Development of an integrated miniature optical isolator

PROJECT COST:

571 840 $

PRIMA CONTRIBUTION:

259 840 $

PROJECT DETAILS:

Optical isolators are critical components in high-performance optical systems, including coherent transceivers and LiDARs, as they prevent parasitic back-reflections that can destabilize or degrade laser sources. Among the various isolator technologies, those based on Faraday rotation—a manifestation of the magneto-optical effect—are the most prevalent due to their high isolation ratios and broad wavelength compatibility. However, conventional Faraday isolators rely on bulky components such as permanent magnets and collimating lenses, which preclude their integration into compact photonic integrated circuits (PICs).

In a previous collaborative research initiative between Professor Réal Vallée and AEPONYX, supported by the ENCQOR program, a novel laser-based technique was developed to directly inscribe optical waveguides into magneto-optical materials, specifically ferromagnetic garnets. This method eliminates the need for external magnets and lens systems, marking a significant step toward the miniaturization of optical isolators compatible with PIC platforms. While a proof of concept was successfully demonstrated, several scientific and technological challenges remain before this approach can be translated into a robust, manufacturable device.

The present project aims to address these outstanding issues by advancing the laser-assisted assembly of a fully integrated, miniaturized optical isolator prototype. Key research objectives include:

Optimization of waveguide inscription in magneto-optic substrates
Mechanical and optical integration of the isolator with silicon-based photonic circuits
Long-term stability and environmental robustness under operational conditions

The successful realization of this device will enable AEPONYX to expand its product portfolio to include integrated optical isolators suitable for a wide range of photonic applications, both fiber-based and chip-scale. This innovation holds potential for early adoption in emerging technologies, with a clear pathway toward implementation in established optical communication systems.

In addition to its technological impact, the project includes a strong training component, involving the supervision of one PhD. student, two master’s students, and two undergraduate interns, thereby contributing to workforce development in advanced photonic technologies.