R&D Internship – Improving and Characterizing a Point-to-Point Free-Space Optical Link F/H

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Published on 22/10/2026

  • Contract type:  Internship - 6 months

  • Work time:  Full time

  • Location Rennes

The company

Founded in 2013, Cailabs designs, manufactures, and develops innovative photonic solutions for the space, industry, telecommunications, and defense sectors. A global specialist in laser shaping, the company has accelerated its growth in the space field with turnkey optical ground stations that integrate atmospheric turbulence compensation technology. This makes it one of the first companies to harness very high data rates enabled by optics in a commercial ground station.

Cailabs currently has more than 200 employees, including 41PhDs. With 29 patent families filed, the company is one of the most innovative companies in France. It is headquartered in Rennes, with offices in Paris and Washington (USA).

Post description

Free-space optical communications enable high-speed point-to-point links using highly directional beams. The TILBA®-LOS product addresses this challenge by combining optical performance, pointing accuracy, and physical link security.

You will work within the technical team, under the supervision of one or more optical R&D engineers. The internship aims to study, implement, and characterize solutions to improve the setup, stability, and performance of a point-to-point free-space optical link.

The work may cover various aspects of a free-space optical communication system, including:

  • Performance characterization and correlation with meteorological data.
  • Experimental implementation and validation.
  • Development of test setups.
  • Data analysis and processing.
  • Investigation of solutions to improve system performance and robustness.

This internship has a strong experimental focus, complemented by numerical data processing. It will give you the opportunity to work on a complete photonic system, from test preparation through to the interpretation and presentation of results.

Profile required

 
 

Key skills:

  • Currently enrolled in an engineering school or Master’s degree, with a specialization in optics, photonics, physics, or instrumentation.
  • Interest in free-space optics and experimental systems.
  • Enjoy conducting tests, analyzing data, and solving technical problems.

Nice to have:

  • Knowledge of Python and commonly used data-processing libraries.
  • Basic knowledge of optical communications and optical detection.
  • Curiosity, rigor, autonomy, and the ability to clearly present technical results.

Environment

  • Innovative, fast-growing company.
  • Young and dynamic team.
  • 35-hour working week, Monday to Friday.

By joining Cailabs, you will find:

  • A dynamic team of engineers and PhD graduates who share your desire to apply their skills to stimulating technical challenges.
  • A collaborative environment and intellectually stimulating work.
  • A cutting-edge technology company, working from prototype development through to industrialization.
  • Opportunities to connect and share with colleagues, a modern and pleasant working environment, and meal vouchers.

Joining Cailabs means you will receive the support you need to develop new skills.

More information: www.cailabs.com

Réf: 5c4eba6d-32a9-458a-8801-172595647416

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R&D Internship – Improving and Characterizing a Point-to-Point Free-Space Optical Link F/H

Internship - 6 months
Full time
Rennes

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Unless otherwise requested, your data is retained for a maximum of 2 years.

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Regarding your rights:

In accordance with the GDPR, you have the right to access, rectify, object to and delete your data. You may exercise these rights by contacting dpo@septeo.com.

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