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Proceedings Paper

Si photonic crystal waveguide based delay lines
Author(s): Che-Yun Lin; Liang Zhu; Harish Subbaraman; Amir Hosseini; Alan X. Wang; Ray T. Chen
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Paper Abstract

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.

Paper Details

Date Published: 20 November 2012
PDF: 8 pages
Proc. SPIE 8564, Nanophotonics and Micro/Nano Optics, 85640P (20 November 2012); doi: 10.1117/12.2009132
Show Author Affiliations
Che-Yun Lin, The Univ. of Texas at Austin (United States)
Liang Zhu, The Univ. of Texas at Austin (United States)
Harish Subbaraman, Omega Optics, Inc. (United States)
Amir Hosseini, Omega Optics, Inc. (United States)
Alan X. Wang, Oregon State Univ. (United States)
Ray T. Chen, The Univ. of Texas at Austin (United States)
Omega Optics, Inc. (United States)

Published in SPIE Proceedings Vol. 8564:
Nanophotonics and Micro/Nano Optics
Zhiping Zhou; Kazumi Wada, Editor(s)

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