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Silicon nanomembrane based photonic crystal waveguide array for wavelength-tunable true-time-delay lines

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6 Author(s)
Che-Yun Lin ; The University of Texas at Austin, 10100 Burnet Rd, Bldg160 MER, Austin, Texas 78759, USA ; Subbaraman, H. ; Hosseini, A. ; Wang, A.X.
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We demonstrate a four-channel on-chip true-time-delay module based on a photonic crystal waveguide array. Using the photonic crystal taper to minimize the coupling loss, the delay lines with 1–3 mm long photonic crystal waveguides 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 1–3 mm delay lines. The chip-scale true-time-delay module occupies only 0.18 mm2 area and can provide ±44.38° steering for an X-band phased-array-antenna.

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Applied Physics Letters  (Volume:101 ,  Issue: 5 )