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Photonics Integrated Circuits based on Optical Frequency Combs

Technological challenge: Photonics, Imaging and displays (learn more)

Department: Département d'Optronique (LETI)

Laboratory: Laboratoire d'Intégration Photonique sur Silicium

Start Date: 01-09-2022

Location: Grenoble

CEA Code: SL-DRT-22-0676

Contact: leopold.virot@cea.fr

Optical frequency comb (OFC) generation has been widely studied in the past decades mainly for timing and clocks as well as for spectrometry. However, the possibility to generate OFC on chip with low power consumption is opening new fields of application such as telecommunication, LIDAR, sensing, quantum photonics? Silicon nitride (SiN) has proven to be an exceptional platform for generating OFC based on micro-resonators thanks to its non-linear properties and ultra low propagation losses. For optical communications, such OFC allows to reach Wavelength Division Multiplexing (WDM) transmission data streams of tens of Tbit/s with reduced footprint thanks to photonics integrated circuits. However, the integration of active devices for pump source, modulation and detection in a monolithic way is still challenging and further developments are needed. This thesis aims to develop new OFC based circuits using CEA-Leti ultra low loss SiN platform. The student will be in charge of the design and optimization of the microcomb generation using SiN mircoresonators, as well as of the integration of the MUX/DEMUX for WDM. He will also be involved in the fabrication and process development, in order to integrate on chip active functions such as modulation and/or detection based on an additional Silicon layer. Finally, the candidate will be in charge of the setup and characterization of the developed photonics circuits.

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