Photonic integrated circuits (PICs) have attracted great attention as promising platforms for high-data-rate communications and high-performance computing. For the PICs, photonic devices with compatible materials, compact footprint, high-performance, and sophisticated functionalities are necessary building blocks. Design optimization to implement such devices for target applications and requirements are of critical importance. In this respect, inverse design methods, including iterative optimizations and deep neural networks, have demonstrated significant advantages over the traditional simulation-based trial-and-error optimization approach. We provide an overview of the recent progress on the inverse designs for the integrated photonic devices. The principles and procedure of the inverse design methods are presented and discussed, followed by a summary of the methods employed for specific integrated photonic devices in different integrated photonics material platforms. Finally, topics of future applications and fabrication constraints for the inverse design methods are discussed.
We propose and demonstrate a feedback tunable self-injection locked (SIL) narrow linewidth laser, the feedback light intensity is dynamically adjusted to find the best locking state. The self-injection locked laser is composed of distributed feedback (DFB) semiconductor laser and high quality (Q) factor silicon nitride (SiN) external cavity, tunable sagnac loop reflector is used to achieve arbitrary ratio of feedback light and output light on the basis of add-drop type high Q microring resonator (MRR). The results show that the SIL state is closely related to the ratio of feedback light. When the optical feedback ratio is higher than -14 dB, a robust SIL state can be achieved, and the locking state is independent of the phase of the feedback light, the intrinsic linewidth is narrowed from 130 kHz to 1 kHz. By optimizing the ratio of feedback light to -9.3 dB, a narrow linewidth output of 345 Hz can be achieved. This work has important application value in the field of coherent laser communication and coherent detection.
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