Fabrication-Tolerant O-Band WDM Filter With Phase-Balanced Tapered Arms and Wavelength-Independent Couplers

• DOI: 10.1109/jlt.2023.3300875
• Publication Date: 2023-08-01T18:13:48Z
• Authors: Marios Papadovasi...; Sujith Chandran; Yonas Gebregiorgis; Yusheng Bian; Michal Rakowski; Abdelsalam Aboketaf; Rod Augur; Jaime Viegas
• Keywords: Waveguide; Free spectral range

We design, simulate, and experimentally demonstrate a coarse wavelength-division de-multiplexing system based on cascaded Mach-Zehnder interferometers (MZIs) operating in the O-band. The fabricated devices are built monolithic silicon photonics platform state-of-the-art CMOS foundry. fabrication tolerance of device was obtained by combination analytical 3D Finite-difference time-domain (FDTD) methods. Fabrication-tolerant wavelength-independent couplers were used order to achieve broadband splitting ratios (SRs) ensure stability along entire wavelength range. In addition, phase-balanced linear tapers allow for arbitrary waveguide width values MZIs. Experimental results show very high-performance across different wafer test sites with mean channel spectral shift only 1.03 nm total footprint 0.582 mm <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{2}$</tex-math></inline-formula> .