Preprint Review Version 1 Preserved in Portico This version is not peer-reviewed

Reflection Mirrors, Optical Gyroscopes, Filters, and Wavelength Interleavers Based on Sagnac Interference in Integrated Photonics

Version 1 : Received: 17 January 2023 / Approved: 18 January 2023 / Online: 18 January 2023 (10:26:50 CET)

How to cite: Moss, D. Reflection Mirrors, Optical Gyroscopes, Filters, and Wavelength Interleavers Based on Sagnac Interference in Integrated Photonics. Preprints 2023, 2023010336. https://doi.org/10.20944/preprints202301.0336.v1 Moss, D. Reflection Mirrors, Optical Gyroscopes, Filters, and Wavelength Interleavers Based on Sagnac Interference in Integrated Photonics. Preprints 2023, 2023010336. https://doi.org/10.20944/preprints202301.0336.v1

Abstract

As a fundamental optical approach to interferometry, Sagnac interference has been widely used for reflection manipulation, precision measurements, and spectral engineering in optical systems. Compared to other interferometry configurations, it offers attractive advantages by yielding a reduced system complexity without the need for phase control between different pathways, thus offering a high degree of stability against external disturbance and a low wavelength dependence. The advance of integration fabrication techniques has enabled chip-scale Sagnac interferometers with greatly reduced footprint and improved scalability compared to more conventional approaches implemented by spatial light or optical fiber devices. This facilitates a variety of integrated photonic devices with bidirectional light propagation, showing new features and capabilities compared to unidirectional-light-propagation devices such as Mach-Zehnder interferometers (MZIs) and ring resonators (RRs). Here, we present our latest results for functional integrated photonic devices based on Sagnac interference. We outline the theory of integrated Sagnac interference devices with comparisons to other integrated photonic building blocks such as MZIs, RRs, photonic crystal cavities, and Bragg gratings. We present our latest results for Sagnac interference devices realized in integrated photonic chips, including reflection mirrors, optical gyroscopes, basic filters, wavelength (de)interleavers, and optical analogues of quantum physics.

Keywords

Optical interferometers; Sagnac interference; integrated photonics

Subject

Physical Sciences, Optics and Photonics

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