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This paper described the first results demonstrating the Super-Ring tuning concept applied to a 40 microresonator based TTD device, operating with the Balanced SCISSOR scheme. Tunable delay up to 515ps of a 20GHz BW RF photonic signal was shown, using only two drive voltages, with SFDR over 110dB.Hz2/3 for delays up to 300ps.
Commercially packaged optical true-time-delay devices were developed utilizing ultra-low loss silicon nitride microresonators, achieving record tunable delay of 535ps for a 20GHz wide signal, 632ps for a 10GHz wide signal, with tunable loss of 3dB.
We present results for a broad bandwidth continuously tunable optical delay line based on the balanced side-coupled integrated space sequence of resonators scheme. A tunable delay of up to 345 ps is obtained without distortion of the optical signal. Fast thermal switching speed under 10 is achieved without any measurable long-term transient by utilizing a novel balanced thermal tuning...
We show that 20 microresonators collectively behave as a single resonance and are controllable with a single voltage signal, thereby exploiting the inherent variability of microresonators enabling multi-ring Balanced SCISSOR devices with two drive signals.
Using the Balanced SCISSOR scheme, together with balanced thermal tuning, microresonator based silicon photonics devices were shown to provide a large tunable delay of 345ps, with broad bandwidth and low distortion. These practical devices will find many applications for use in phased array systems.
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