Stabilization of integrated photonic resonator device

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Name of the Speaker: Pawan Kumar Pandit (EE19D018)
Guide: Dr. Bijoy Krishna Das
Venue: ESB-234 (Malaviya Hall)
Date/Time: 15th December 2022 (Thursday), 3:00 PM

Integrated photonic devices in general work on the basis of precise phase control of guided mode(s). Especially, waveguides fabricated in silicon photonics platform suffer from fabrication imperfection related phase errors as well as due to thermal phase fluctuations (thermo-optic coefficient ) Such phase error causes serious performance degradation in resonator devices. On the other hand, devices like microring resonator (MRR), MicroDisc resonator (MDR), DBR based Fabry-Perot resonator (FPR) are very much popular in designing versatile functional photonic integrated circuits (PICs) such as high-speed optical transceiver, quantum/neuromorphic photonic processor chip, microwave photonic processor chip etc. These resonator devices are actively reconfigured via thermo-optic and/or electro-optic effects. It is also observed that typical thermo-optic drift (due to ambient temperature fluctuation and thermal cross-talk) of resonance wavelengths is in the order of 70 which is a big value for high-Q resonators ). Therefore, in a large scale integrated photonic circuit it is really a great challenge to stabilize all the resonator devices independently; global temperature stabilization of entire photonic chip becomes detrimental for their individual reconfigurability (thermo-optic and/or electro-optic).

In this talk, we will discuss first the state-of-the-art techniques for resonance stabilization used in silicon photonic integrated circuits. Afterward, we will present some of our preliminary investigation and scopes for future research in this direction.