Optical EngineeringFive-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
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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.