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Optical Engineering

Five-bit substrate guided wave true-time delay module working up to 2.4 Thz with a packing density of 2.5 lines/cm2 for phased array antenna applications
Author(s): Zhenhai Fu; Ray T. Chen
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Paper Abstract

A 5-bit true-time delay module is demonstrated. The combination of a 1-to-4 fiber beamsplitter and four 1-to-8 collinear guided-wave fanouts provides us with the required 32 surface-normal fanout beams with a delay step of 50 ps. The system design, device fabrication, and optimization of the fanout intensity uniformity down to ±10% among 32 fanouts are addressed. The packing density of this device is 2.5 (delay lines)/cm2, which is the highest demonstrated thus far. A bandwidth of 2.4 THz is confirmed experimentally by employing a femtosecond laser and an ultrafast detector.

Paper Details

Date Published: 1 June 1998
PDF: 7 pages
Opt. Eng. 37(6) doi: 10.1117/1.601697
Published in: Optical Engineering Volume 37, Issue 6
Show Author Affiliations
Zhenhai Fu, Univ. of Texas/Austin (United States)
Ray T. Chen, Univ. of Texas/Austin (United States)

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