TFLN PIC foundry services is supported by a dependable process design kit (PDK) at telecommunication C-band. The PDK encompasses a set of active and passive building blocks, technology layers and design guide documentation.

Furthermore CSEM provides the PIC designer with parametric cells (PCell) for the building blocks which enables the designer to turn the standardized components to customized ones (in compliance with the fabrication design rules), easing the layouting and circuity of the customized PICs.

CSEM’s PDK is now available at LUCEDA.

LUCEDA Photonics Logo
Multiple 5x5 mm² chips fabricated on CSEM's TFLN PIC platform.

Why work with us

  • MPW and custom RUNs (3-4 RUNs / year)
  • Extensive library of standardized building blocks
  • Expert check and consultation
  • Design rule check (DRC)
  • Design, simulation, layout, and characterization services
  • ISO9001-certified 150 mm wafer foundry
  • Independent and innovative foundry located in the heart of Europe
  • High level of confidentiality 

Current offerings for thin-film lithium niobate PICs

CSEM's TFLN PIC foundry service covers the need in design, manufacturing, and testing.

Schedule of the MPW RUNs

We support a robust MPW life cycle by assisting photonic designers at every stage of mask preparation. This includes systematic DRC during design submission and functional-level consulting, as well as advice to optimize PIC designs.

Full stack MPW

CSEM’s TFLN PIC full-stack MPW RUNs calendar.

Fast MPW

CSEM’s TFLN PIC fast MPW RUNs calendar.

Take the next step in your photonics journey

Reach out to us for a consultation and discover how we can tailor solutions to meet your specific needs.

Check out our flagship EU projects!

Meet our happy customers

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Mikkel Heuck

Research Scientist Quantum Photonics Laboratory

We are strong supporters of CSEM’s efforts to build up a foundry service for lithium niobate integrated photonics since we believe it will have a major impact on both industry and the scientific community. It is really a fortunate situation for us to get in early and work with CSEM as their capabilities expand and accelerate our research in integrated quantum photonics.

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Richard Phelan

Head of laser design

We’ve had several projects with CSEM, which have advanced our semiconductor laser products substantially and opened up new commercial opportunities in the area of low linewidth lasers for lidar applications. The discussions with the experts at CSEM have provided us with many new ideas as well as valuable feedback for different applications such as metrology and sensing.

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Augustinas Vizbaras


CSEM has a fantastic understanding and knowledge of using optical systems to measure vital signs, and bringing this know-how into our use case has allowed us to make huge improvements in our OptiBP software—and potentially in the global management of hypertension.