Polarization-insensitivity and rapid-calibration optical delay line on 3-μm-thick SOI photonics platform

Ang Li; Nengyang Zhao; Chenyang Liu; Yanyue Ding; Ruxue Wang; Chao Qiu; Aimin Wu

doi:10.1117/12.3040045

16 August 2024 Polarization-insensitivity and rapid-calibration optical delay line on 3-μm-thick SOI photonics platform

Ang Li, Nengyang Zhao, Chenyang Liu, Yanyue Ding, Ruxue Wang, Chao Qiu, Aimin Wu

Author Affiliations +

Proceedings Volume 13231, 4th International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2024); 132312K (2024) https://doi.org/10.1117/12.3040045
Event: 4th International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2024), 2024, Chongqing, China

Abstract

We design, fabricate, and characterize a polarization-insensitivity 8-bit optical tunable delay line (OTDL) on the 3-μm-thick silicon-on-insulator (SOI) platform, employing low-loss waveguide spirals and rapid-calibrated integrated optical switches. The spirals integrate mode converters and Euler bends, have high fabrication tolerance, low wavelength sensitivity, and propagation loss as low as 0.32 dB/cm within 140 nm bandwidth. The 4-cm-length waveguide spiral has polarization dependent loss (PDL) less than 0.3 dB within 140nm bandwidth. OTTDL utilizes optical switches with extinction ratio (ER) of up to 50 dB for path switching. The switch integrated multimode interferences (MMIs), thermo-optic phase shifter and variable optical attenuators (VOAs). VOAs not only enhance the delay signal-to-noise ratio, but also facilitate rapid calibration in OTDLs. With maximum delay time of 3570 ps and resolution of 14 ps, our OTDL holds significant promise for future applications, particularly in the integration of delay line arrays for microwave photon radar systems.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Ang Li, Nengyang Zhao, Chenyang Liu, Yanyue Ding, Ruxue Wang, Chao Qiu, and Aimin Wu "Polarization-insensitivity and rapid-calibration optical delay line on 3-μm-thick SOI photonics platform", Proc. SPIE 13231, 4th International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2024), 132312K (16 August 2024); https://doi.org/10.1117/12.3040045

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