20 November 2012 Si photonic crystal waveguide based delay lines
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We report a four-channel on-chip true-time-delay (TTD) module based on a photonic crystal waveguide (PCW) array. By minimizing the coupling loss with a photonic crystal taper (PC taper), the delay lines with 1–3mm long PCWs can operate up to a group index ng~23 without significant loss. The large group velocity dispersion enables continuous and wavelength-tunable time delays. Measurements show a highly linear phase-frequency relation, highest time delay up to 216.7 ps, and large tuning ranges of 58.28 ps, 115.74 ps, and 194.16 ps for 1–3mm delay lines, respectively. The chip-scale TTD module can provide ±44.38° steering for an X-band phased array antenna (PAA), but occupies only 0.18 mm2 area.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Che-Yun Lin, Che-Yun Lin, Liang Zhu, Liang Zhu, Harish Subbaraman, Harish Subbaraman, Amir Hosseini, Amir Hosseini, Alan X. Wang, Alan X. Wang, Ray T. Chen, Ray T. Chen, } "Si photonic crystal waveguide based delay lines", Proc. SPIE 8564, Nanophotonics and Micro/Nano Optics, 85640P (20 November 2012); doi: 10.1117/12.2009132; https://doi.org/10.1117/12.2009132


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