This invention relates to integrated photonic devices for wavelength division multiplexing (WDM). The architecture implements an array of Fabry-Perot cavities formed using Sagnac loop reflectors as mirrors. Each cavity is side-coupled to a waveguide that carries a broadband optical signal, which ultimately enables multi-channel WDM operation. Background: The growing demand for high-speed data transmission and bandwidth efficiency has driven the need for reliable wavelength management solutions. Traditional wavelength division multiplexing approaches, such as arrayed waveguide gratings or ring resonators, face challenges like sensitivity to temperature, fabrication variations, and limited scalability in dense circuits. These issues can lead to wavelength drift and reduced signal fidelity, creating bottlenecks in high-speed optical networks. This novel architecture integrates Sagnac loop-based Fabry Perot cavities for compact, thermally stable, and fabrication-tolerant solutions that can handle multiple wavelength channels efficiently while maintaining performance. Applications:
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